time travel machine simulator

Best Time Travel Games 2023

Who doesn't like a bit of time travel? We've created the ultimate list of the best time travel games to play right now. Find your next game here!

While time travel is traditionally featured in works of science fiction, nowadays, you can find elements of this mysterious phenomenon in just about every genre of gaming. 

It’s typically depicted in one of two ways: a plot device where characters must go back in time to prevent something from happening, or a game mechanic in which players manipulate time to overcome challenges.

In this list, we’ll showcase  the top time travel games to enjoy in 2024 , such as games about traveling through time and the finest time travel games for computer.

We’ll be updating this list in the future with new titles, so make sure to check back and let us know if we missed any of your favorite games involving time travel!

Related: Best Space Games 2023 Best Story-Driven Games 2023 Best Point and Click Adventure Games 2023

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Platforms: Windows, PS5

A common trend in more recent games is characters getting stuck in perpetual time loops and having to figure out a way to escape.

One of the more recent titles to explore this trope is Deathloop , an immersive sim shooter about a talented hitman who finds himself trapped in time on a party island with rival assassins.

To end the loop, you’ll have to eliminate the eight targets responsible for your serious case of déjà vu while also navigating the island’s numerous threats.

It’s a clever approach to open-ended gameplay that builds upon previous Arkane games such as Dishonored and only benefits from looking like an acid trip from the ‘70s.

The Forgotten City

Platforms: Windows, PS4, PS5, Xbox One, Xbox Series X/S, Nintendo Switch

Initially conceived as a Skyrim mod , The Forgotten City would eventually become a standalone game spearheaded by lead developer and writer Nick Pearce.

Set during an alternate version of the Roman Empire, it sees you exploring a city subjected to the Golden Rule: a religious mandate where any sinful action causes the entire population to turn into permanent gold statues.

While inspecting the rule’s origins and which transgressions it applies to, you’re advised someone in the city intends to violate it, urging you to travel back in time to prevent them.

It’s an interesting take on time travel that also explores the existential relationship between humanity and its laws, namely what is truly considered right or wrong.

Platform: PS5

Returnal is a PlayStation-exclusive third-person shooter about an astronaut who lands on an alien planet searching for a mysterious signal when she suddenly finds herself trapped in a time loop.

This is a great justification for the game’s roguelike design, which sees the protagonist resurrected after each death as she traverses the planet’s foreign environments and battles a host of extraterrestrial foes.

The further you progress, the stranger and more unsettling Selene’s visions become as she finds herself increasingly entangled in an ever-changing world.

If you manage to make it to the end and break the loop, you’ll be faced with some startling revelations about the main character and the planet that make for great sci-fi storytelling.

Platforms: Windows, PS5, Xbox Series X/S

Although time travel generally involves going forward or backward in history, you can extend this further to account for multiple realities or planes of existence.

With this mindset, one could argue that the horror game The Medium uses time travel as a game mechanic, with the main character able to travel between the spirit world and the living world.

In a practical sense, this allows you to make changes in either world that affects the other, such as unlocking doors to progress, obtaining a key item to solve a puzzle, or warding off hostile enemies.

The story follows psychic Marianne as she’s mysteriously summoned to an abandoned hotel where she’ll have to use her powers to unravel its history and help free the spirits trapped within its grounds.

Reminiscence

Platform: Windows

Reminiscence is a story-driven, psychological horror game that has you warping, jumping, and rewinding time and space in order to save your family.

In it, you play as a man living in a world that’s about to collapse into anarchy who suddenly discovers their wife and kids have mysteriously disappeared.

While searching your home for clues, you stumble upon a watch that lets you travel between two eras: the post-apocalyptic present, and 1950s American suburbia.

By switching back and forth between both realities, you’re able to alter the state of certain objects to solve puzzles and advance the story.

Inspired by sci-fi classics like Back to the Future, No Time sees you stealing a suspiciously familiar time machine vehicle from a secret facility before setting off on a time-traveling adventure.

Unlike many games in the genre which center on heavily scripted missions, the game functions as a time travel simulator with both story and sandbox elements.

As a result, you’re free to explore any date throughout history from 0-2030 AD while making sure not to destroy the current timeline by interfering as little as possible and avoiding your younger self.

The game also features a day/night cycle, various job minigames and side quests, crafting, and a combat system for dealing with pesky Time Agents. 

Outer Wilds

Platforms: Windows, PS4, Xbox One, Nintendo Switch

If you’re looking for an engaging and immersive time travel game about space exploration , look no further than Outer Wilds .

You take on the role of the newest recruit for Outer Wilds Ventures, a fledgling space program looking to expand its knowledge of the galaxy and its ancestors’ mysterious disappearance.

The narrative addresses various sci-fi clichés such as black holes, antimatter, and of course time travel, with your character confined in an everlasting 22-minute time loop.

This is complemented by a densely packed open world consisting of hand-crafted, explorable planets with interesting backstories and distinct hazards that can be tricky to navigate.

Twelve Minutes

Platforms: Windows, Xbox One, Xbox Series X/S

Twelve Minutes is an interactive thriller about a man having a romantic dinner with his wife when a mysterious man claiming to be a police detective shows up on his doorstep.

Things quickly escalate and eventually the man is killed, only to find himself transported to the beginning of the evening with his previous memories intact.

Confused and desperate, he sets out to break the time loop by searching the apartment for clues and interviewing each person involved.

While some of the game’s different endings get into weird, taboo territory, there are interesting puzzles and narrative threads to tug at that make the journey worthwhile, though we suggest following a guide.

Platforms: Windows, Mac

In the stealth puzzle adventure game Timelie , every second matters and can bring you one step closer to freedom or death.

The game has you taking on the role of a young woman with a special gift that lets her control the flow of time as if it were a media player, rewinding and fast-forwarding to gain new insights. 

Harnessing this power allows her to manipulate obstacles in her path and avoid detection from robot patrols preventing her from leaving.

The story is quite compelling and the time travel mechanics are explored in some truly fascinating ways that become more complex the further you go.

The Gardens Between

Platforms: Windows, PS4, Xbox One, Nintendo Switch, Linux, Mac, iOS

The Gardens Between is an indie puzzle game created by The Voxel Agents that has you manipulating time 20 abstract, narrative-driven levels.

The game is unique in that you don’t control the main characters directly but rather move them backward and forwards through time while altering the state of different objects to progress.

Each level reveals more about the relationship between the two main characters, Arian and Frendt, chronicling the evolution of their friendship leading up to a life-changing event.

While it’s a short-lived experience, clocking in around 2.5 hours, The Gardens Between tells a compelling story and explores time travel mechanics in some fun and interesting ways.

Timespinner

Platforms: Windows, PS4, Xbox One, Nintendo Switch, Linux, Mac

Inspired by ‘90s action-platformers, Timespinner is a story-driven Metroidvania about a magical timekeeper named Lunais who seeks out revenge after her family is murdered by an evil empire.

Her quest for justice brings her to a mysterious and hostile world where she’ll have no choice but to wield her time manipulation power to defend herself and rewrite history.

The game has you exploring beautiful, atmospheric pixel art environments while switching between the past and present as you defeat enemies and acquire new powers.

Mastering Lunais’ time-manipulating abilities open up new possibilities for combat, which is further complemented by familiars that can be trained to fight on your side.

Life Is Strange

Platforms: Windows, PS4, Xbox One, Nintendo Switch, Linux, Mac, iOS, Android

A standout adventure title from Dontnod Studios and published by Square Enix, Life is Strange follows 18-year old aspiring photographer Max Caulfield as she comes to terms with her newfound powers.

Max has a supernatural ability that lets her move backward or forwards through time to alter the state of objects and their effect on the people around her.

Its applications vary depending on the scenario, allowing Max to mend relationships with her friends and family, solve bigger mysteries, and get revenge against the occasional bully.

Even if the gameplay aspect falls flat at times, the way time travel is introduced and incorporated into the structure of the story makes up for it.

Quantum Break

Platforms: Windows, Xbox One

Quantum Break is a cinematic action game from Remedy Games, best known for titles like Control and Alan Wake, and Max Payne.

In it, you take on the role of Jack Joyce, a man on a mission to prevent his timeline from ending by harnessing an array of unique time-based powers.

The story doubles as a live-action television series with certain events explained in further detail, which can require a bit more of a commitment than your average game.

With that said, Quantum Break is one of the best-looking time travel games in terms of graphical fidelity, boasting cool mind-bending camera tricks and special effects that still look great in 2024.

Platforms: Windows, PS4, Xbox One, Nintendo Switch, Mac

Superhot  sets itself apart from more traditional  FPS games  by introducing one clever mechanic: time only moves forward when you do.

This grants the player ample time to assess threats and determine the best course of action before setting it in motion with stylish shootouts and melee showdowns.

To ensure combat is always readable, the game employs a minimalist art style that does a great job at conveying info: enemies are always red, environments are white, and weapons are black.

While it’s best enjoyed in VR with full immersion, you’ll still have a lot of fun playing with a gamepad controller or just mouse and keyboard. 

Titanfall 2

Platforms: Windows, PS4, Xbox One

The follow-up to Respawn’s criminally underrated  first-person shooter  features refined gunplay and fluid movement with a touch of time travel.

During Titanfall 2 ’s campaign, your character obtains a special wrist-mounted device that lets them swap back and forth between the past and present.  

This is helpful for exploring deteriorating buildings, avoiding clusters of foes, and solving nature-based challenges as pilot Jack Cooper.

Combine this with exciting parkour-based platforming and an arsenal of satisfyingly powerful weaponry and it’s easy to see why Titanfall fans want to see the series return.

BioShock Infinite

Time travel in the BioShock series is presented as a plot device in which certain characters, namely Elizabeth and the Lutece twins, can create dimensional time-alternating portals called Tears.

To that point, the game’s take on parallel universes and how they affect the overarching story can be boiled down to a single quote: “There’s always a lighthouse, there’s always a man, there’s always a city.”

BioShock Infinite sees you venturing into a floating steampunk city called Columbia where citizens still cling to violent religious and racist beliefs.

In order to make sense of the series’ extensive timeline, consider playing through the first two games in the series or watching a recap video before starting Infinite. 

Platforms: Windows, PS4, PS5, Xbox One, Xbox Series X/S, Nintendo Switch, Linux, Mac

Our final recommendation is Braid , a beloved indie puzzle platformer that comes from the mind of The Witness designer Jonathan Blow.

In it, you take on the role of a man named Tim as he attempts to rescue a princess from an evil monster using time manipulation.

If that description didn’t make it obvious enough, the game’s story is meant to critique popular trends in modern video games but also features some excellent time travel puzzles.

Levels cover everything from rewinding and fast-forwarding time, altering the state of certain objects, using your character’s movement to determine the flow of time, and much more we don’t wish to spoil.

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Samuel is GamingScan's editor-in-chief. He describes himself as a dedicated gamer and programmer. He enjoys helping others discover the joys of gaming. Samuel closely follows the latest trends in the gaming industry in order to keep the visitors in the flow.

Project TimeTravel

A virtual reality history and literature simulation.

Best time travel games

Here's our list of the best time travel games with more timeloops and grandfather paradoxes than you can shake a stick at.

Looking for the best time travel games? These 10 entries mark the highlights of a genre that has been going strong for decades – promising the awe of hurtling forward in time, manipulating the present, or changing what’s happened in the past. Haven’t we all wanted to do that at some point?

Is time travel possible? Well, time travel is a pretty recognizable concept by now and has been around for as long as there have been people, whether in Hindu mythology or Japanese fairy tales. The idea of time travel in pop science fiction was widely popularized by H.G. Wells, who wrote the 1895 novel The Time Machine, as well as other stories that saw protagonists propelled into different eras.

While many modern games utilize some kind of repeating loop, like Hades or Loop Hero, the best time travel games take this a step further – allowing the player to distort time for their own ends, or forcing them to adapt to imprisonment within it.

These games don’t just use time travel as a story hook, but an integral part of how the game works – which is what helps them stand out among the bog-standard shooters, puzzle games, and platformers out there. 

So, if you loved watching the likes of Groundhog Day or Russian Doll , then these are the games for you. Who knows, maybe one of these titles will end up on our (or even your) space video games that should be movies or TV shows list. While you’re at it, make sure to check out our guide to the best time travel movies too, or if you’re after more games then these upcoming space games will interest you. 

10. Deathloop

• Release date: September 14, 2021
• Platform: PlayStation 5, PC, Xbox Series X/S

Possibly the best PS5 exclusive to have released on the console at the time (though it has since released on Xbox too), Deathloop is a thrilling time-travel first-person shooter (FPS) romp from the developers behind Dishonored.

You play as Colt, an assassin, who is on a mission to eliminate eight ultra-powerful individuals. These gifted beings are exploiting a time loop machine on a subarctic island to live the same day over and over, essentially becoming immortal and being able to do whatever they desire every night without consequence.

You must take out all eight to stop the loop from restarting – using what you learn across multiple loops to navigate the island and complete your mission in one perfect run. With slick gunplay, a gripping story, and a fascinating sci-fi premise, we don’t recommend you sleep on this one.

9. Twelve Minutes

• Release date: August 19, 2021
• Platform: Xbox One, PlayStation 4, Nintendo Switch, PC

It’s a fun, curious mystery game, with plenty of satisfaction to be had from toying with the objects and locations in your compact apartment to see how it’ll affect the outcome.

A curious time loop game, mostly in the star talent brought in to voice its trio of main characters: Daisy Ridley (Star Wars: Rise of Skywalker), James McAvoy (X-Men: First Class, Trance), and Willem Dafoe (Spider-Man, The Lighthouse).

The action takes place in a small, one-bedroom apartment, where McAvoy’s protagonist comes home to find a number of surprises waiting for him – one of which is an armed assailant claiming to be a police officer pounding on their door. When you’re knocked unconscious, you begin the time loop again and have to figure out what’s really going on in order to escape the loop for good.

8. Titanfall 2

• Release date: October 28, 2016
• Platform: Xbox One, PlayStation 4, PC

The sequel to Respawn’s futuristic mecha-combat FPS is a thrilling ride. It has a single-player campaign that pivots effortlessly between fascinating game mechanics, never feeling a need to dwell too long on each one.

The time travel mission, ‘Effect and Cause,’ is a real standout. It allows you to shift between the past and present mid-air as you run, shoot, and platform your way across an expansive military facility. Paired with Respawn’s excellent gunplay, this acclaimed shooter offers far more imagination than the average Call of Duty game.

The brisk campaign has plenty of other thrills to recommend it, but its seamless utilization of time travel as an integral game mechanic – even while limited to a single level – makes it well worth inclusion in this list.

7. Outer Wilds

• Release date: May 28, 2019
• Platform: Xbox One, PlayStation 4/5, Nintendo Switch, PC

Another time loop game, you say? Outer Wilds is a standout indie game, so much so that it’s made our best space games list. It sees you scour a solar system to unpack its mysteries, over a series of 22-minute time loops that reset your progress just as the nearest sun explodes into a supernova. Phew.

As with Deathloop, you’ll have to do more than simply map out the game – needing to learn when certain events occur, or which actions are available in the orbits of the solar system’s planetary bodies. Starting out as a student project, Outer Wilds has gone on to be one of the best indie games in recent years, with a heady mix of environmental exploration, galactic mystery, and survival sim all in one.

6. The Legend of Zelda: Ocarina of Time

• Release date: November 21, 1998
• Platform: Nintendo 64, GameCube, Wii, Wii U, Nintendo Switch

The best game of all time? It’s hard to argue with this assessment for The Legend of Zelda: Ocarina of Time (OoT), a landmark 3D action-adventure game that launched on the Nintendo 64 in 1998. In it, the young hero Link finds a magical ocarina which is able to change the weather, transport him across distant lands, and even propel him through time to a post-apocalyptic world.

It’s not a one-way trip, thankfully, and much of the puzzle work in OoT is in traveling back and forth between time periods, using what you learn and obtain to progress in each setting. As ever, you’re fighting a great evil, battling monsters, gathering weapons and tools for your journey, and figuring out troublesome dungeons – but time travel is what elevates Ocarina of Time into a game of truly mythical proportions.

It's an oldie, but a goodie. You can find the game through Nintendo Switch Online, or on Nintendo DS systems.

5. Quantum Break

• Release date: April 5, 2016
• Platform: Xbox One, PC

Back in 2016 when Quantum Break released, it was the best-selling game published by Microsoft on the Xbox One. While it soon ceded that title to Sea of Thieves (who needs time travel when you have sea shanties?) it’s still a landmark game, and a fascinating experiment in interactive storytelling.

The main conceit of Quantum Break is its mix of gameplay with an interactive TV show that breaks up the story’s five acts, allowing you to make key decisions that affect the narrative for the rest of the game.

Originally conceived as a sequel to Alan Wake, before pivoting into a new IP, Quantum Break is set in a world where a failed time travel experiment allows you to halt, freeze, accelerate, and generally manipulate time around you – inevitably used to ramp up combat as you take on hordes of soldiers and try to fix a fracture in time itself. Time ‘stutters’ can also freeze objects in your environment, creating obstacles or platforms that help and hinder your progress along the way.

4. Life is Strange

• Release date: January 20, 2015
• Platform: Xbox One, PlayStation 4, Nintendo Switch, PC, Android

While more recent Life is Strange games play around with the powers of empathy, or telekinesis, the original game is what started the franchise off with such aplomb – following the fortunes of a young girl who is able to rewind time.

Maxine ‘Max’ Caulfield discovers her time-manipulation ability when a classmate faces an unexpected danger – managing to undo the day’s events and keep them alive. As ever, time travel has unintended consequences, and while Max can aid or even save various people in her life, she finds the outcome isn’t always for the best in the long term. 

With a strikingly impressionistic art style, branching narratives, surprisingly high stakes for a high school story, and a good helping of teen angst, this episodic adventure is well worth a try.

3. Wanderer

• Release date: January 27, 2022
• Platform: PlayStation VR, SteamVR, Oculus

If you’re looking for a time-travel VR game, you’ve come to the right place. Wanderer is a first-person puzzle adventure that has you traveling back through time to prevent an apocalyptic present.

With a talking watch on your wrist, and the ability to jump to different places and periods, Wanderer lives up to its name, seeing you jettison across centuries of history and even to the moon. In each case, action is found in localized puzzles (escape rooms, essentially), some of which take imaginative back-and-forth travel to get the right objects for the right situation. 

You’ll get around 10 hours of play out of this one, along with some brain-bending puzzles that make the most of the VR medium (along with one of the best VR headsets )

• Release date: August 6, 2008
• Platform: Xbox 360, PlayStation 3, Switch, PC, Mac, Linux

Few games play so successfully with time as Braid, a 2008 indie platformer initially launched on Xbox 360 to great acclaim. The developer went on to create The Witness with the profits from this game.

You play Tim, who is trying to find and rescue a princess from some unspecified monster. So far, so Mario. However, things aren’t quite so simple as running and jumping on Goombas: Braid utilizes a number of different time-based mechanics, from a simple rewind (helpful after jumping and missing a ledge) to whole levels that move forward in time as you move right and backward as you move left.

It’s a mind-melting game in many ways, and you may find the story elusive at first, it being gradually pieced together by jigsaw pieces you collect throughout your journey – and blown open by its subversive conclusion. But a recurring theme is the idea of wanting to redo or undo the past, and you won’t find a game that needles this idea as effectively or imaginatively as Braid.

1. The Legend of Zelda: Majora's Mask

• Release date: April 27, 2000
• Platform: Nintendo 64, GameCube, Wii, Wii U, Nintendo Switch, Nintendo DS

How could we list the best time travel games without Majora’s Mask? This follow-up to Ocarina of Time takes place in the same land of Hyrule as its predecessor just two months later, even re-using many in-game assets. The key difference is that an unhinged-looking moon going to crash into the Earth, obliterating everything – and you find yourself reliving the same three days over and over in an attempt to prevent the cataclysmic event from happening.

Those three days come to around an hour of actual gameplay time, meaning you play through a loop quite swiftly, but the real magic of Majora’s Mask is in how it expands on the time-warping magic of OoT. Here you’ll use the ocarina to jump back to the start of the loop, slow down the passage of time, or jump forward to a later day, navigating time like a puzzle dungeon in need of solving.

Earning widespread acclaim, Majora’s Mask has been rereleased several times throughout the years. For modern gamers, you can find the game through Nintendo Switch Online, or on Nintendo DS systems.

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TIME TRAVEL MACHINE SIMULATOR is a driving game with many different vehicles.

You will have the chance to choose from a number of different cars. All of them will be available for free.

The gameplay is simple. You will only have to drive, park and play. But it will not be that easy, because the levels will get more and more difficult as you go on.

There will be many different tasks and objectives to complete.

At the end of each level, you will get to the next one.

If you get stuck, then just try to complete the level again.

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Universe simulator

SpaceEngine is a realistic virtual Universe you can explore on your computer. You can travel from star to star, from galaxy to galaxy, landing on any planet, moon, or asteroid with the ability to explore its alien landscape. You can alter the speed of time and observe any celestial phenomena you please. All transitions are completely seamless, and this virtual universe has a size of billions of light-years across and contains trillions upon trillions of planetary systems. The procedural generation is based on real scientific knowledge, so SpaceEngine depicts the universe the way it is thought to be by modern science. Real celestial objects are also present if you want to visit them, including the planets and moons of our Solar system, thousands of nearby stars with newly discovered exoplanets, and thousands of galaxies that are currently known.

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All types of celestial objects

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Galaxies, nebulae, stars and star clusters, planets and moons, comets and asteroids

Thousands of known

celestial objects

Known galaxies, stars, planets, asteroids, nebulae are represented using catalogs: HIPPARCOS, NGC/IC, Messier, MPC, NASA Exoplanet Archive and many others

procedural generation

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Uncharted regions of space feature procedurally generated objects: galaxies, stars, star clusters, nebulae and planetary systems

Incredibly huge

and realistic Universe

Trillions of galaxies with billions of star systems in each, everything is realistically scaled

free to move

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Seamless transition from the surface of a planet to the most distant galaxies, and free game-like movement with the WASD keys

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Click on any visible object with the mouse and hit the 'G' key to fly directly to it. Search for objects by name, search by parameters within a certain radius, browse an interactive map of the surrounding space and view a map of the current planetary system

Save locations

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Save a favorite point in space and time and share it with friend. Give a name to any discovered planet, star or galaxy, and write a description for it.

Observe the Universe

Accelerate, decelerate, or reverse the flow of time to see the orbital motion of planets and moons, and watch sunsets and eclipses

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how the Universe works

Read detailed physical and astronomical data of any celestial body using the built-in Wiki system. Look at the orbital path lines of planets and moons, and compare their size side-by-side

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Justin Smith-Ruiu

A New Time-Travel App, Reviewed

We all know by now that the time-reversal invariance governing statistical mechanics at the microlevel maps by a simple equation onto the macroworld, making “time travel” a wholly unsurprising possibility … but damn! The first time you go back there’s just nothing like it.

I know all these first-person accounts of ChronoSwooping have become a cliché here on Substack, where, let’s face it, anyone can write pretty much whatever they want no matter how self-indulgent and derivative. Nonetheless I think I have some unusual insights to share, which derive from my own experience but which may offer some general lessons as to the nature and significance of time travel, both the original and long-prohibited “body-transit” method as well as the newer and more streamlined ChronoSwoop.

This is not only because I spent some years in the archives of the Stadzbybliotiēka of the Margravate of East K****, poring over the notebooks in which Quast first landed on the Quast equation, while in parallel jotting down sundry philosophical reflexions about the nature of Divine Tempus—as he called it—that have largely been neglected by other researchers. It is also because I have used the ChronoSwoop app in ways that are expressly prohibited by its makers, and indeed by the federal government. In light of this, while I am writing this product review for Substack and in the emerging “Substack style,” until the law changes or I depart permanently from the chronological present, I will be posting this piece only on the Hinternet-based Substack oglinda (Romanian for “looking-glass,” a hacking neologism supposedly coined by Guccifer 3.0), which I’m told is undetectable, remaining entirely unknown even to the original company’s founders. Fingers crossed.

Perhaps some readers on this oglinda will appreciate a brief summary of what’s been happening in the world of time travel since Quast first came up with his equation in 1962. I don’t know what sort of information has been circulating down here, and I don’t want anyone to feel left behind.

The early 1960s witnessed great leaps forward not just in time-travel technology, but in the technology of teletransportation as well—which is to say dematerialization of the body, and its rematerialization elsewhere, but without any measurable “metachrony.” By late 1966 poorly regulated teletransporters had begun to pop up on the state fair circuit, tempting daredevils into ever more foolish stunts. But this practice was curtailed already the following year, when, expecting to reappear kneeling before his sweetheart Deb at the stables with a ring in his hand, Roy Bouwsma, aka “the Omaha Kid,” got rematerialized instead with the stable door cutting directly through the center of his body from groin to skull—one half of him flopping down at Deb’s feet, the other half falling, like some neat bodily cross section carefully made for students of anatomy, into the stable with Deb’s confused horse Clem.

But while this atrocious moment, broadcast live on KMTV, nipped the new craze in the bud, the technology underlying it had already been adapted for use in what was then called “Tempus-Gliding,” which had the merely apparent advantage of concealing from those in the present any potential accident in the rematerialization of the voyager to the past. Of course, accidents continued to happen, and news of them eventually made its way back from past to present, bringing about all sorts of familiar paradoxes in the spacetime continuum. Tempus-Gliding, like any metachronic technology relying on body-transit, was a door thrown wide open to all the crazy scenarios we know from the time-travel tropes in science fiction going back at least to H. G. Wells: adults returning to the past and meeting themselves as children, meeting their parents before they were even born, causing themselves never to have been born and so suddenly to vanish, and so on. By the end of the 1960s people, and sometimes entire families, entire lineages, were vanishing as a daily occurrence (just recall the 1969 Harris family reunion in Provo!). You could almost never say exactly why, since the traveler to the past who would unwittingly wipe out all his descendants often had yet, in the present, ever to even try Tempus-Gliding.

By Kim Zetter

By Nena Farrell

By Will Knight

By Julian Chokkattu

A campaign to end the practice quickly gained speed. By 1973 the “Don’t Mess With Spacetime” bumper stickers were everywhere, and by the following year Tempus-Gliding was outlawed—which is to say, as is always the case in such matters, that only outlaws continued to Tempus-Glide. Scattered disappearances continued, public outcry against illicit Tempus-Gliding became more widespread. In 1983 Nancy Reagan made an unforgettable guest appearance on Diff’rent Strokes to help get out the message about the dangers of illegal body-transit. (“More than 40,000 young lives are lost each year to illegal Metachron gangs.” “What you talkin’ ’bout Mrs. Reagan?”) By the late 1980s a combination of tough-on-crime measures and transformations in youth culture largely ended the practice, and time travel would likely have remained as dormant as moon-travel if it had not in the last decade been so smoothly integrated into our new mobile technologies, and in a way that overcomes the paradoxes and inconveniences of Tempus-Gliding. It does so, namely, by taking the body out of the trip altogether.

This is the mode of time travel, of course, that has shaped a significant subcurrent of science fiction scenarios, notably Chris Marker’s La Jetée (1962), later adapted into the better known Bruce Willis vehicle 12 Monkeys (1995). While these films might seem exceptional, they also share something important with the great majority of what may be called time-travel tales avant la lettre, in which, typically, a man such as Rip Van Winkle goes to sleep for a very long time and wakes up in “the future.” The “zero form” of time travel, we are reminded, is simply to live, which is to say to travel forward in time at a slow and steady rate that only appears to be sped up or “warped” through deep sleep.

Be that as it may, when the new app-based time-travel technologies began to emerge in the late 2010s—relying as they did on a loophole in the 1974 law against time travel that defined it strictly as “metachronic body-transit”—they were all confronted by the hard limit on innovation already predicted by Quast, who remained committed until the end to the impossibility in principle of future-directed time-travel. “If you want to get to the future, you’re just going to have to wait,” Quast wrote in an entry in his Hefte dated 6 October, 1959 (SB-1omk 21.237). “To live in time is already to travel in time. So be patient” [ In der Zeit zu leben, das ist schon in der Zeit zu reisen. Hab also Geduld ]. Rumors of future-transit apps downloadable from ultra-sketchy oglindas have been circulating for years, but I’ve never seen any, and having studied Quast’s work I have come to believe that they are a theoretical impossibility.

The earliest apps, popping up mostly from anonymous sources, were mostly perceived as too dangerous and illicit to gain widespread appeal. “We’ve got that legal cannabis here in California now,” Whoopi Goldberg said on an episode of The View in September 2019. “If I want to take a little trip, I’m sorry but there’s edibles for that. I’m not messing with spacetime [ audience laughter ].” In an echo of the panic leading to the prohibition of Tempus-Gliding in the early 1970s, the government began to issue PSAs sensitizing the public to the serious psychological trauma that a return to our own pasts can trigger. “This is not lighthearted fun,” the messaging went. “Metachronism can ruin your life.”

The campaign against these new technologies would probably have killed them, or at least pushed them so far down into the oglindas as to occlude them from the public’s consciousness, if in 2021, at the worst moment of the pandemic, the ChronoSwoop company had not appeared as if out of nowhere and dropped its addictive new app with its signature “Swoop left/Swoop right” functions. Key to ChronoSwoop’s success was the discovery that users will draw significantly more pleasure from being cast into random moments in the past (Swoop left) than from being permitted to choose particular moments they have deemed significant in the post-hoc construction of their autobiographical self-narrative. And if you find yourself thrown back into an unpleasant or dull moment, then a single swift Swoop right will bring you immediately back into the present. You can of course go into your settings and laboriously reconfigure the app to permit you to choose your precise dates, but the great miracle of ChronoSwoop’s success is that almost no one bothers to do this. The people want their time travel to come with streamlined, easy interfaces. They want to move through the past like they move through their feeds: going nowhere in particular, with no clear purpose.

Quast had remained agnostic as to the possibility of body-less time travel, though he always insisted that, if it turns out to be possible, this will amount to an empirical proof of body-soul dualism. If the “self” can easily be inserted into the body it possessed at an earlier stage of life, while retaining all the memories of experiences from after that stage, this means, he believed, that the memories, as well as consciousness itself, cannot be dependent on the physical substrate of the brain that supposedly hosts them. When people first started ChronoSwooping, there were rumors of “headaches,” which were supposed to have resulted from the transit back in time of the more fully developed neurological structure of the time traveler—essentially cramming, say, a 38-year-old’s brain into the cranium of his 10-year-old past self. But of course no such thing occurs, for what travels back, as Quast predicted, is the immaterial self alone, and the fact that this is possible does indeed demonstrate, whether the scientific establishment is ready to admit it or not, that we do not need to remain anchored to any parcel of matter at all in order to exist as conscious beings.

ChronoSwoop beat out its early competitors (remember TimeDig? 😂) not only by getting rid of the date-choosing option, but also by adding sensorimotor control to the package. The earliest apps only planted your consciousness into the body of your past self and permitted you to “ride along,” to see and feel everything your former self saw and felt, but not to exercise any control over any of this. Quast predicted that only such passive riding would ever be possible, in part because any will-driven intervention in the sequence of past events, such as ChronoSwooping now makes possible, seems to generate at least as many paradoxes for the spacetime continuum as old-fashioned body-transit.

It’s not clear how ChronoSwoop managed to pull it off, but we can at least affirm what the emerging scientific consensus says about this new option, namely that it demonstrates the truth of the so-called “Many Worlds” interpretation of quantum mechanics, where each new timeline created by a different course of action initiated by a time traveler through the vehicle of that traveler’s own former self simply places that self on a different timeline of a different world, of which there are in any case infinitely many. These worlds are all self-contained and non-interacting, unless you can call ChronoSwooping itself a form of interaction, so that, however strange it all is, we at least avoid the more awkward conundra of body-transit, as when, for the millionth time, some idiot gets it into his head to “kill baby Hitler,” which of course means that more or less everyone in the world from roughly 1933 on, being affected by different events of the world, also ends up having sex at different times, different spermatozoa end up fecundating different eggs, and virtually all of us children of the 20th century disappear, until someone else arranges to kill the idiot who killed baby Hitler and set us back on our course again.

As an early adopter, I first ChronoSwooped in November 2021. The particular experience might seem unremarkable when I describe it, but for me, beyond being an occasion to see my deceased father again, it was my initiation into a world from which I have not really returned. I ended up, at random, back in December 2003. It’s Christmastime, and I’m visiting with my dad in Little Rock, where, I quickly recall, he has recently relocated after some career difficulties in the wake of the dotcom crash. “Have you seen this guy called Crazy Frog?” he’s asking me, as we stand in front of his desktop. “He’s kind of dumb but he makes me laugh.” I look at the animated amphibian with the aviator glasses, singing his ringtone melody over a techno remix of Herbie Hancock’s “Rockit.” I had forgotten all about this. How many other fragments of lost culture, I wonder, lie dormant in me at every moment? Crazy Frog jumps on an invisible motorcycle and revs it along a Möbius-strip highway. “I like it,” my dad says, smiling childlike. I am filled suddenly with infinite love for him. I can’t bear it, and I Swoop right.

I go back again and ChronoSwoop tells me it’s June 21, 1998. I’m sitting on a barstool in a place I seem to remember, but only vaguely. I can tell immediately that it’s very late at night, and that the version of me I have just Swooped into was feeling considerable stress just seconds before. I don’t share his precise memories, or, rather, what happened for him just a moment ago is at a 24-year remove for me, but his cortisol levels are mine now too, and I can tell something’s wrong. After a minute or so my ex-girlfriend S**** bursts out of the men’s room, followed by some miserable low-life wearing a T-shirt with a dumb neon alien’s head on it. He wanders off and she comes sheepishly to me. “We were only doing lines, I swear.” She sniffs and rubs her nose. I am suddenly filled with rage. What a miserable time of my life this was, I think, and again I Swoop right.

I took a break for the next three days, believing I had already had enough. I found myself not quite traumatized, but far more melancholic than I usually am, and largely convinced that what the PSAs were saying was true. This is not lighthearted fun. And yet, for some reason, I went back. I landed this time on February 11, 1979. It’s morning, and I’m on the playground of my Montessori school with Jeremy. He’s wearing an Oakland Raiders windbreaker and has mushroom hair like Nicholas from Eight Is Enough. He’s holding his thumb up to his mouth like it’s a microphone and his hand over his ear as if he has a headset. “This is Howard Cosell,” he says in a funny voice—a “Howard Cosell” voice. I am staring at him confusedly. He sees that I’m not laughing at his imitation. Something in my face frightens him, and he begins to cry. I Swoop right.

What was that all about? Jeremy was always a crybaby, but not like this. What did he see in my face that frightened him so? I drink a Nespresso and I think about what to do next. Maybe I’ve had enough already? No, I Swoop left, and it’s August 18, 1975. I’ve just had a shower and I’m in my long red nightshirt. It’s a summer evening in Rio Linda, the windows are open, and the frogs and bugs are croaking and chirping. I’m lying on the couch, and Mom’s cutting my toenails. I have the strong sense that this entire composition and every being involved in it—the frogs, the bugs, Mom, the sun—is in fact only one being; or more precisely, that it is only one being, and that being is me . This is what life used to be like! Before what? Before things came apart. That’s what it is to grow up: to see the world come apart. It’s too much for me. I Swoop right.

I resolve to end my explorations here, and a good two weeks go by before I find myself quite unconsciously, lying on my back on the couch, moving through the well-hidden settings in my app. I click on “Set Target Date” and immediately I am taken to a screen requiring me to upload a scan of a state-issued ID, which will then confirm my date of birth and prevent me from choosing any target date preceding that all-important threshold. Once this formality has been handled, I aim it back to November 19, 1972, and I set the visit duration for just 30 seconds. (I presume that if I am not yet four months old, even if I have some sensorimotor control over my body as well as my usual 49-year old consciousness about me, I still might simply lack the coordination to Swoop right.) It’s hard to say what I experience when I arrive. It’s warm, it’s light, and all is one. I’m lying there next to a funny man who’s watching something on TV, but I don’t know it’s a TV, and the sound of laughter is coming out of it. “PB&J with pickles,” the man says, repeating what he has heard, laughing. Somehow I don’t understand what this means, but I’m thrilled that he finds it so funny. “Did you hear that one? PB&J with pickles !” he shouts to someone who is not in the room with us, but whose presence I can feel. Such joy. Such love. I disappear.

The block on pre-birth travel is ostensibly to prevent the risk of “ditching,” where someone gets permanently stuck in the past. But as long as we are able to preset the duration of the visit, this concern seems ill-placed, and we can only imagine that the real reason is the one that Quast foresaw: “If it ever becomes possible experimentally to prove the immateriality of the soul,” he wrote, “they will do everything in their power to prevent us from finding out about it” (SB-1omk 24.785).

I’m not the sort of person to break the law casually, but what I experienced in the autumn of 1972 was simply too powerful, and I wanted more. I went to the Pakistani mobile-phone shop down at the corner, and sure enough, what they always say about these places is true. Just as the agile shopkeeper will happily oblige any request to repair your touchscreen or to unblock some old battered phone, no questions asked, neither will he look surprised when you ask him, as the parlance has it, to “take away your birthday.”

When I got back home I drank a Diet Dr. Pepper and I pondered different dates and durations until one came to me as if in a message: 1 minute, July 30, 1971—exactly a year before my birth. I Swooped left. I cannot tell you how or why this is so, but I can tell you that exactly a year before I was born, I was floating in warm liquid, and although I had no eyes to see it, I can tell you that there was light. This scene too was charged up with love.

It was also, somehow, charged up with knowledge. Though I did not “know” anything—about PB&J sandwiches, for example, or about parents, or Howard Cosell, or Crazy Frog—it seemed to me after my return that this is only because I knew everything, and I knew it from a vantage where the sharp differentiation between these sundry things seemed a far greater error than their combination. Seeing them all as one, it seemed to me now, felt unmistakably like what is imagined under the idea of heaven. St. Augustine writes that in death the soul returns to regionem suae originis —to the region of its origin, and here he is adapting within a Christian context the broadly Platonic vision of a pre-life life spent in direct communion with the eternal and unchanging Forms. Is that what I was seeing in 1971? If so, then why was everything so wet? No Platonic philosopher, Christian or heathen, ever conceived “baby heaven” in precisely this way.

You probably have some idea of what I did next. I scrolled back to the earliest transit date possible—January 1, 1900. I would have gone back far earlier, to 500 BCE, to 50 million ybp, to God knows when, but the drop-down calendar made its cutoff the beginning of the 20th century. So that’s where I went; nor did I set a duration for the visit.

I can’t tell you what happened after that, or whether I’m still there, or what is even happening anymore. If you think I’ve been spending my days watching mustachioed men on velocipedes going to the beach and changing there into comical striped one-piece bathing suits to play beach-croquet with ladies in bloomers, you really haven’t understood what pre-birth ChronoSwooping is like. I set the thing for 1900, but the human calendar doesn’t mean very much when you’ve shed your body, and your senses, and any trace of your connection to the world of particulars.

I would not recommend doing what I have done. It is not a question of being able “to handle it”; we “handle” whatever comes our way, even or perhaps especially the most impossible things. Unlike the world I saw in 1971, here it’s not even wet or light, but neither is it dry or dark. I know everything, if by “everything” we mean the timeless and universal truths, but as for individuals, facts, things that come and go, contingent beings and the ever-vanishing traces of events, I just can’t make anything out anymore.

“God made time to prevent everything from happening at once,” the diminutive Billy ponders, while looking up at the bright North Star like some junior magus in a Family Circus cartoon circa 1988 that somehow remains vivid to me in its particularity, like the answer to a riddle I never meant to pose, even as almost all other particulars recede from my consciousness. This too is a cliché, of course. Albert Einstein said something similar; so did many other people in fact, and they were all drawing broadly on a theory of temporal idealism that runs through many philosophical systems, including, on at least one understanding, that of Augustine. But no matter, it’s Bil Keane’s cartoon version that sticks with me. I love the Sunday funnies: so stupid; so comforting; so warm. I love TV. I love memes. They’re kind of dumb but I love them.

On these and other such small things was I trained up, like some innocent AI that knows no temporal flow at all, so that the dim outlines of them still move across memory’s stage even after I have used my app against the rules and withdrawn from Time altogether—before Time was yet able to withdraw from me.

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Time Travel Simulation Resolves “Grandfather Paradox”

What would happen to you if you went back in time and killed your grandfather? A model using photons reveals that quantum mechanics can solve the quandary—and even foil quantum cryptography

By Lee Billings

On June 28, 2009, the world-famous physicist Stephen Hawking threw a party at the University of Cambridge, complete with balloons, hors d'oeuvres and iced champagne. Everyone was invited but no one showed up. Hawking had expected as much, because he only sent out invitations after his party had concluded. It was, he said, "a welcome reception for future time travelers," a tongue-in-cheek experiment to reinforce his 1992 conjecture that travel into the past is effectively impossible.

But Hawking may be on the wrong side of history. Recent experiments offer tentative support for time travel's feasibility—at least from a mathematical perspective. The study cuts to the core of our understanding of the universe, and the resolution of the possibility of time travel, far from being a topic worthy only of science fiction, would have profound implications for fundamental physics as well as for practical applications such as quantum cryptography and computing.

Closed timelike curves The source of time travel speculation lies in the fact that our best physical theories seem to contain no prohibitions on traveling backward through time. The feat should be possible based on Einstein's theory of general relativity, which describes gravity as the warping of spacetime by energy and matter. An extremely powerful gravitational field, such as that produced by a spinning black hole, could in principle profoundly warp the fabric of existence so that spacetime bends back on itself. This would create a "closed timelike curve," or CTC, a loop that could be traversed to travel back in time.

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Hawking and many other physicists find CTCs abhorrent, because any macroscopic object traveling through one would inevitably create paradoxes where cause and effect break down. In a model proposed by the theorist David Deutsch in 1991, however, the paradoxes created by CTCs could be avoided at the quantum scale because of the behavior of fundamental particles, which follow only the fuzzy rules of probability rather than strict determinism. "It's intriguing that you've got general relativity predicting these paradoxes, but then you consider them in quantum mechanical terms and the paradoxes go away," says University of Queensland physicist Tim Ralph. "It makes you wonder whether this is important in terms of formulating a theory that unifies general relativity with quantum mechanics."

Experimenting with a curve Recently Ralph and his PhD student Martin Ringbauer led a team that experimentally simulated Deutsch's model of CTCs for the very first time, testing and confirming many aspects of the two-decades-old theory. Their findings are published in Nature Communications. Much of their simulation revolved around investigating how Deutsch's model deals with the “grandfather paradox,” a hypothetical scenario in which someone uses a CTC to travel back through time to murder her own grandfather, thus preventing her own later birth. ( Scientific American is part of Nature Publishing Group.)

Deutsch's quantum solution to the grandfather paradox works something like this:

Instead of a human being traversing a CTC to kill her ancestor, imagine that a fundamental particle goes back in time to flip a switch on the particle-generating machine that created it. If the particle flips the switch, the machine emits a particle— the particle—back into the CTC; if the switch isn't flipped, the machine emits nothing. In this scenario there is no a priori deterministic certainty to the particle's emission, only a distribution of probabilities. Deutsch's insight was to postulate self-consistency in the quantum realm, to insist that any particle entering one end of a CTC must emerge at the other end with identical properties. Therefore, a particle emitted by the machine with a probability of one half would enter the CTC and come out the other end to flip the switch with a probability of one half, imbuing itself at birth with a probability of one half of going back to flip the switch. If the particle were a person, she would be born with a one-half probability of killing her grandfather, giving her grandfather a one-half probability of escaping death at her hands—good enough in probabilistic terms to close the causative loop and escape the paradox. Strange though it may be, this solution is in keeping with the known laws of quantum mechanics.

In their new simulation Ralph, Ringbauer and their colleagues studied Deutsch's model using interactions between pairs of polarized photons within a quantum system that they argue is mathematically equivalent to a single photon traversing a CTC. "We encode their polarization so that the second one acts as kind of a past incarnation of the first,” Ringbauer says. So instead of sending a person through a time loop, they created a stunt double of the person and ran him through a time-loop simulator to see if the doppelganger emerging from a CTC exactly resembled the original person as he was in that moment in the past.

By measuring the polarization states of the second photon after its interaction with the first, across multiple trials the team successfully demonstrated Deutsch's self-consistency in action. "The state we got at our output, the second photon at the simulated exit of the CTC, was the same as that of our input, the first encoded photon at the CTC entrance," Ralph says. "Of course, we're not really sending anything back in time but [the simulation] allows us to study weird evolutions normally not allowed in quantum mechanics."

Those "weird evolutions" enabled by a CTC, Ringbauer notes, would have remarkable practical applications, such as breaking quantum-based cryptography through the cloning of the quantum states of fundamental particles. "If you can clone quantum states,” he says, “you can violate the Heisenberg uncertainty principle,” which comes in handy in quantum cryptography because the principle forbids simultaneously accurate measurements of certain kinds of paired variables, such as position and momentum. "But if you clone that system, you can measure one quantity in the first and the other quantity in the second, allowing you to decrypt an encoded message."

"In the presence of CTCs, quantum mechanics allows one to perform very powerful information-processing tasks, much more than we believe classical or even normal quantum computers could do," says Todd Brun, a physicist at the University of Southern California who was not involved with the team's experiment. "If the Deutsch model is correct, then this experiment faithfully simulates what could be done with an actual CTC. But this experiment cannot test the Deutsch model itself; that could only be done with access to an actual CTC."

Alternative reasoning Deutsch's model isn’t the only one around, however. In 2009 Seth Lloyd, a theorist at Massachusetts Institute of Technology, proposed an alternative , less radical model of CTCs that resolves the grandfather paradox using quantum teleportation and a technique called post-selection, rather than Deutsch's quantum self-consistency. With Canadian collaborators, Lloyd went on to perform successful laboratory simulations of his model in 2011. "Deutsch's theory has a weird effect of destroying correlations," Lloyd says. "That is, a time traveler who emerges from a Deutschian CTC enters a universe that has nothing to do with the one she exited in the future. By contrast, post-selected CTCs preserve correlations, so that the time traveler returns to the same universe that she remembers in the past."

This property of Lloyd's model would make CTCs much less powerful for information processing, although still far superior to what computers could achieve in typical regions of spacetime. "The classes of problems our CTCs could help solve are roughly equivalent to finding needles in haystacks," Lloyd says. "But a computer in a Deutschian CTC could solve why haystacks exist in the first place.”

Lloyd, though, readily admits the speculative nature of CTCs. “I have no idea which model is really right. Probably both of them are wrong,” he says. Of course, he adds, the other possibility is that Hawking is correct, “that CTCs simply don't and cannot exist." Time-travel party planners should save the champagne for themselves—their hoped-for future guests seem unlikely to arrive.

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Embark on a fascinating journey through time with the Word.Studio Time Machine Simulator. This guide will assist you in navigating the corridors of history, transporting you to different eras and locations with any date and location you choose. Whether you’re a history enthusiast, a student, or simply curious, our Time Machine Simulator offers an immersive experience into the past. Here, you’ll learn how to use this tool to explore historical contexts, encounter remarkable individuals, and indulge in the sensory richness of bygone days. Let’s begin our journey through time!

Step 1: Input the Date and Location

• Entering the Date: Be as specific as possible. For example, “June 28, 1914” will provide a more detailed narrative than just “1914”. Otherwise, leave the field blank and a random date will be chose for you.
• Choosing the Location: If you have a specific location in mind, enter it. Otherwise, leave it blank to be surprised by an intriguing, lesser-known destination.

Step 2: Engage with the Detailed Narrative

• Immerse in the Atmosphere: Expect a vivid description of the social, cultural, artistic, economic, and political atmosphere of the chosen time and place.
• Sensory Experience: Focus on the descriptions of sights, sounds, and scents to feel the authenticity of being in that era.

Step 3: Meet an Individual from the Past

• Connecting with History: A character relevant to the chosen date and location will be introduced. This individual’s story will provide a personal and emotional connection to the era.

Best Practices

• Embrace Variety: Don’t hesitate to explore different eras and locations. Each journey offers unique insights and experiences.
• Reflect on the Experience: After your journey, take a moment to consider how the narrative and the individual’s story enhance your understanding of the past.
• Use for Educational Purposes: This tool can be a powerful aid in learning about historical contexts, social dynamics, and personal stories of different eras.

Please note that while this Time Machine Simulator strives to provide an authentic and engaging historical experience, it may not always achieve complete accuracy. Historical narratives and character depictions are crafted with a blend of known historical facts and creative interpretation to enhance the user experience. As with any tool that delves into history, there may be limitations in the available historical data, leading to potential inaccuracies or anachronisms. Users are encouraged to use this tool as a starting point for their exploration of history and are advised to consult academic sources for more detailed research. Enjoy the journey, but remember to view it as a blend of education and imaginative exploration.

How did this tool work for you? How can we make it better?   Please send us your feedback by using the form below and include as many details as you can. 

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Rewinding Reality: Cambridge Uses Time-Travel Simulations To Solve “Impossible” Problems

By University of Cambridge October 21, 2023

Researchers at the University of Cambridge have utilized quantum entanglement to simulate a scenario resembling backward time travel. This allows for past actions to be retroactively altered, potentially leading to improved present outcomes.

Physicists have shown that simulating models of hypothetical time travel can solve experimental problems that appear impossible to solve using standard physics.

If gamblers, investors, and quantum experimentalists could bend the arrow of time, their advantage would be significantly higher, leading to significantly better outcomes.

“We are not proposing a time travel machine, but rather a deep dive into the fundamentals of quantum mechanics.” — David Arvidsson-Shukur try { window._mNHandle.queue.push(function (){ window._mNDetails.loadTag("974871025", "600x250", "974871025"); }); } catch (error) {}

Researchers at the University of Cambridge have shown that by manipulating entanglement – a feature of quantum theory that causes particles to be intrinsically linked – they can simulate what could happen if one could travel backward in time. So that gamblers, investors and quantum experimentalists could, in some cases, retroactively change their past actions and improve their outcomes in the present.

Simulation and Time Loops

Whether particles can travel backward in time is a controversial topic among physicists, even though scientists have previously simulated models of how such spacetime loops could behave if they did exist. By connecting their new theory to quantum metrology, which uses quantum theory to make highly sensitive measurements, the Cambridge team has shown that entanglement can solve problems that otherwise seem impossible. The study was published on October 12 in the journal Physical Review Letters .

“Imagine that you want to send a gift to someone: you need to send it on day one to make sure it arrives on day three,” said lead author David Arvidsson-Shukur, from the Hitachi Cambridge Laboratory. “However, you only receive that person’s wish list on day two. So, in this chronology-respecting scenario, it’s impossible for you to know in advance what they will want as a gift and to make sure you send the right one.

“Now imagine you can change what you send on day one with the information from the wish list received on day two. Our simulation uses quantum entanglement manipulation to show how you could retroactively change your previous actions to ensure the final outcome is the one you want.”

Understanding Quantum Entanglement

The simulation is based on quantum entanglement, which consists of strong correlations that quantum particles can share and classical particles—those governed by everyday physics—cannot.

The particularity of quantum physics is that if two particles are close enough to each other to interact, they can stay connected even when separated. This is the basis of quantum computing – the harnessing of connected particles to perform computations too complex for classical computers.

“In our proposal, an experimentalist entangles two particles,” said co-author Nicole Yunger Halpern, researcher at the National Institute of Standards and Technology (NIST) and the University of Maryland. “The first particle is then sent to be used in an experiment. Upon gaining new information, the experimentalist manipulates the second particle to effectively alter the first particle’s past state, changing the outcome of the experiment.”

“The effect is remarkable, but it happens only one time out of four!” said Arvidsson-Shukur. “In other words, the simulation has a 75% chance of failure. But the good news is that you know if you have failed. If we stay with our gift analogy, one out of four times, the gift will be the desired one (for example a pair of trousers), another time it will be a pair of trousers but in the wrong size, or the wrong color, or it will be a jacket.”

Practical Applications and Limitations

To give their model relevance to technologies, the theorists connected it to quantum metrology. In a common quantum metrology experiment, photons—small particles of light—are shone onto a sample of interest and then registered with a special type of camera. If this experiment is to be efficient, the photons must be prepared in a certain way before they reach the sample. The researchers have shown that even if they learn how to best prepare the photons only after the photons have reached the sample, they can use simulations of time travel to retroactively change the original photons.

To counteract the high chance of failure, the theorists propose to send a huge number of entangled photons, knowing that some will eventually carry the correct, updated information. Then they would use a filter to ensure that the right photons pass to the camera, while the filter rejects the rest of the ‘bad’ photons.

“Consider our earlier analogy about gifts,” said co-author Aidan McConnell, who carried out this research during his master’s degree at the Cavendish Laboratory in Cambridge, and is now a PhD student at ETH, Zürich. “Let’s say sending gifts is inexpensive and we can send numerous parcels on day one. On day two we know which gift we should have sent. By the time the parcels arrive on day three, one out of every four gifts will be correct, and we select these by telling the recipient which deliveries to throw away.”

“That we need to use a filter to make our experiment work is actually pretty reassuring,” said Arvidsson-Shukur. “The world would be very strange if our time-travel simulation worked every time. Relativity and all the theories that we are building our understanding of our universe on would be out of the window.

“We are not proposing a time travel machine, but rather a deep dive into the fundamentals of quantum mechanics. These simulations do not allow you to go back and alter your past, but they do allow you to create a better tomorrow by fixing yesterday’s problems today.”

Reference: “Nonclassical Advantage in Metrology Established via Quantum Simulations of Hypothetical Closed Timelike Curves” by David R. M. Arvidsson-Shukur, Aidan G. McConnell and Nicole Yunger Halpern, 12 October 2023, Physical Review Letters . DOI: 10.1103/PhysRevLett.131.150202

This work was supported by the Sweden-America Foundation, the Lars Hierta Memorial Foundation, Girton College, and the Engineering and Physical Sciences Research Council (EPSRC), part of UK Research and Innovation (UKRI).

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5 comments on "rewinding reality: cambridge uses time-travel simulations to solve “impossible” problems".

So how do we fast track a path to getting the correct answer 4 out of 4 times so that we aren’t at a 25% correct answer ? That’s my question

not provable, I won’t get in to explaining other than given a persons preferences and a multiple amount of life scenarios of such person and prier choices made a list can be formulated with high to low preferences. There are something that simply cannot be changed that’s history and time is fleeting we make it what it is.

Weren’t we just here about a week ago with a similar scenario and that article mysteriously disappeared into some sort of blackhole shortly after it was published? Since the very basis of the worthiness of capitalism is to gain at the expense of others, I can definitely see its value. Of course the experiment could be run in the future with no problem whatsoever and if the answer should be wrong, it could be run again until the correct answer is achieved, then wait, for time to catch up to the tested event, that way if it were to turn out that time is by nature non-euclidean, even a filter would still produce unacceptable errors, such as what occurs in the high energy fields needed for particle accelerators where virtual particles interfer with the desired observation. Something like that, if we think of time in the same manner as we do space, because other research has already revealed that reality.

Surely this is the equivalent of trying to use entanglement to send information faster than light which is forbidden. The proposed filter must fail.

The gifts analogy is flawed. If I send four gifts one day one, on day two I find out the correct one, and day three I tell him to filter out the three incorrect gifts this is not time travel, simulated or otherwise

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Physicists Have Built A Time Machine Simulator

Suppose you traveled back in time and stopped your grandparents from ever meeting.

This would create a paradox since you never would have been born if your grandparents never met. You've prevented your later birth, so you shouldn't exist anymore.

This is called the "Grandfather Paradox," and it's an infamous one among physicists.

Even though Einstein's famous theory of general relativity actually allows for time travel , the Grandfather Paradox gets in the way. According to Einstein, a gravitational field with enough force (like the one generated by a black hole) could bend space-time enough to fold it back on itself.

This bending could create a path through space-time that returns to its original starting position. It's essentially a time-travel loop. Physicists call it a closed time-like curve, or CTC.

CTCs frustrate physicists because they come with all kinds of paradoxes, like the Grandfather Paradox. If you entered a CTC, traveled back in time and stopped your grandparents from meeting, you would never come back out of that CTC. The principles of cause and effect collapse.

Einstein's predicted CTCs are part of our conventional understanding of physics, but could never allow for time travel without a paradox.

Enter quantum mechanics.

Related stories

While Einstein's general relativity describes the macro world, like planets and galaxies, quantum mechanics describes the micro world of things like atoms and particles. The two sets of laws do not get along well, and physicists are still working on reconciling them.

The math behind quantum mechanics suggests that time travel through a CTC is not only possible, but could be done without creating any paradoxes. So while a person (a macro object) can't time travel without creating a paradox, something much smaller, like a single particle (a micro object), could.

Back in the 1990s, theoretical physicist David Deutsch was the first person to realize this, and he figured out a way to get around the paradox.

In the world of quantum mechanics, the rules are a lot more fuzzy than conventional physics. If a quantum particle, like a photon or an electron, entered one of these time travel loops, it would have to emerge on the other side as that same identical particle. But when a quantum particle enters a CTC, there's no set outcome, only a spread of probabilities that the particle will emerge or not. So a particle that enters a CTC with a 50% chance of coming back out will only fail to make it back out of the CTC half the time. It's a crazy solution, but that 50/50 chance is good enough to solve the paradox according to the laws of quantum mechanics.

No one has discovered a CTC or successfully built one, so time travel is still not possible. But physicists at the University of Queensland in Australia have built a system that can mimic how a quantum particle would behave if it passed through a CTC and interacted with a younger version of its self. They've effectively built a time machine simulator.

The team of physicists simulated a particle traveling through a CTC by firing pairs of entangled light particles through a circuit. Entangled particles are created from the same parent particle, so they are identical to each other and any force that acts on one immediately affects the other. The entangled particles passed through a circuit and hit a polarized beam splitter that broke them apart so they could interact with each other. Think of it has you meeting the younger version of yourself right at the entrance to a time travel loop.

The physicists encoded the polarization of each particle pair they tested before sending it through the time machine simulator, so the polarization of any particles that emerged could be measured and compared to the original to make sure it was in fact the same particle.

So what happened when the simulated past and present versions of the particle met each other? The interaction was paradox-free, and the quantum particles came out of the mock time machine in exactly the same way they entered it.

Time travel isn't possible yet, but this simulation means it could be. The experiment also fit both the laws of general relativity and quantum mechanics, demonstrating that the two bodies of law could actually be compatible.

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