The Quantum Mechanics of Time Travel 

This guy laughs at 9:59 phase shifted and interfered with itself.

His laugh though! lol

Great video. I hated physics in my college days. Years latter, I've gone through my old physics with calculus textbook twice!! Took me a few years but I now find my self appreciating everything and understanding laws of the universe far more clearly.

I love the relation between thermal dynamics and the quantum mechanics of time travel, very cool.

Tough crowd.

Delayed choice shows that the universe does time-travel constantly, and gives you a template of how you are required to accomplish the same task. The universe is never wrong, it's that simple. Where the information goes, when it doesn't arrive to destroy itself, and whether it splays evenly throughout the universe, and what effect happens to the universe, in such cases, is still on my mind. I once had a weird dream, with hockey and quantum mechanics. I had to step away from my computer when the hockey stick came out, as this is exactly how I would have told myself that my future time-travel was/will be successful.

His laughter is so nerdy. I liked this lecture, very informative and intuitive

Really enjoyed this! Keep them cominggg! 😁😁

interesting subject here. I am new to this topic so alot of this is over my head but I will come back and watch again. Thanks!

Great stories to start! Love it!

Great that I found this video. I translated Seth Lloyd's book Programming the Universe from English into Ukrainian. Now it's a pleasure to listen to things Seth Lloyd says. If only they gave me more of his books and others' ones to translate. The book is just terrific.

this is truly exciting & brilliant stuff

I loved his explanations.

The best part of this lecture is precisely at 1:07:51 when you hear him giving this rather bizarre laughter, which he did one before in this lecture only once (but for a comparatively short time). It is a distinct laugh. I can see people have made negative comments with regard to his theoretical as opposed to hands-on approach. Perhaps you can find some context and joy in his laughter. I do realize, however, some might find it unsettling. I was amused and wish I could can it. It would make a great laughing loop.

This is the most interesting lecture ever

Glad I found this!

Very interesting. Thank you very much.

very good information thanks

Sir , we are able to watch this beautiful lectures which recorded in past , but somehow ( yotube ) we are able to watch in future without harming anyone .

The history of ideas is important as it portends where the 'next' idea comes from. Good idea.

19:30 The electron/positron thing blew my mind

I enjoyed this lecture.

Anyone else notice the subliminals (sm)? This was a great lecture hard not to learn something. I look forwards to more. Donidorko (movie) is a greak example of the coffee cups handle as he is in a time loop after death and returned to that resting or natural state as he returns to the original time line. Something similar may be the case with black holes but can't be indefinitely proven.

I am a Ph.D. computer science student, but I studied physics as an undergrad. Physics has always been my passion, since literally as far back as I can remember (2-3 years old). I invented the flywheel at age 4. Spark-gap radio transmitter at age 5. I have a very deep knowledge of physics and mathematics now. I don't think I was pedantic. I find it very hard to believe, given your comment, that you understand this stuff. You've got a LOT more learning to do.

StarsDanceTV9 months ago Dr. Seth Lloyd, an MIT professor and self-described "quantum mechanic," describes the quantum mechanics behind time travel during a guest lecture at the Institute for Quantum Computing, University of Waterloo. Recorded on Nov. 4, 2010, this is the entire lecture entitled "Sending a Photon Backwards in Time." Dr. Lloyd also sat down for a one-on-one interview at IQC, during which he discusses the weirdness (and beautiful simplicity) of quantum mechanics, and the incredible importance of quantum information research. Excerpts from this interview are below: Seth Lloyd on Quantum Weirdness:

cheers. I will have a look at it

I studied various subjects related to time travel including a masterclass on philosophy of time. I am planning on writing a course on time travel.

Who's here after hulks explanation about back to the future.

42:02 why only negative Particle fall into Blackhole why not positive and how do we know that , it's reality or theory ??

The final countdown! Great time travel movie 😀

Dash Rip Rock played Buddy Holly's "Not Fade Away" at The Grant Street Dance Hall in Lafayette, La. in the year 1989 . . .and it was Euphoric.

Time travel is an perfect example of a normal human being wishing to travel back in time because of of a normal human always regrets or wishes someone beloved one to come back :)

The Quantum Mechanics of Time Travel

great, I read Michael Crichton's novel recently, This lecture helps ex[lain it better.

I wish I had the intellectual capability to better understand this topic or others like it. Nevertheless, to the degree that I could understand it, very informative, a great lecturer.

love the sense of humor he has

From the proposition of the universe as a Quantum Computation, ie the reality of existence is a standing wave in which the past and future are every side of now as potential inherent in the incidental structure, the incident connection of the kind modeled in Analog computers, then the central point of time is fixed now and forever. The architecture is implied by cyclic reflection, of which the simplest form/dominant probability, is a spectrum of resonance, part of which Astronomy studies. The flow of information past to future and future to where the past was when reflection of the information now shaped the present, is contained in virtual continuity of the kind that is mathematical. Time travel is just travel across the combinations of the information spectrum that is the apparent physical structure of the universe, the "architecture". But don't let any of the process ruin a good story, proving something wrong can reveal what is right some-times, (the probabilistic stability of shaped waves of QM).

it picks up after 13:22

10:00 rlly loved that part

amazing!

Love this video greets from Mexico City..

If I watch this YT and then go back in time and start it over, is it going to be different, as it has been observed? Or is the act of observing it changing it, and will be the same the second time? Think deja vu has anything to do with time travel?

I have studied this stuff for some years now. He makes sense to me.

that's actually what I was thinking about when I made this post - and the data didn't travel faster than the speed of time. - this also means it can travel to another time zone instantly - thus traveling time in a practical non fiction way. - ie I'm not 12 hours older traveling from the US to Europe. The only way imo to amplify that effect is with greater distance

At 32:28 Could it be that the memories are stored in the field loop not erased. That could also be the marker to exacting point of return from other dimension. The only way in is the only way out.When you return, you remember everything to the point up to leaving and memories of the trip are in the loop field...

Sir, Where exactly should the singlet lie on the curve ? 35:00 onwards.

Are hair follicles small enough to be influenced by quantum mechanics? therefor causing the hair of a person to be in two states of existing and not existing at the same time?

For those interested I had a time travel experience when I was a kid which I am 95% sure was an OOB experience though (which I used to have many of) and not a physical one. I do actually have my doubts regarding physical time travel. Anyway for the open minded here that might trust in my experience the one thing I noticed of importance is the loop. So the scenario was that aged 8 i enter a wormhole that for some unknown reason appears in my bedroom, and travel 15 years in time play on a game boy in a dept store (hadn't been invented yet) go back to being a kid. 15 years later I re-lived that same day as a adult. So here is my hypothesis. To time travel that took place and the information i was exposed to was bi directional. So I took a peek into the future when I was a kid and no doubt could have changed the future by for example persuading the Gameboy maker to call the toy a Gamegadget! In which case 15 years forward would mean i would end on playing on a Gamegadget and not a Gameboy. What blows my mind is how free will is sill possibly in a closed time-like curve!?

i like the idea that there's only one particle. zooming around at infinite speed, appearing thus to be everywhere at once - hence, entanglement.

Great lecture! Seth Lloyd is awesome.

" You're right, I was unfairly scoffing at you" lmao priceless

What if by traveling in past we just leave our initial timeline just without us and create a new timeline where weverything is the same but with us from future in it? This way one can actually meet "oneselves" and it would be a meeting of two different people, since they have same origin but different outcome. Grandfather paradox is solved because traveler is "cut" and pasted into an old timeline, changing it into a new one, and if one's old self is present, new one can kill the old one and still be alive, because new's self isn't in this timeline, thus travelers can't change their past i.e. their origin, but can create a new timeline based on past, but with traveller in it.

Hi Dr. Lloyd, Because we exist in a condition of gravity on the earth which is different than in other sections of space: how can we make a man made black hole or a worm hole - This closed time line curve without that much mass on a smaller scale?

I find it extremely interesting that I can enjoy this content as much as a world star knockout and my two favorite artists right now are Kevin Gates and Chris Stapleton. We humans are diverse and complex.

Awesome class. Was 46:49 an example of time travel?

Screw that's 44:50 glitch. Anyone got the fixed video? Or it was a some naked electron that hit the camera man...

The book "Starfire" demonstrates many time travel methods, including a "time trap".

I may or may not be about to waste an hour, but I'm gonna give this guy a chance because I fucking love learning about quantum mechanics!!

He is super great and funny. we think a lot alike.

Omg, it's Wornstrom from Futurama :O.

over 60k views... you all give me hope in humanity

A black hole is initially created by the second harmonic comma. And yes, the arrow of time moves up, not forward. But there are two arrows and time moves backwards to move forward again because E=T and time must also be conserved. Mass is in oscillation just as the DNA's X-Ray shows.

Felt proud after listening MAHABHARATA in this topic 🧡🚩🇮🇳

If you go faster then the speed of light you do not go back in time. Rather what you achieve is the slowing down of other particles (conservation of energy) that go back into close time loops separated from whatever engineering feat you did to achieve that.

Aaargh! that markersound is killing me!

Couldn't simply stopping someone on the street to ask them for directions throw their time line completely out of whack?

What's a RU-vid video description?

one book that's a combination of not changing the past due to "a quantum fluctuation" and also being able to is the book 11/22/63, a man goes back in time to stop kennedy's death and he realizes that the past actively resists being changed. Like for instance, he bough a brand new car 2 days ago, he needs to go across town to stop something big from happening and then the car breaks...

so returning has to be in a different space, but u cant change time without changin space to return u have to return to both perfectly, or u dont really complete the circle back, so if the split in to the circle path takes longer than a micromoment you'd die before either straight or circle path can happen, am i wrong? but if in a microsec ur photons /protons move still wouldnt be fast enough to get out of the way but if you could then you creat 2 of you so then which one goes which direction?

Wow. If I could go back in time and not watch this...

I don't know, I personally always like when they talk about the paradoxes, although granted he didn't say anything I haven't heard before (except to distill all of them down to two unique paradoxes). Plus it was only the first 1/3 or less of the lecture, he got into the nuts and bolts after that. I guess if you're a physics student or an actual physicist it might have been somewhat boring, but I enjoyed it.

So outside the blackhole there is light at a certain point. It's not a spectrum. Hence black holes are quantized in their light interaction with one state being the highest probability overwhelmingly (being sucked in obviously).

I am convinced that Christopher Nolan saw this lecture and decided to make two movies about it.

what is description ?

Dr. Seth Lloyd, an MIT professor and self-described "quantum mechanic," describes the quantum mechanics behind time travel during a guest lecture at the Institute for Quantum Computing, University of Waterloo. Recorded on Nov. 4, 2010, this is the entire lecture entitled "Sending a Photon Backwards in Time." Dr. Lloyd also sat down for a one-on-one interview at IQC, during which he discusses the weirdness (and beautiful simplicity) of quantum mechanics, and the incredible importance of quantum information research. Excerpts from this interview are below: Seth Lloyd on Quantum Weirdness:

With the interactions, can we not transfer knowledge to those we visit, influencing their decision making?

Seth Lloyd of MIT in his video on time travel says that the memory of the future is erased in the time traveler's mind when he exists the time machine wormhole star gate in the past - in David Deutsch's many-worlds theory D-CTC model, but not in the P-CTC single-world model. There are also claims of super-computation in the D-CTC theory. The nonlinearity and non-unitarity should allow the future memories to be preserved as they allegedly are in Seth Lloyd's post-selected (Aharonov) P-CTC which may be equivalent to my back-reaction post-quantum Bohm pilot wave theory.

what class is this in where at

Actually the P = NP computational paradox proposed by Moravec is probably the strongest argument against the Novikov self-consistency principle.

Project Almanac, is a pretty good movie too.

4 momentum motors for a plane momentum - 1 forward 1 back pulsed accelerator motor - Q up a van der graff generator - move it and it creates it's own O(magnetism) = on an F-14 or something like that

youtube isn't allowing me to post the link - the above link isn't working, search for "Quantum Consciousness, Quantum Mind STUART HAMEROFF" he discusses time travel

i have not yet traveled "back in time", but the future i have visited via dream state in my childhood , i dreamed of things that have come true in my own life line.

Information travels instantaneously in synchronicity Daniel Ray Waters Hazelton Ortiz

"Primer" best time travel movie ever for science geeks.

1:00 - ... this seems to imply that TT communication can only occur if plausible deniability is allowed!

I have a question? If anyone went back to the past and changed it. would not the the memory of those connected to all that changed be adjusted and what first had happened before the change be seen as a false scenario or imagined event. .

Yes, or what about spherically curved strings at the Planck scale? A grid that leaks gravity but also acts as a hyperdimensional membrane? It would fit nicely with other quantum aspects and supports it would Deutsch's theory.

Love.

The Paili Exclusion Principle states that each electron has a precise coordinate designation and that no two electrons can occupy the same coordinates at the same time. Going back in time would violate this -- would it not?

Another paradox (maybe not the correct word to use) could be that things going into the past will add extra matter and probably energy to ( at least to the past's ) universe. This probably breaks matter creation laws and would be a possibility of filling the universe with matter. I believe the 'Unproven Theorem Paradox' described at around 13 minutes into the video is also often referred to as a 'Bootstrap Paradox'.

So I have a theory in time traveling where after you go back, the plot at the time that you traveled will reset to it's original state so even if you kill your grandfather before he met his wife, it will not change anything because if you go back to the present time, the time that you go back into will reset to it's original state.

#QuantumMechanicsOfTimeTravel

Don't be disrespectful of Hot Tub Time Machine! 7:40

It's Chip Chiperson!!!🤩

as soon as the 1st copy appears in straight foward time ud then have a quadrillion copies of yourself taking up more space then there is surface of the earth, in circle time if both go into the circle time then the same thing would happen but which would then make the circle a different circle timeline cause then 2 would return, then ud only have a cirle if the mechanism effected all clones equally or else some would & some wouldnt circle back or at various size circles for each one. am i wrong?

Susan Blackmore and Seth Lloyd are profiles on my website Benji Bear and Friends.

One of many , "Natural method " I think , when two massive blackhole are going to collide by spiraling around each other they both can drag spacetime so much so can create super compressed and mass free space between them ( in other word so called #wormhole ) so if spaceship could go through that center region " between two nearly colliding blackhole " that will cover more spacetime in relativity small space ( in other word kind of faster than light travel ) so can theoretically Into The #Past 🤔 My thought !!

What is a time light spiral? Could these curves be segments of a spiral?

10:00 Best laugh ever ...