I just thought I'd leave these here, the catchy headlines got me but I think there is plenty more to find if I dig more. The idea of using QT for time travel seems interesting though. https://www.telegraph.co.uk/news/sc...-machine-allows-paradox-free-time-travel.html and https://yourtimetravelexperience.com/quantum-tunneling-explained
I really doubt that any form of travel to the past is possible since the past no longer exists. Traveling forward - just go very fast...
Fast travel into the future may be the only option since going back into the past likely would need us to break physics.
Not according to Einstein and Minkowski, where both the past and the future both exist (as a result of Special Relativity; there being no universal now) in a block universe. It is this aspect of SR that makes it incompatible with quantum mechanics. https://en.m.wikipedia.org/wiki/Eternalism_(philosophy_of_time) Of course, there are alternative philosophies. https://en.m.wikipedia.org/wiki/Growing_block_universe
It's an interesting idea, but how would one test it? So you find a way to travel back in time and save Abraham Lincoln at Ford's theater. The minute you somehow get back where you came from you seem to have sidestepped whatever chain of causation you've caused because postselection. You could travel back again and see those events and maybe live through the changed circumstaces as the unfold but it would not effect your relative present. Or something. Causation has always been kind of the burr in the saddle with time travel. Though I will admit, I don't understand sometimes why its important. If time is an infinite multidemensional tableau and not either some primary solitary rail, sanctified and unable to be disturbed, or a train whose tracks are laid at one track per hour (making no sense in a relative universe.. whose hour? whose frame?) then causation is a polite way for people who live with 3 dimensions and a single time understanding to sort it all out. Not that the universe ever REALLY makes sense, deep down inside. in this tablau einstein rosen bridges to whenever seem as plausible as wherever, again making one wonder what this trouble with causation was in the first place. If time travel is possible someone, something, or some cosmic affect has already done it many many times. and we're still here, or at least we think we are which is good enough. You will shouldn't have a baby with your grandmother back in time. That's just wrong.
Acoording to one hypotheseis, a multiverse gets rid of the paradoxes to do with time travel -- you travel back and alter a different reality. Recently, someone has shown that inconsistency of timelines might be possible in QM. History need not agree for different people. Makes me wonder if this is a possible explanation for people I believed having died years ago seemingly still being alive and for a certain historic disaster having taken place on a different day from what I remember. More likely, my memory is faulty as I have no physical record to confirm my version of events.
Is that like the so called "Mandela Effect" where people supposedly have two different memories of his life?
What if you should sometimes underestimate that ability, and you have just deceived yourself into thinking that you should never do that?
You cant rewrite the past, period end of story because the past has already taken place and is not stored in two mirrors facing each other.
would a quantum rear-view mirror have a sticker that says "Objects in the mirror may have either location or velocity displayed"
I know. I was intending to reply to the previous poster -- kind of pointless as it turns out that I'm invisible to him.