Quantum time machine 'allows paradox-free time travel'

Telegraph ^ | 7/22/10 | Tom Chivers

[LibWhacker]

Quantum physicists at the Massachusetts Institute of Technology believe it is possible to create a time machine which could affect the past without creating a "grandfather paradox".

Scientists have for some years been able to 'teleport' quantum states from one place to another. Now Seth Lloyd and his MIT team say that, using the same principles and a further strange quantum effect known as 'postselection', it should be possible to do the same backwards in time. Lloyd told the Technology Review: "It is possible for particles (and, in principle, people) to tunnel from the future to the past."

[Lancey Howard]

Here is an image of the time machine:

[Brett66]

Why do they think there’s a real “grandfather paradox”? The molecules in your body don’t care about an association you have with someone in the past.
You’ll go right on existing if you kill your grandfather, the universe does not care, it’s just a paradox in our minds.

[WOBBLY BOB]

‘could I interest you in our maintenance and repair warranty upgrade’ ?

[onedoug]

Observationally, the universe is expanding. Thus for one to go back in time it would seem necessary to shrink the universe in it´s entirety to what it´s radius was at a given time in the past. Or, to go forward, the expansion would seem to have to be accelerated. The energy inputs required for either would seem so large as to be in the limit of infinity. Not to even mention the alignment of every particle, which would seem to have to be precisely as it was in the past, or taking into account any randomness of the future.

In other words, I don´t think you can do it. .