Arrow of time and its reversal on a IBM quantum computer

[andrew s 1905]

I would like to know what the implications of this paper are https://arxiv.org/abs/1712.10057.

They say " Here we show that, while in nature the complex conjugation needed for time reversal is exponentially improbable, one can design a quantum algorithm that includes complex conjugation and thus reverses a given quantum state."

Is this true time reversal does the arrow of time reverse at least in the simulation?

Regards Andrew

 

[DarMM]

Scott Aaronson's summary is good:
https://www.scottaaronson.com/blog/?p=4147

 

[Demystifier]

If they reversed time on a quantum computer, then we (my collaborators and me) reversed time on a classical computer:
https://arxiv.org/abs/1011.4173v5
See in particular Figs. 2, 3 and 4.

 

[PeroK]

I often reverse the arrow of time using the rewind button on my TV remote control!

 

[DarMM]

I often reverse the arrow of time using the rewind button on my TV remote control!

Such godlike powers were not meant for mere mortals.

 

[andrew s 1905]

Ok thanks I see it was not as profound as claimed.
Just for the record I I have a simulation of a perpetual pendulum running on my computer. Seems the paper is in this class of achievement albeit on a quantum computer.

Thanks again Andrew