Time mirrors are very cool. They seem a bit magical, undoing the damage that time has done, at least under the right circumstances. For light and for water waves, we know how to make a mirror that behaves like it reverses time. But for quantum mechanical waves, some types of time mirrors have proven to be difficult. A recent theory paper suggests that, under the right circumstances, a mirror that undoes the past might be possible. And, it comes with a bonus movie.
Quantum time mirror. Video courtesy of Phillip Reck, University of Regensburg. (video link)
Before we get to the lovely movie and a bit of inexplicable quantum theory, let me give you a taste of what a time mirror means in a classical world.
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Source: Ars Technica – Bouncing electrons off a time mirror