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A comment on Physicists Create Time-Reversed Waves of Optical Light.

Re:Physicists Create Time-Reversed Waves of Optical Light by sholladay on Friday December 18, 2020 @01:27AM (#25464436)
The article mentions that this can be applied to sound waves. Could that be used to spy on conversations that happened recently in a room, kind of like the Observers did towards the end of Fringe?
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Re:Physicists Create Time-Reversed Waves of Optical Light by TaupeRanger on Friday December 18, 2020 @07:44AM (#25466513)
Not really, this is about reversing waves that have already happened. The technique requires you to fully capture the outgoing propagation in order to reverse it. It isn't a way to "extract" previous vibrations without recording equipment.
[ Parent | on HN ]