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

Re:Physicists Create Time-Reversed Waves of Optical Light by franek on Friday December 18, 2020 @11:33AM (#25468683)
Sure! I'm assuming if we have the means to fake the one turbulence, we can also cancel the other. Or the arrow is just not moving, thus no "natural" turbulance to cancel.

I'm not saying that air turbulence wasn't a very strong indicator for motion! And I am not sure the technology to fake them completely does exist. But I don't see why it shouldn't be possible, maybe with a very elaborate set of fans, air ducts and loudspeakers.

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Re:Physicists Create Time-Reversed Waves of Optical Light by mrec on Monday December 21, 2020 @05:24AM (#25493616)
> I'm assuming if we have the means to fake the one turbulence, we can also cancel the other

That seems like a leap. There's a huge difference between generating some plausible-looking turbulence and generating one absolutely precise pattern of turbulence at one exact instant.

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