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Physicists confirm the incredible existence of "time mirrors" (www.earth.com)

submitted 5 days ago by [email protected] to c/[email protected]

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This sort of time flip has been described as looking into a mirror and spotting your back instead of your face...By carefully adjusting electronic components on a strip of metal, they introduced a sudden jump that reversed the direction of incoming signals...The outcome was a time-reversed copy of the original wave, appearing just as predicted but never before seen with clarity...A wave that can jump to a new frequency and then rewind might open new possibilities for data transmission at different ranges of the spectrum. It could also reshape how certain sensors and imaging systems are designed.

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[-] [email protected] 11 points 5 days ago

So thats creepy.. yep..

[-] [email protected] 9 points 5 days ago

The researchers also demonstrated that the duration of the time-reflected signals was stretched in time due to broadband frequency conversion. As a result, if the light signals were visible to our eyes, all their colours would be abruptly transformed, such that red would become green, orange would turn to blue, and yellow would appear violet

This sounds like wave propagation through a given medium, that changes state uniformly, having an instant ‘reflection’ where the wave doesn’t bounce off of anything (so not hitting a wall… it just reverses in ‘time’) and then drops two ‘octaves’ due to energy loss.

[-] [email protected] 8 points 5 days ago* (last edited 5 days ago)

I think the neat part isn't that - it's neat because of the time component doing it.

Yet another strange phenomenon of the quantum realm that seemed impossible but is infact real.

If I remember thinking back to my class on QED, we specifically ignored this solution because there wasn't a real world demonstration of it (which was ironic, as one of my professors was working on the problem in her doctorate).

Makes me want to find that book.

Edit: I might be wrong, I'm thinking of deriving something out of Hilbert Space to Dirac-von Neumann axioms

this post was submitted on 27 May 2025

199 points (98.5% liked)

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