Circa 2020
Like watching a movie in reverse, physicists have just demonstrated a new technique for the time-reversal of a wave of optical light.
That doesn’t mean that they have actually reversed the flow of time; rather, they have found a way to induce an optical wave to retrace a forward path in reverse, returning to its point of origin.
It’s the first time that time reversal of optical waves has been achieved with full control over all of the degrees of freedom of light simultaneously.
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