![]() ![]() ![]() Scientists have known that this phenomenon of time reflection could happen, theoretically, since 1958. When a signal is reflected in time, it travels back toward its source in reverse order and with a new frequency. Play icon The triangle icon that indicates to play “One of the big holy grails of physics is time-reversal symmetry,” Michael Pravica, Ph.D., a professor of physics at the University of Nevada, Las Vegas, tells Popular Mechanics. ![]() It sounds like the stuff of sci-fi, but earlier this year, a paper published in the journal Nature Physics showed the first evidence of a time-reversed electromagnetic signal. If you shine a light at a mirror, the beam is reflected inward to a central focal point, bouncing back toward you in a predictable manner-it’s a simple reflection of light, a spatial inversion.īut what if you could reverse an analog signal in time? When a signal is reflected in time, it is inverted in time and its frequency is altered.When a research team created a highly customized circuit earlier this year, they were able to reflect signals in time, which has never been reported before.If scientists are able to successfully conduct analog time-reflection of electromagnetic waves, they can greatly speed up some computer and phone applications. ![]()
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