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‘Quantum time flip’ makes light move simultaneously forward and backward in time



For the first time, physicists have made light appear to move simultaneously forward and backward in time. The new technique could help scientists improve quantum computing and understand quantum gravity.

By splitting a photon, or packet of light, using a special optical crystal, two independent teams of physicists have achieved what they describe as a ‘quantum time flip’, in which a photon exists in both forward and backward time states. 



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