The arrow of time marches forward. Eggs don’t uncrack; milk doesn’t unspill. But now new research has found a way that this arrow could be reversed in a quantum system, flip-flopping events as if time were flowing backward.
The findings are currently theoretical but could be tested experimentally, says Luis Pedro García-Pintos, a physicist at Los Alamos National Laboratory and first author of the new study, published February 19 in the journal Physical Review X.
Ultimately, reversing time on a quantum level could stem the information loss that stymies quantum computers, says Andrea Rocco, a physicist at the University of Surrey in England, who was not involved in the research. “This would immediately be an incredible advantage in terms of the building of these quantum technologies.”
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