Coming Soon: Marty McQuantum
“The researchers calculated that firing a short laser pulse at graphene could instantaneously trigger a ‘population reversal,’ switching electrons to holes and vice versa. This inversion of behavior is ‘effectively a propagation back in time,’ Richter said. Such a quantum time mirror could be made with current state-of-the-art technology, the researchers added.
Although the work is not intended to test the limits of time reversal, such fundamental restrictions may appear ‘once the experimental drawbacks are surmounted one by one,’ said quantum physicist Horacio Pastawski at the National University of Córdoba in Argentina, who did not participate in this study. He noted his own research explores how time reversal may become impossible once a system becomes complex and chaotic enough.
Richter stressed this quantum time mirror only works for relatively tiny systems protected from environmental disturbances. ‘It’s completely impossible to reverse time this way with, say, a person,’ he said. ‘Still, an interesting future direction one may ask is how large a system could be made that can experience reversal with a quantum time mirror.'”
Zaps from a Laser Could ‘Reverse Time’ on the Quantum Scale – Inside Science
the observer effect 