量子电池可通过逆转时间充电

PHYSICISTS have shown how time can effectively be reversed for some quantum systems, which would allow for new ways to harvest energy. Time seems to flow one way, but things work differently in the quantum world For every process we observe in the universe, events appear to happen in only one direction, following an apparent arrow of time. But most physical laws and equations work whether time flows forwards or backwards. Physicists have different explanations for why a discrepancy exists between the observed forward arrow of time and the permitted two-way flow. For example, the second law of thermodynamics says systems are more likely to become disordered as time goes on, creating a preferred direction of time. …