量子光打破牛顿定律

A “quantum swimmer” demonstrates a fundamentally different mechanism for motion Karmela Padavic-Callaghan FOR most objects, for every action, there is an equal and opposite reaction. But if you are swimming upstream in a river of quantum light, the normal rules don’t apply. Physicists have demonstrated that breaking Isaac Newton’s third law of motion in such a setting can be useful, leading to new ways of controlling quantum light in experiments and devices. Moving upstream against the current is possible, but at the cost of expending energy. Yi Hu at Nankai University in China and his colleagues wondered whether a passive swimmer that doesn’t do so could still move upstream. …