Quantum Quirk: Stopped Laser Pulse Reappears a Short Distance Away Harvard University researchers have halted a pulse of laser light in its tracks and revived it a fraction of a millimeter away.

• 哈佛大学的研究人员将一束激光脉冲在其径迹内停止，而在几分之一毫米的距离外该激光又得以再生。