神奇的量子力学将在水下通讯领域发挥重要作用。中国上海交通大学金贤敏团队首次实现纠缠光子在海水中的传输,他们迈出了水下量子通信的第一步,而通过这种方式传递的信息将不可能被第三方截获。光子是一种很好的量子比特的物理实现,因其能在光纤和大气中传输很长距离却不会受到环境干扰。脉冲激光通过非线性晶体进行相应的相位匹配,产生一对下转换光子。这对具有特殊联系的光子就是纠缠光子源。只要对纠缠光子源中的一个光子做操作,另一个光子会相 Magical quantum mechanics will play an important role in underwater communications. For the first time, the team at Jinxian Min, Shanghai Jiaotong University, China, is entangled photons in seawater for the first time. They have taken the first step in underwater quantum communication, and the information passed in this way will not be intercepted by a third party. Photons are a good physical implementation of quantum bits because they can travel long distances in fiber and the atmosphere without being disturbed by the environment. The pulsed laser undergoes phase matching through nonlinear crystals to produce a pair of down-converted photons. This pair of photons with a special relationship is the entangled photon source. As long as one of the photons in an entangled photon is operating, the other photon will phase