今年五月，中国研究组将光子传送通过100公里的自由空间，为量子通信卫星打下基础。 “隐态传输是对象从一个位置穿越到另一位置的非凡能力。”
　　关键不是传送的物理对象而是描述它的信息。这可以被应用到一个类似的对象在一个新的位置有效使用新标识。
　　这绝不是科幻小说。自1997年以来物理学家们一直在传送光子，该技术成为在全世界光学实验室的标准。
　　是隐态传送成为现实的现象被称为量子纠缠，它是空间分隔的两个量子物体共享相同的存在的深邃而神秘的链接。
　　隐形传输非常有用。因为远距传送的信息不经历中间空间，它可以不被秘密窃听者截获。
　　出于这个原因，隐态传输是量子密码系统的支撑技术，一种近乎完美的保密信息发送技术。
　　不幸的是，纠缠光子是脆弱的对象。因为玻璃对纠缠的影响，他们无法在光纤前进无法超过1km。这严重地限制了量子密码系统的有效性。
　　然而，物理学家们在光子穿过大气层有更多成功范例。2010年中国研究组宣布，它已传单光子的距离超过16公里。轻易震撼了世界。
　　现在同一个研究小组说，它打破了这个纪录。在中国科学技术大学的印娟和她在上海的队友们说，他们横跨中国的一个湖传送纠缠光子对距离超过97公里。

原文附后：
　　[MIT]Best of 2012: Chinese Physicists Smash Distance Record For Teleportation
　　In May, a Chinese team teleported photons through 100 kilometres of free space, opening the way for satellite-based quantum communications
　　“Teleportation is the extraordinary ability to transfer objects from one location to another without travelling through the intervening space.
　　The idea is not that the physical object is teleported but the information that describes it. This can then be applied to a similar object in a new location which effectively takes on the new identity.
　　And it is by no means science fiction. Physicists have been teleporting photons since 1997 and the technique is now standard in optics laboratories all over the world.
　　The phenomenon that makes this possible is known as quantum entanglement, the deep and mysterious link that occurs when two quantum objects share the same existence and yet are separated in space.
　　Teleportation turns out to be extremely useful. Because teleported information does not travel through the intervening space, it cannot be secretly accessed by an eavesdropper.
　　For that reason, teleportation is the enabling technology behind quantum cryptography, a way of sending information with close-to-perfect secrecy.
　　Unfortunately, entangled photons are fragile objects. They cannot travel further than a kilometre or so down optical fibres because the photons end up interacting with the glass breaking the entanglement. That severely limits quantum cryptography’s usefulness.
　　However, physicists have had more success teleporting photons through the atmosphere. In 2010, a Chinese team announced that it had teleported single photons over a distance of 16 kilometres. Handy but not exactly Earth-shattering.
　　Now the same team says it has smashed this record. Juan Yin at the University of Science and Technology of China in Shanghai, and a bunch of mates say they have teleported entangled photons over a distance of 97 kilometres across a lake in China.
　　Source：MIT Technology Review