我国首颗“量子卫星”升空_时事_双语阅读-查字典英语网

我国首颗“量子卫星”升空

量子卫星是中国科学院空间科学先导专项首批科学实验卫星之一，

其主要科学目标是进行四大实验任务：

星地高速量子密钥分发实验(experiment on high-speed quantum key distribution from space to earth)

广域量子通信网络实验(wide-area quantum communications network experiment)

星地量子纠缠分发实验(experiment on distribution of quantum entanglement from space to earth)

地星量子隐形传态实验(experiment on quantum teleportation from earth to space)

量子通信是迄今唯一被严格证明为无条件安全的通信方式。因为量子通信的密码不是预先设定好的，而是在传输过程中随机形成的。

The satellite will create pairs of so-called entangled photons, beaming one half of each pair down to base stations in China and Austria.

卫星会将一对对纠缠光子拆分后发射到位于中国和奥地利的基站。

This special kind of laser has several curious properties, one of which is known as "the observer effect" - its quantum state cannot be observed without changing it.

这种特殊光束有很多特质，其中一个就是所谓的“观测者效应”，其量子状态一旦发生变化就会被观测到。

So, if the satellite were to encode an encryption key in that quantum state, any interception would be obvious. It would also change the key, making it useless.