Abstract: Since first proposed in 1993, quantum teleportation has been enjoying an enormous development both theoretically and experimentally. Quantum teleportation not only can help with investigating the foundation of quantum mechanics, but also is the footstone of quantum technologies, and it can be applied in quantum repeaters and distributed quantum computing, which are essential for a quantum network. However, before quantum teleportation can be practically applied in quantum networks, there are some technique problems that must be solved in advance experimentally, including the quantum interference between independent sources. In practical applications, quantum sources are normally separated far apart, and linked by optical fiber. To enable the interference between photons from different sources means making them indistinguishable from each other in all degrees of freedom even after they have passed through at least several kilometers of optical fiber, the properties of which can be greatly influenced by the surrounding environment. Recently, two groups (one from Hefei, one from Calgary) overcome this challenge and respectively accomplished the field test of quantum teleportation with independent sources, which marks a critical step towards the realization of a global quantum Internet.

Key words: quantum teleportation, quantum repeater, quantum computing, quantum network, independent sources

摘要： 量子隐形传态自1993年被提出后，在理论和实验领域均获得了长足发展.量子隐形传态不仅可以帮助探究量子力学的奥秘，也是量子技术的基石，可被应用于量子中继和分布式量子计算等量子网络的重要组成元素中.在实际运用于量子网络前，量子隐形传态尚有许多亟待解决的技术难题，其中包括独立源的量子干涉.解决独立源的干涉问题，意味着要将来自不同光源的光子在各个自由度上都不可区分.如果光子还需要通过被外界环境影响而性质随时变化的光纤，难度又会极大提高.最近，合肥和卡尔加里的2个实验组解决了独立源的干涉问题，同时完成了拥有独立源的量子隐形传态的外场实验，为实现全球化实用量子网络迈出了关键一步.

关键词: 量子隐形传态, 量子中继, 量子计算, 量子网络, 独立源