Group of Applied Physics, University of Geneva, Chemin de Pinchat 22, 1211 Geneva 4, Switzerland.
ID Quantique SA, Chemin de la Marbrerie 3, 1227 Carouge, Switzerland.
Phys Rev Lett. 2018 Nov 9;121(19):190502. doi: 10.1103/PhysRevLett.121.190502.
We present a quantum key distribution system with a 2.5 GHz repetition rate using a three-state time-bin protocol combined with a one-decoy approach. Taking advantage of superconducting single-photon detectors optimized for quantum key distribution and ultralow-loss fiber, we can distribute secret keys at a maximum distance of 421 km and obtain secret key rates of 6.5 bps over 405 km.
我们提出了一种使用三态时间-bin 协议结合单-诱骗态方法的 2.5GHz 重复率量子密钥分发系统。利用针对量子密钥分发进行了优化的超导单光子探测器和超低损耗光纤，我们可以在最大距离为 421km 的情况下分发密钥，并在 405km 上获得 6.5bps 的密钥速率。
