200 公里量级的测量设备无关量子密钥分发。

Measurement-device-independent quantum key distribution over 200 km.

机构信息

National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, Shanghai Branch, University of Science and Technology of China, Hefei, Anhui 230026, China and CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, Shanghai Branch, University of Science and Technology of China, Hefei, Anhui 230026, China.

State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.

出版信息

Phys Rev Lett. 2014 Nov 7;113(19):190501. doi: 10.1103/PhysRevLett.113.190501. Epub 2014 Nov 6.

DOI:10.1103/PhysRevLett.113.190501

PMID:25415890

Abstract

Measurement-device-independent quantum key distribution (MDIQKD) protocol is immune to all attacks on detection and guarantees the information-theoretical security even with imperfect single-photon detectors. Recently, several proof-of-principle demonstrations of MDIQKD have been achieved. Those experiments, although novel, are implemented through limited distance with a key rate less than 0.1 bit/s. Here, by developing a 75 MHz clock rate fully automatic and highly stable system and superconducting nanowire single-photon detectors with detection efficiencies of more than 40%, we extend the secure transmission distance of MDIQKD to 200 km and achieve a secure key rate 3 orders of magnitude higher. These results pave the way towards a quantum network with measurement-device-independent security.

摘要

测量设备无关量子密钥分发（MDIQKD）协议不受所有检测攻击的影响，并保证了即使在单光子探测器不完善的情况下也能实现信息论安全性。最近，已经实现了几个 MDIQKD 的原理验证演示。这些实验虽然新颖，但仅在有限的距离内实施，其密钥率小于 0.1 比特/秒。在这里，我们通过开发一个 75MHz 时钟速率的全自动和高度稳定的系统以及具有超过 40%探测效率的超导纳米线单光子探测器，将 MDIQKD 的安全传输距离扩展到 200km，并实现了安全密钥率提高了 3 个数量级。这些结果为具有测量设备无关安全性的量子网络铺平了道路。