基于相位编码的与参考系无关的量子密钥分发的原理验证实验。

Proof-of-principle experiment of reference-frame-independent quantum key distribution with phase coding.

机构信息

1] Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

出版信息

Sci Rep. 2014 Jan 9;4:3617. doi: 10.1038/srep03617.

DOI:10.1038/srep03617

PMID:24402550

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3885882/

Abstract

We have demonstrated a proof-of-principle experiment of reference-frame-independent phase coding quantum key distribution (RFI-QKD) over an 80-km optical fiber. After considering the finite-key bound, we still achieve a distance of 50 km. In this scenario, the phases of the basis states are related by a slowly time-varying transformation. Furthermore, we developed and realized a new decoy state method for RFI-QKD systems with weak coherent sources to counteract the photon-number-splitting attack. With the help of a reference-frame-independent protocol and a Michelson interferometer with Faraday rotator mirrors, our system is rendered immune to the slow phase changes of the interferometer and the polarization disturbances of the channel, making the procedure very robust.

摘要

我们已经在 80 公里的光纤中演示了一种基于原理验证的参考系无关相位编码量子密钥分发（RFI-QKD）实验。在考虑有限密钥边界的情况下，我们仍然实现了 50 公里的距离。在这种情况下，基态的相位通过一个缓慢时变的变换相关。此外，我们为具有弱相干光源的 RFI-QKD 系统开发并实现了一种新的诱骗态方法，以对抗光子数分裂攻击。借助于参考系无关协议和带有法拉第旋转镜的迈克尔逊干涉仪，我们的系统能够抵御干涉仪的缓慢相位变化和信道的偏振干扰，从而使整个过程非常稳健。