Robust and adaptable quantum key distribution network without trusted nodes

Author:

Fan-Yuan Guan-Jie12ORCID,Lu Feng-Yu12,Wang Shuang12ORCID,Yin Zhen-Qiang12,He De-Yong12,Chen Wei12ORCID,Zhou Zheng12,Wang Ze-Hao12ORCID,Teng Jun12,Guo Guang-Can12,Han Zheng-Fu12ORCID

Affiliation:

1. University of Science and Technology of China

2. State Key Laboratory of Cryptology

Abstract

Quantum key distribution (QKD) networks are promising to serve large numbers of users with information-theoretic secure communication. In QKD networks, the detection-safe protocol, termed measurement-device-independent (MDI) QKD, can naturally enhance realistic security by supporting untrusted measurement nodes. However, the environmental disturbances to quantum states degrade the performance of multi-user communication. Here we propose an MDI-QKD networking scheme with robustness against environmental disturbance and adaptability to multi-user access, where more than two users can generate keys simultaneously regardless of aligning reference frames and compensating channel disturbance on polarization. To achieve this, we introduce the reference-frame-independent protocol as well as a polarization-compensation-free method, design a multi-user measurement unit, and combine it with original two-user units. The scheme is experimentally demonstrated for the improvement of network robustness and adaptability in multi-user scenarios, and the time and device costs of disturbance compensation can be saved from O ( N ) to O ( 1 ) for an N-user network.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

China Postdoctoral Science Foundation

Anhui Initiative in Quantum Information Technologies

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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