Experimental quantum digital signature over 102 km

Hua-Lei Yin, Yao Fu, Hui Liu, Qi-Jie Tang, Jian Wang, Li-Xing You, Wei-Jun Zhang, Si-Jing Chen, Zhen Wang, Qiang Zhang, Teng-Yun Chen, Zeng-Bing Chen, and Jian-Wei Pan

Phys. Rev. A 95, 032334 – Published 30 March 2017

Abstract

Quantum digital signature (QDS) is an approach to guarantee the nonrepudiation, unforgeability, and transferability of a signature with information-theoretical security. Previous experimental realizations of QDS relied on an unrealistic assumption of secure channels and the longest distance is several kilometers. Here, we have experimentally demonstrated a recently proposed QDS protocol without assuming any secure channel. Exploiting the decoy state modulation, we have successfully signed a one-bit message through an up to 102-km optical fiber. Furthermore, we continuously run the system to sign the longer message “USTC” with 32 bits at the distance of 51 km. Our results pave the way towards the practical application of QDS.

Received 31 July 2016

DOI:https://doi.org/10.1103/PhysRevA.95.032334

Physics Subject Headings (PhySH)

Quantum communication Quantum information processing Quantum state engineering

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Hua-Lei Yin^1,2, Yao Fu^1,2, Hui Liu^1,2, Qi-Jie Tang^1,2, Jian Wang^1,2, Li-Xing You³, Wei-Jun Zhang³, Si-Jing Chen³, Zhen Wang³, Qiang Zhang^1,2,*, Teng-Yun Chen^1,2,†, Zeng-Bing Chen^1,2,‡, and Jian-Wei Pan^1,2,§

¹Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
²The CAS Center for Excellence in QIQP and the Synergetic Innovation Center for QIQP, University of Science and Technology of China, Hefei, Anhui 230026, China
³State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

^*qiangzh@ustc.edu.cn
^†tychen@ustc.edu.cn
^‡zbchen@ustc.edu.cn
^§pan@ustc.edu.cn

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Issue

Vol. 95, Iss. 3 — March 2017

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covering atomic, molecular, and optical physics and quantum information