Experimental quantum secret sharing based on phase encoding of coherent states  

作　　者：Ao Shen Xiao-Yu Cao Yang Wang Yao Fu Jie Gu Wen-Bo Liu Chen-Xun Weng Hua-Lei Yin Zeng-Bing Chen 

机构地区：[1]National Laboratory of Solid State Microstructures and School of Physics,Collaborative Innovation Center of Advanced Microstructures,NanjingUniversity,Nanjing 210093,China [2]Henan Key Laboratory of Quantum Information and Cryptography,SSF IEU,Zhengzhou 450000,China [3]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第6期139-147,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.12274223);the Natural Science Foundation of Jiangsu Province(Grant No.BK20211145);the Fundamental Research Funds for the Central Universities(Grant No.020414380182);the Key Research and Development Program of Nanjing Jiangbei New Aera(Grant No.ZDYD20210101);the Program for Innovative Talents and Entrepreneurs in Jiangsu(Grant No.JSSCRC2021484);the Program of Songshan Laboratory(Included in the management of Major Science and Technology Program of Henan Province)(Grant No.221100210800)。

摘　　要：Quantum secret sharing(QSS)is one of the basic communication primitives in future quantum networks which addresses part of the basic cryptographic tasks of multiparty communication and computation.Nevertheless,it is a challenge to provide a practical QSS protocol with security against general attacks.A QSS protocol that balances security and practicality is still lacking.Here,we propose a QSS protocol with simple phase encoding of coherent states among three parties.Removing the requirement of impractical entangled resources and the need for phase randomization,our protocol can be implemented with accessible technology.We provide the finite-key analysis against coherent attacks and implement a proof-of-principle experiment to demonstrate our scheme’s feasibility.Our scheme achieves a key rate of 85.3 bps under a 35 d B channel loss.Combined with security against general attacks and accessible technology,our protocol is a promising candidate for practical multiparty quantum communication networks.

关 键 词：quantum secret sharing coherent state phase encoding coherent attack FINITE-SIZE 

分 类 号：O413[理学—理论物理] TN918[理学—物理]