Year
Month
(Peer-Reviewed) Decoy-State Method for Quantum-Key-Distribution-Based Quantum Private Query
Bin Liu 刘斌 ¹, Shuang Xia ², Di Xiao 肖迪 ², Wei Huang 黄伟 ³, Bingjie Xu 徐兵杰 ⁴, Yang Li 李扬 ⁴
¹ State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China , Beijing China 100876
北京邮电大学 网络与交换技术国家重点实验室
² College of Computer Science, Chongqing University, Chongqing 400044, China , Chongqing China Chongqing
中国 重庆 重庆大学计算机学院
³ Institute of Southwestern Communication, NO.8 Chuang Ye Road, Hi-tech District , Chengdu Sichuan Province China 610041
中国 四川 成都 西南通信研究所
⁴ Science and Technology on Communication Security Laboratory, Institute of Southwestern Communication, Chengdu 610041, China , Chengdu China Sichuan
中国 四川 成都 西南通信研究所 保密通信重点实验室
Abstract

The quantum private query (QPQ) is a quantum solution for the symmetrically private information retrieval problem. We study the security of quantum-key-distribution-based QPQ with weak coherent pulses. The result shows that multiphoton pulses have posed a serious threat to the participant's privacy in QPQ protocols.

Then we propose a decoy-state method that can help the honest participant detect the attack by exploiting multiphoton pulses and improving the key distillation process to defend against such attack. The analysis demonstrates that our decoy-state method significantly improves the security of the QPQ with weak coherent pulses, which solves a major obstacle in the practical application of the QPQ.
Decoy-State Method for Quantum-Key-Distribution-Based Quantum Private Query_1
Decoy-State Method for Quantum-Key-Distribution-Based Quantum Private Query_2
Decoy-State Method for Quantum-Key-Distribution-Based Quantum Private Query_3
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