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Entropy 2016, 18(5), 163;

Quantum Private Query Protocol Based on Two Non-Orthogonal States

College of Information Security Engineering, Chengdu University of Information Technology, Chengdu 610225, China
Author to whom correspondence should be addressed.
Academic Editor: Gerardo Adesso
Received: 15 December 2015 / Revised: 14 April 2016 / Accepted: 20 April 2016 / Published: 3 May 2016
(This article belongs to the Special Issue Entanglement Entropy)
Full-Text   |   PDF [884 KB, uploaded 3 May 2016]   |  


We propose a loss tolerant quantum private query (QPQ) protocol based on two non-orthogonal states and unambiguous state discrimination (USD) measurement. By analyzing a two-point attack by a third party, we find that our protocol has a stronger ability to resist external attacks than G-protocol and Y-protocol. Our protocol requires a smaller number of compressions than that in G-protocol (Gao et al., Opt. Exp. 2012, 20, 17411–17420) and Y-protocol (Yan et al. Quant. Inf. Process. 2014, 13, 805–813), which means less post-processing. Our protocol shows better database security and user privacy compared with G-protocol. View Full-Text
Keywords: quantum private query; two-point attack; conclusive bits quantum private query; two-point attack; conclusive bits

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Chang, Y.; Zhang, S.; Han, G.; Sheng, Z.; Yan, L.; Xiong, J. Quantum Private Query Protocol Based on Two Non-Orthogonal States. Entropy 2016, 18, 163.

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