Journal
ENTROPY
Volume 18, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/e18050163
Keywords
quantum private query; two-point attack; conclusive bits
Categories
Funding
- National Natural Science Foundation of China [61402058, 61572086]
- Fund for Middle and Young Academic Leaders of Chengdu University of Information Technology [J201511]
- Science and Technology Support Project of Sichuan Province of China [2013GZX0137]
- Fund for Young Persons Project of Sichuan Province of China [12ZB017]
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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.
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