Multi-Bit Quantum Private Query |
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Authors: | SHI Wei-Xu LIU Xing-Tong WANG Jian TANG Chao-Jing |
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Institution: | Information Security Laboratory, School of Electronic Science and Engineering, National University of Defense Technology of China, Changsha 410073, China |
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Abstract: | Most of the existing Quantum Private Queries (QPQ) protocols provide only single-bit queries service, thus have to be repeated several times when more bits are retrieved. Wei et al.'s scheme for block queries requires a high-dimension quantum key distribution system to sustain, which is still restricted in the laboratory. Here, based on Markus Jakobi et al.'s single-bit QPQ protocol, we propose a multi-bit quantum private query protocol, in which the user can get access to several bits within one single query. We also extend the proposed protocol to block queries, using a binary matrix to guard database security. Analysis in this paper shows that our protocol has better communication complexity, implementability and can achieve a considerable level of security. |
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Keywords: | quantum communication quantum cryptography |
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