Journal
PHYSICAL REVIEW A
Volume 88, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.88.022334
Keywords
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Categories
Funding
- NSFC [61272057, 61202434, 61170270, 61100203, 61003286, 61121061, 61202317]
- NCET [NCET-10-0260]
- Beijing Natural Science Foundation [4112040, 4122054]
- Fundamental Research Funds for the Central Universities [2012RC0612, 2011YB01]
- Scientific Research Fund of Heilongjiang Provincial Education Department [12521405]
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Based on the fundamental concept of quantum counterfactuality, we propose a protocol to achieve quantum private database queries, which is a theoretical study of how counterfactuality can be employed beyond counterfactual quantum key distribution (QKD). By adding crucial detecting apparatus to the device of QKD, the privacy of both the distrustful user and the database owner can be guaranteed. Furthermore, the proposed private-database-query protocol makes full use of the low efficiency in the counterfactual QKD, and by adjusting the relevant parameters, the protocol obtains excellent flexibility and extensibility.
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