Abstract
A novel quantum private database query protocol is proposed, based on passive round-robin differential phase-shift quantum key distribution. Compared with previous quantum private database query protocols, the present protocol has the following unique merits: (i) the user Alice can obtain one and only one key bit so that both the efficiency and security of the present protocol can be ensured, and (ii) it does not require to change the length difference of the two arms in a Mach-Zehnder interferometer and just chooses two pulses passively to interfere with so that it is much simpler and more practical. The present protocol is also proved to be secure in terms of the user security and database security.
Highlights
A novel quantum private database query protocol is proposed, based on passive round-robin differential phase-shift quantum key distribution
In quantum private database query (QPDQ) protocols, the user Alice wants to obtain an item in Bob’s database without leaking which item she wants, and Bob does not want Alice to get any information about other items
The quantum key distribution (QKD)-based QPDQ model has attracted a great deal of attention and many theoretical and experimental attempts have been made at devising QKD-based QPDQ protocols[10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]
Summary
Round-Robin Differential Phaseshift Quantum Key Distribution received: 27 May 2016 accepted: 22 July 2016. Compared with previous quantum private database query protocols, the present protocol has the following unique merits: (i) the user Alice can obtain one and only one key bit so that both the efficiency and security of the present protocol can be ensured, and (ii) it does not require to change the length difference of the two arms in a Mach-Zehnder interferometer and just chooses two pulses passively to interfere with so that it is much simpler and more practical. It is difficult to change the length difference of the two arms in a MZI with high speed using the current technology To solve this problem, Guan et al.[29] proposed an alternative scheme, i.e., the passive round-robin differential phase-shift (PRRDPS) QKD scheme which does not require to change the length difference of the two arms in a MZI and just chooses two pulses passively to interfere with so that it is much simpler and more practical. The proposed protocol is more practical than the work by Liu et al.[22] and is its extension
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