In this paper, we present a quantum-key-distribution (QKD)-based quantum private query (QPQ) protocol utilizing single-photon signal of multiple optical pulses. It maintains the advantages of the QKD-based QPQ, i.e., easy to implement and loss tolerant. In addition, different from the situations in the previous QKD-based QPQ protocols, in our protocol, the number of the items an honest user will obtain is always one and the failure probability is always zero. This characteristic not only improves the stability (in the sense that, ignoring the noise and the attack, the protocol would always succeed), but also benefits the privacy of the database (since the database will no more reveal additional secrets to the honest users). Furthermore, for the user's privacy, the proposed protocol is cheat sensitive, and for security of the database, we obtain an upper bound for the leaked information of the database in theory. quantum private query, quantum key distribution, single-photon signal PACS number(s): 03.67.Dd, 03.65.Ud Liu B, Gao F, Huang W, et al. QKD-based quantum private query without a failure probability.
In 2015, Liu et al. proposed a QKD-based QPQ protocol based on the RRDPS-QKD protocol, which is the first QKD-based QPQ protocol with zero failure probability REF .
QKD-based quantum private query without a failure probability
Sci China-Phys Mech Astron, 2015, 58: 100301
Physics