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Higher security and lower failure probability have always been people's pursuits in quantum-oblivious-key-transfer-based private query (QOKT-PQ) protocols since Jacobi et al. [Phys. Rev. A 83, 022301 (2011)] proposed the first protocol of this kind. However, higher database security generally has to be obtained at the cost of a higher failure probability, and vice versa. Recently, based on a round-robin differential-phase-shift quantum key distribution protocol, Liu et al. [Sci. China-Phys. Mech. Astron., 58, 100301 (2015)] presented a private query protocol (RRDPS-PQ protocol) utilizing ideal single-photon signal which realizes both ideal database security and zero failure probability. However, ideal single-photon source is not available today, and for large database the required pulse train is too long to implement. Here, we reexamine the security of RRDPS-PQ protocol under imperfect source and present an improved protocol using a special &#x201C;low-shift and addition&#x201D; (LSA) technique, which not only can be used to query from large database but also retains the features of &#x201C;ideal database security&#x201D; and &#x201C;zero-failure&#x201D; even under weak coherent source. Finally, we generalize the LSA technique and establish a generic QOKT-PQ model in which both &#x201C;ideal database security&#x201D; and &#x201C;zero failure&#x201D; are achieved via acceptable communications.

A Generic Construction of Quantum-Oblivious-Key-Transfer-Based Private Query with Ideal Database Security and Zero Failure