Improved and Formal Proposal for Device Independent Quantum Private Query

Recently, Maitra et al (Phys. Rev. A, 2017) proposed a protocol towards Device Independent Quantum Private Query (DI-QPQ) by exploiting a local CHSH game on top of the QPQ protocol proposed by Yang et al (Quant. Inf. Process., 2014). However, their test doesn't provide any certification for the devices in client's side. In the present draft, we propose a novel device independent QPQ scheme. Our technique exploits a tilted version of original CHSH game and proper testing of POVM devices and hence it guarantees device independence. Further, we provide formal security proofs and obtain an upper bound in information leakage to both dishonest client as well as dishonest server.

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