Arpita Maitra

We propose a novel Quantum Private Query (QPQ) scheme using EPR-pairs with full Device Independent (DI) certification. To the best of our knowledge, this is the first time we provide such a full DI-QPQ protocol. Our proposed scheme exploits self-testing of shared EPR-pairs along with the self testing of projective measurement operators in a setting where the parties don't trust each other. To certify full DI, our scheme also exploits a technique to self-test a particular class of POVM elements that are used in the protocol. This makes the DI-testing of this proposed scheme slightly different from the traditional DI-QKD scheme. Further, we provide formal security analysis and obtain an upper bound on the maximum cheating probabilities for both dishonest client as well as dishonest server.