Abstract
Quantum private queries can commonly protect important information in a good many of domains, such as finance, business, military, which use quantum effects to achieve unprecedented classical private queries. However, quantum state can be easily affected by environmental noise, which affects the actual effect of quantum private queries. This paper developed a new quantum private query protocol based on four qubits logical Bell state to resist the collective-dephasing noise. The symmetric private information retrieval problem, which is the most influential problem in the process of quantum private query, was solved well by quantum oblivious transfer. It introduces the construction of four qubits logical Bell state. The quantum private query protocol innovates the quantum key distribution process by using the four qubits logical Bell state as the measurement base to measure the logical qubits, and ensures the function of quantum oblivious transmission. The protocol cannot only resist the noise influence of the communication process, but also ensure the security of both sides of the communication.
Highlights
Bennett and Brassard proposed the first QKD protocol which is known as BB84 protocol using single-photon polarization states in 1984 [1]
After 30 years’ development, the quantum cryptography protocol has been proposed for many territories including quantum key distribution protocol [2,3,4,5], quantum secret sharing protocol [6], quantum direct communication protocol [7], quantum teleportation [8] and quantum private query protocol what we will study in this paper
The quantum oblivious key distribution protocol has been proposed by predecessors, which is a good solution to the Symmetric Private Information Retrieval (SPIR) problem
Summary
Bennett and Brassard proposed the first QKD protocol which is known as BB84 protocol using single-photon polarization states in 1984 [1]. One of the most important problems is the Symmetric Private Information Retrieval (SPIR) problem This problem mainly involves two aspects: the first aspect is the database security problem, i.e., Bob does not want Alice to obtain any information other than the k pieces of information she wants to retrieve; the other aspect is user privacy, i.e., Alice does not want Bob to know what information she wants to query. The quantum oblivious key distribution protocol has been proposed by predecessors, which is a good solution to the SPIR problem. On this basis, this paper improves the process of the oblivious key distribution, to improve the quantum private query protocol. The logical Bell state (i.e., 4 qubit decoherence-free state) [11] is used to overcome the collective-dephase noise and improve the quantum private query protocol. Database security and user privacy can be guaranteed
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