Bidirectional Communication Quantum Database Privacy Query Method Based on Bell State

Abstract

The invention discloses a two-way communication quantum database privacy query method based on the Bell state. The method includes that the database randomly sends particle pairs in four Bell states to the query user, and the query user randomly performs measurement or reflection on the received particle pairs. operation, database selection Z Base or Bell base measurement, the database announces two binary bits according to the measurement results, the query user infers the key bits, the database randomly selects half of the keys for wiretapping detection, and the database and query users use the post-processing method to obtain the final key based on the remaining keys . The invention improves the efficiency of qubit usage through the two-way communication between the database and the user based on the Bell state, simplifies the generation process of the query key, realizes the user's private query of the database, and prevents internal and external eavesdroppers from obtaining the key.

Description

technical field [0001] The invention belongs to the technical field of quantum privacy query, and in particular relates to a Bell state-based two-way communication quantum database privacy query method. Background technique [0002] Academician Pan Jianwei, the chief scientist of the quantum satellite, introduced that the quantum satellite independently developed by my country has broken through a series of key technologies, including high-precision tracking and aiming, satellite-ground polarization state maintenance and base vector correction, and space-borne quantum entanglement sources. In the early morning of August 16, 2016, China's first quantum science experiment satellite named "Mozi" embarked on an interstellar journey. It carries the mission of being the first to explore the possibility of satellite-to-earth quantum communication, and will verify the authenticity of quantum theory on a spatial scale for the first time. The advent of quantum communication systems h...

AI Technical Summary

Problems solved by technology

[0007] 1. In the actual environment of the quantum privacy query protocol, single photons do not have the ability to resist noise, and it takes a lot of resources to detect noise and eliminate the impact of noise on the transmission of photons;

[0008] 2. The one-way quantum privacy query protocol can only realize one-way verification, and one party verifies whether the message transmitted by the other party is safe;

[0009] 3. The existing quantum privacy query scheme requires both the database and the user to have complete quantum functions, such as preparing Bell states, measuring Bell states, unitary operations, and even quantum memory, which is difficult to implement in practice;

[0010] 4. The measurement results are diverse and difficult to distinguish with the classic 0,1 binary bits, which increases the implementation overhead

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