Bidirectional communication quantum database privacy query method based on Bell state

Abstract

The invention discloses a bidirectional communication quantum database privacy query method based on a Bell state. The method comprises the steps that a database randomly sends particle pairs in fourBell states to a query user, the query user randomly executes measurement or reflection operation on the received particle pair; wherein the database selects Z-based or Bell-based measurement, the database announces two binary bits according to a measurement result, the query user deduces to obtain a key bit, the database randomly selects a half key for eavesdropping detection, and the database and the query user obtain a final key according to the remaining keys by using a post-processing method. According to the invention, based on the Bell state, through bidirectional communication betweenthe database and the user, the quantum bit use efficiency is improved, the query key generation process is simplified, the privacy query of the user for the database is realized, and internal and external eavesdroppers cannot obtain 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...

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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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