One-way transmission quantum database privacy query method

Abstract

The invention discloses a one-way transmission quantum database privacy query method, comprising the steps that a query user randomly generates a mixed sequence of a single photon and a Bell state; the database selects half of particles for eavesdropping detection; the database selects a Z base or a Bell base for measurement; the database announces two binary bits according to a measurement result; the query user obtains a key bit at a certain probability; and the database and the query user obtain a final key by using a post-processing method. According to the one-way transmission quantum database privacy query method, the query user only needs to send the quantum information to the database owner once, so that the privacy query of the user on the database can be realized, and the realization method is simpler; and on the basis of ensuring completion of privacy query, the quantum bit use efficiency is improved, and no matter whether an internal eavesdropper or an external eavesdroppercannot obtain additional key information.

Description

Technical field [0001] The invention belongs to the technical field of quantum privacy query, and specifically relates to a one-way transmission method for privacy query of a quantum database. Background technique [0002] Quantum secure communication technology has moved from laboratory demonstration to industrialization. In cities, the metropolitan area quantum network communication constructed through optical fiber has begun to be applied in practice, and my country has achieved an international leading position in metropolitan area optical fiber quantum communication. After years of hard work, China has ranked among the world's first-class quantum information research, and it has also been in the forefront of the world in quantum communication technology. It has completed the construction of large-scale quantum communication metropolitan area networks such as Hefei and Jinan, and the large-scale "Beijing-Shanghai trunk line" The optical fiber quantum communication backbone n...

AI Technical Summary

Problems solved by technology

[0006] 2. Qubits are susceptible to interference from other factors: single photons are affected by noise in the actual quantum transmission channel, which may cause some interference to the measurement results; external and internal eavesdroppers will also affect the measurement results

[0007] 3. In the existing quantum privacy query scheme, the results of measuring particles are diverse, and it is difficult to distinguish them with classical information 0, 1

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