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Multi-user quantum private query method

A query method, multi-user technology, applied in quantum computer, key distribution

Active Publication Date: 2020-07-17
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, there is currently no QPQ method that implements multiple user queries with only one round of execution

Method used

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  • Multi-user quantum private query method

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Experimental program
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Effect test

Embodiment

[0073] 1. Application example of multi-user QPQ method

[0074] Here, an example is used to further illustrate the bit extraction process of the method of the present invention. If P i The measurement result of is |0> and Bob's announcement is 1, she will know that Bob's initial state must be |1'> and the key bit is 1.

[0075] 2. Discussion

[0076] As analyzed above, the smaller θ is, the P i The smaller the success probability of the independent measurement and the success probability of the joint measurement of , it means better database privacy. However, the larger θ is, Bob gets P i The smaller the probability of conclusiveness in a qubit, the better the privacy of the user. Therefore, in the method of the present invention, database privacy and user privacy should be compromised by choosing an appropriate value for θ. It should be noted that no matter what θ is, when P i When detecting Bob's loyalty in step S7, the false initial state attack initiated by Bob can ...

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Abstract

According to a multi-user quantum private query method provided by the invention, the product state of the single photon state is used as an initial quantum resource, so that n users can query the data of the database at the same time. In the method of the invention, database privacy and user privacy should be compromised by selecting an appropriate value for theta. Due to the loyalty detection process of the database owner, a smaller theta can be preferentially selected to ensure better database privacy. Furthermore, the method of the present invention is loss tolerant, feasible in the case of large databases, robust to quantum storage attacks, and flexible.

Description

technical field [0001] The invention relates to the field of quantum cryptography. The invention designs a multi-user quantum private query method, which can realize that n users can simultaneously query data in a database. Background technique [0002] As the quantum version of Symmetrically private information retrieval (SPIR) [1], quantum private query (Quantum private query, QPQ) has become a research hotspot in the field of quantum cryptography [2] in recent years. The goal of QPQ is to enable users to get the data they want from the database under the premise of ensuring excellent user privacy and excellent database privacy. In 2008, Giovannetti et al. [3] proposed the first QPQ method, in which oracle operations on behalf of the database are imposed on the query state. Afterwards, its security analysis and the experimental realization of the principle verification are given in literature [4] and literature [5] respectively. In 2011, Olejnik [6] simplified the metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08G06F21/60G06F21/62G06N10/00
CPCH04L9/0852G06F21/6263G06F21/602G06N10/00
Inventor 叶天语李宏坤胡家莉
Owner ZHEJIANG GONGSHANG UNIVERSITY
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