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Semi-quantum private query method without stimulating measurement capability of classic user

A query method, a technology for measuring capability, applied in the field of quantum cryptography

Active Publication Date: 2020-05-15
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the improved QPQ method of Yu et al. [13] is not semi-quantum

Method used

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  • Semi-quantum private query method without stimulating measurement capability of classic user
  • Semi-quantum private query method without stimulating measurement capability of classic user

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0071] 1. Application example of SQPQ method

[0072] Here, an example is used to further illustrate the bit extraction process of the method of the present invention. suppose a i =0,b i =0. Bob generates a single qubit in the quantum state |+> and sends it to Alice. Alice enters CTRL mode and returns the received quantum state |+> to Bob. Bob uses the Z basis to measure this qubit, assuming his measurement result is |1>. Bob announces a classic bit 1. Based on what she did and Bob's announcement, Alice knows that Bob's measurement must be |1> and the key bit is 0.

[0073] 2. Discussion

[0074] In the method of the invention, qubits are sent back and forth. Therefore, Trojan horse attacks, including invisible photon eavesdropping attacks [16] and delayed photon Trojan horse attacks [17-18] should be considered. To overcome invisible photon eavesdropping attacks, Alice inserts a filter in front of her device to filter out photon signals with unreasonable wavelengths ...

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Abstract

The invention provides a semi-quantum private query method without stimulating the measurement capability of a classical user, and by utilizing the law of quantum mechanics, a user can secretly queryone piece of data from a database on the premise of ensuring the user privacy and the database privacy. The method provided by the invention has the following characteristics: (1) only one quantum state is adopted as an initial quantum state; (2) a classical user is not required to execute measurement operation; (3) the method is deception-sensitive, which means that if database privacy or user privacy is invaded, attack behaviors can be detected.

Description

technical field [0001] The invention relates to the field of quantum cryptography. The present invention designs a semi-quantum private query method that does not stimulate the classical user's measurement ability, uses the law of quantum mechanics, and realizes that the user can secretly query a data from the database under the premise that the privacy of the user and the privacy of the database are guaranteed. Background technique [0002] Quantum private query (QPQ), as the quantum version of Symmetrically private information retrieval (SPIR) [1], is an important branch of quantum cryptography [2]. It focuses on solving the following problem: using the laws of quantum mechanics, under the premise that user privacy and database privacy are guaranteed, users want to secretly query a piece of data from the database. Here, user privacy means that if a disloyal database owner tries his best to know which data of his database the user wants to know, his deception will inevitab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08G06F16/245
CPCH04L9/0852G06F16/245
Inventor 叶天语李宏坤胡家莉
Owner ZHEJIANG GONGSHANG UNIVERSITY
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