Cavity QED-based quantum privacy comparison method

A quantum and privacy technology, applied in the field of quantum cryptography, to achieve the effect of high qubit efficiency, resistance to external attacks and participant attacks

Active Publication Date: 2016-11-23
嘉兴市顺凯鹿科技有限公司
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  • Application Information

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Problems solved by technology

Lo [30] pointed out that it is impossible to safely evaluate the equality function in the two-party case

Method used

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  • Cavity QED-based quantum privacy comparison method
  • Cavity QED-based quantum privacy comparison method
  • Cavity QED-based quantum privacy comparison method

Examples

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Embodiment

[0135] 1. Application example of quantum privacy comparison method

[0136] here to and The method of the present invention is illustrated by way of example. Without loss of generality, suppose The ith product state prepared by TP TP will Feed into the single mold cavity described above. Driven by a classical field, two atoms and Simultaneously react with this single mode cavity. TP selects the rabbi frequency and response time to satisfy Ωt=π and λt=π / 4. so, will undergo the evolution shown in equation (6). and become entangled after evolution. After they fly out of the single-mode cavity, the TP will Send to Alice(Bob). Then, Alice(Bob) uses the Z-base to measure the atom Without loss of generality, suppose The measurement result of is |e>, then according to formula (6), The measurement result of should be |g>. therefore, is 1, is 0. Alice(Bob) calculation get Then, Alice (Bob) publicly tells TP prepared according to step S2 The i...

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Abstract

The invention discloses a cavity QED-based quantum privacy comparison method by virtue of adequate utilization of an evolution law of atoms in cavity QED. A third party is allowed to wrongly act according to his / her willing but cannot conspire with any one of two users. According to the method, a two-atom product state but not an entangled state is taken as an initial quantum resource which is only needed to be applied to single atom measurement of the two users; unitary operation and quantum entanglement quantum entanglement operation are unnecessary in the method of the invention; the equality of one bit of each user can be compared by virtue of one two-atom product state in each round of comparison; the external attack and the attack of a participant can be resisted; particularly, the secrets and even a comparison result of the two users cannot be known by the third party; and furthermore, the quantum comparison efficiency reaches up to 50%.

Description

technical field [0001] The invention relates to the field of quantum cryptography. The invention designs a quantum privacy comparison method based on the cavity QED, and uses the evolution law of atoms in the cavity QED to solve the equality comparison problem of two user secrets. Background technique [0002] In the past two decades, quantum information processing has greatly aroused the interest of researchers worldwide and achieved considerable development. Quantum cryptography, first proposed by Bennett and Brassard [1] in 1984, is a development product of quantum information processing in the field of cryptography. It can achieve unconditional security based on the principles of quantum mechanics, such as Heisenberg's uncertainty principle, quantum non-cloning theorem, etc., which has attracted the attention of many researchers. So far, it has established many branches, such as Quantum Key Distribution (Quantum Key Distribution, QKD) [1-8], Quantum Secret Sharing (Qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
CPCH04L9/0852H04L9/0858
Inventor 叶天语
Owner 嘉兴市顺凯鹿科技有限公司
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