Measurement equipment independent quantum key distribution method based on time slice auxiliary Bell state measurement

A technology of quantum key distribution and time segment, applied in the field of quantum communication, can solve problems such as low key generation rate

Active Publication Date: 2021-01-26
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Although MDI-QKD is easier to implement than other protocols, its key generation rate is relatively low, how to improve the key generation rate of MDI-QKD has become an important issue

Method used

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  • Measurement equipment independent quantum key distribution method based on time slice auxiliary Bell state measurement
  • Measurement equipment independent quantum key distribution method based on time slice auxiliary Bell state measurement
  • Measurement equipment independent quantum key distribution method based on time slice auxiliary Bell state measurement

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Embodiment Construction

[0078] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0079] Such as figure 1 As shown, the present invention provides a measurement device-independent quantum key distribution method based on time segment assisted Bell state measurement, comprising the following steps:

[0080] S1: User 1 and User 2 randomly select a linear basis and a diagonal basis to encode a single photon state with two degrees of freedom of momentum and polarization, and send the encoded single photon state to a third-party measurement device through ...

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Abstract

The invention discloses a measurement equipment independent quantum key distribution method based on time slice auxiliary Bell state measurement. The method comprises the following steps of a user 1 and a user 2 randomly selecting a single photon state and sending the single photon state to a third-party measurement device; performing hyper-entangled Bell state analysis on the single photon stateand publishing a measurement result; publishing selection of momentum and polarization degree of freedom bases, reserving the same coding information selected by any degree of freedom base, and discarding the coding information of which the selection of the bases on the two degrees of freedom is different; operating the coded information on different degrees of freedom to form an original key; repeating the steps till enough original keys are obtained; performing safety detection; forming a final security key. According to the method, the two-degree-of-freedom quantum state of the single photon is transmitted in the MDIQKD, and the two-degree-of-freedom quantum state of the single photon is used for encoding information, so the utilization rate and the code rate of the security key are effectively improved; and after the original key is obtained, quantum bit error rate analysis is carried out, so security of the transmission process is ensured.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, relates to a quantum key distribution technology, in particular to a measurement device-independent quantum key distribution method based on time segment assisted Bell state measurement. Background technique [0002] Quantum cryptography provides a reliable aid to the security of modern communications. As an important branch of quantum cryptography, quantum key distribution (QKD) can provide unconditionally secure shared keys for users separated by two places. Although quantum key distribution has unconditional security in theory, there are still some security loopholes in the actual QKD system due to the imperfection of devices, and there are many attack schemes for these security loopholes. [0003] To address the limitations of imperfect experimental equipment, the researchers developed device-independent quantum key distribution (DI-QKD). DI-QKD can defend against all possible...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
CPCH04L9/0858H04L9/0852
Inventor 盛宇波杨梦莹周澜钟伟
Owner NANJING UNIV OF POSTS & TELECOMM
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