Plug-and-play reference-system-independent double-field quantum key distribution protocol implementation method

A quantum key distribution, plug-and-play technology, applied in the field of communication, to achieve the effect of increasing the distance

Active Publication Date: 2021-06-08
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the existing TF-QKD protocol, and propose a plug-and-play dua

Method used

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  • Plug-and-play reference-system-independent double-field quantum key distribution protocol implementation method
  • Plug-and-play reference-system-independent double-field quantum key distribution protocol implementation method
  • Plug-and-play reference-system-independent double-field quantum key distribution protocol implementation method

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Embodiment 1

[0028] The quantum key distribution QKD protocol plays an important role in the communication network. Although the two-field quantum key distribution TF-QKD protocol and the improved version of the TF-QKD protocol have broken through the limit of the coding rate-distance, these protocol systems are in the light source preparation There are high requirements for the consistency of the preparation of the double light source, and the preparation of the double light source may bring about security vulnerabilities, resulting in a decrease in the key rate of the quantum key distribution system. At the same time, the above-mentioned quantum key QKD protocol system does not use the reference frame-independent RFI protocol combined with the plug-and-play structure, so reference frame alignment and an additional phase polarization calibration system are required, which greatly increases the complexity of the system and further leads to quantum key distribution. A decrease in the key rat...

Embodiment 2

[0055]The RFI-TF-QKD protocol implementation method of the plug-and-play type reference frame-independent dual-field quantum key distribution RFI-TF-QKD is the same as embodiment 1, and the construction quantum key distribution system described in step (1), see figure 1 , including the following:

[0056] (1a) Determine the structure of the plug-and-play double-field quantum key distribution TF-QKD system: the present invention involves two legal communication users, Alice and Bob, and an untrusted third party Charlie. The TF-QKD system with dual-field quantum key distribution is equipped with two communication user branches and a measurement end; the third party Charlie at the measurement end uses a single light source to prepare light pulses and splits them into two paths through the beam splitter BS2. The polarizing beam splitter PBS is sent to two communication user optical branches; the two communication user optical branches adopt the same structure, and the optical puls...

Embodiment 3

[0061] The implementation method of the plug-and-play double-field quantum key distribution protocol independent of the reference frame is the same as that of embodiment 1-2, and the communication users described in step (3) monitor and modulate the optical pulse, see figure 1 , including the following:

[0062] (3a) The monitoring module overcomes the Trojan horse attack: In the present invention, the monitoring module is jointly realized by the optical beam splitter BS3 and the photodetector ID. Since the third-party Charlie at the measurement end uses a single light source to prepare light pulses, and sends the light pulses to communication users through the optical fiber channel, there may be an eavesdropper Eve who replaces the photon number distribution of the light pulses on the channel with an arbitrary distribution to obtain More information. Therefore, in the present invention, Alice and Bob, both communication users, obtain the photon number distribution PND of thei...

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Abstract

The invention discloses a reference-system-independent plug-and-play double-field quantum key distribution protocol implementation method, and solves the problems of inconsistent preparation of double light sources, misalignment of reference systems, incapability of automatically compensating phase and polarization and incapability of breaking through the SKC limit in an existing QKD protocol system. The method comprises the following implementation steps that: a single light source quantum key distribution system is constructed; a communication user monitors, modulates and encodes the optical pulse; the third-party Charlie performs Bell state measurement of photons and discloses a result; alice and Bob of communication users screen keys and carry out parameter estimation; and post-processing on the secret key is finally carried out. According to the invention, a double-field quantum key distribution system in which a single light source generates light pulses is constructed, a plug-and-play structure is combined in the system, an RFI protocol irrelevant to a reference system is applied, two communication users do not need to align the reference system, and phase and polarization compensation is automatically carried out, so that the complexity of a protocol system is reduced, the range of secure communication is expanded, and the method is used for quantum communication.

Description

technical field [0001] The invention belongs to the technical field of communication, and mainly relates to quantum key distribution in secure communication, specifically a method for implementing a plug-and-play double-field quantum key distribution protocol, which can be used for actual quantum secure communication and reduces the complexity of the quantum communication system The speed greatly improves the distance of quantum secure communication. Background technique [0002] In today's information age, communication security is an important content that people pay attention to, especially the security of data transmission. Originating from the requirement for confidentiality of communication, quantum communication came into being. Quantum communication is based on the single-photon non-cloning theorem and entanglement properties for information transmission, which has unconditional security that traditional communication methods do not have. Quantum communication incl...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04L9/00H04B10/70H04B10/85
CPCH04L9/0858H04L9/002H04B10/70H04B10/85
Inventor 朱畅华林姣姣权东晓易运晖何先灯赵楠陈南裴昌幸
Owner XIDIAN UNIV
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