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Double-field quantum key distribution method and system safe to actual signal source

A quantum key distribution and signal source technology, applied in the field of quantum key distribution, can solve the problems of low security and low coding rate, and achieve the effects of increasing transmission distance, high coding rate and improving coding rate.

Active Publication Date: 2022-04-12
NANJING UNIV
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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to provide a double-field quantum key distribution method and system that is safe to the actual signal source, which solves the problem of excessive coding rate existing in the existing quantum key distribution protocol under actual equipment conditions. low or low security issues

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  • Double-field quantum key distribution method and system safe to actual signal source
  • Double-field quantum key distribution method and system safe to actual signal source
  • Double-field quantum key distribution method and system safe to actual signal source

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0046] like Figure 1 to Figure 3 As shown, the present invention proposes a double-field quantum key distribution method that is safe to an actual signal source, comprising the following steps:

[0047] (1) The first transmitter and the second transmitter respectively prepare weakly coherent light pulses as signal states, and encode and phase-modulate the respective prepared signal states, and at the same time, the first transmitter and the second transmitter record the phase-modulated Coding information and base vector information;

[0048] The specific process of encoding phase modulation is as follows: the selection of phase modulation is , there is a selection of basis vectors in this method, where the phase modulation Defined as the X base vector, the phase modulation Defined as the Y base vector, the first sender and the second sender respective...

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Abstract

The invention discloses a double-field quantum key distribution method and system safe to an actual signal source, quantum key distribution only needs to use weak coherent optical pulses, meanwhile, an intermediate measurement equipment end only needs to carry out interference operation, in the safety analysis process, a basic architecture that measurement equipment is irrelevant to quantum key distribution is adopted, and therefore the safety of the quantum key distribution is improved. A unique protocol implementation process is used to represent the existing actual vulnerability of the sending end, so that the requirement of actual security can be met, and a transmission channel does not need to be monitored. On the basis of the advantages, the key transmission distance is increased, and a higher code rate can still be obtained under the condition of long-distance transmission of the quantum key; meanwhile, on the basis of the advantages, the scheme has extremely high adaptability and relatively high practicability for actual operation.

Description

technical field [0001] The invention relates to the technical field of quantum key distribution, in particular to a two-field quantum key distribution method and system that are safe for actual signal sources. Background technique [0002] Based on the basic principles of quantum mechanics, quantum key distribution can provide absolutely secure communication between two parties, and solve the security loopholes of classical key distribution that are easily cracked based on computational complexity. Nowadays, quantum key distribution has made extensive research progress both theoretically and experimentally. Some quantum key distribution protocols have entered the practical field. Although quantum key distribution has achieved some tentative results in the field of practical application, there are still greater loopholes in its distance from real practical application that have not been taken into account. The most important of these is the gap between the actual transmissi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
Inventor 尹华磊顾杰陈增兵
Owner NANJING UNIV
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