Monitoring method for continuous-variable quantum key distribution system

A quantum key distribution and variable technology, which is applied in the interception field of the continuous variable quantum key distribution system, can solve the problems such as the poor effect of the continuous variable quantum key distribution system, and achieve the effect of good concealment and noise elimination

Active Publication Date: 2014-05-07
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0020] The technical problem to be solved by the present invention is the problem that the current interception method for the continuous variable quantum key distribution system is not effective

Method used

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  • Monitoring method for continuous-variable quantum key distribution system
  • Monitoring method for continuous-variable quantum key distribution system
  • Monitoring method for continuous-variable quantum key distribution system

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Embodiment Construction

[0050] The invention utilizes the wavelength-dependent characteristics of the beam splitter in the balanced zero-beat detector, proposes two interception methods, implements effective interception on the continuous variable quantum key distribution system, and proposes a specific anti-intercept method to enhance the continuous variable Practical Security of Quantum Key Distribution Systems.

[0051] The 50:50 beam splitter BS is an important part of the balanced zero-beat detector. Once its beam splitting ratio deviates from the balanced beam splitting characteristics of 50:50, the output of the balanced zero-beat detector will be seriously affected, especially for Measurement aspects of vacuum noise. Beam splitter is a very commonly used device in optical communication. It is often made by fused taper process. It has the advantages of simple process and low price, so it is widely used. A typical feature of the beam splitter made by this process is the wavelength correlation,...

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Abstract

The invention discloses a monitoring method for a continuous-variable quantum key distribution system. The method is used for monitoring a quantum channel between a sender and a receiver of the continuous-variable quantum key distribution system. The receiver comprises a balanced homodyne detector. The balanced homodyne detector comprises a 50:50 BS and an AM. According to the non-ideality of relevance between the transmittance and the wave length of the 50:50 BS of the balanced homodyne detector, two kinds of de-noising light are introduced besides spurious signal light and spurious local oscillation light, and therefore the extra noise caused by acquiring and resending behaviors of a monitor is eliminated.

Description

technical field [0001] The invention belongs to the field of quantum secret communication, in particular to the interception of continuous variable quantum key distribution system. Background technique [0002] Quantum key distribution technology enables remote communication parties to safely share keys. The security of the key can reach unconditional security in the sense of information theory, so it has received extensive attention since it was proposed in 1984. [0003] Different from the single-photon quantum key distribution protocol, the continuous variable quantum key distribution encodes the key information on the X component and the P component of the coherent state or squeezed state, which are defined as and Corresponding to the real and imaginary parts of the complex amplitude of the electric field, where and They are the annihilation operator and generation operator in quantum optics, respectively. Due to the non-reciprocity of the annihilation operator a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
Inventor 王双黄靖正银振强陈巍李宏伟周政何德勇韩正甫郭光灿
Owner UNIV OF SCI & TECH OF CHINA
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