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Continuous variable quantum key distribution system and phase compensation method thereof

A quantum key distribution and phase compensation technology, applied in the field of continuous variable quantum key distribution system and its phase compensation, can solve the problems of phase drift, easy to be affected by environmental factors, phase and drift, etc. Environmental and system noise, the effect of reducing the bit error rate

Active Publication Date: 2013-01-09
SHANGHAI JIAODA INTELLECTUAL PORPERTY MANAGEMENT CO LTD +1
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Problems solved by technology

[0010] The purpose of the present invention is to provide a continuous variable quantum key distribution system to solve the technical problem that the continuous variable quantum key distribution system in the prior art is susceptible to phase drift due to environmental factors
[0011] Another object of the present invention is to provide a phase compensation method for a continuous variable quantum key distribution system to solve the technical problem of phase drift caused by environmental factors in the existing continuous variable quantum key distribution system

Method used

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  • Continuous variable quantum key distribution system and phase compensation method thereof
  • Continuous variable quantum key distribution system and phase compensation method thereof
  • Continuous variable quantum key distribution system and phase compensation method thereof

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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] see figure 1 , a continuous variable quantum key distribution system, including a sending end and a receiving end, the sending end includes a sending end optical path part and a sending end controller module, and the receiving end includes a receiving end optical path part and a receiving end controller module, wherein,

[0048] The optical path at the sending end includes: a laser, a first beam splitter, a first polarization controller, an amplitude controller, a first phase modulator, an attenuator and a coupler connected in sequence, wherein the beam splitter is also connected to the coupler; The laser is used to generate laser light. After the laser light comes out, it is divided into two beams by the first beam splitter, one beam of signal light and one beam of local oscillator light. One beam of signal light passes through a polarization controller, an a...

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Abstract

The invention relates to a continuous variable quantum key distribution system and a phase compensation method thereof. The method comprises the following steps that: a sending end determines to send a phase compensation frame and determines a value of frequency A in an insertion signal of the phase compensation frame; the sending end sends the phase compensation frame and receives (A-1) signal frames; a receiving end samples an output signal of a coherent detector and extracts the phase compensation frame; the receiving end calculates a voltage value to be compensated according to the phase compensation frame, compensates the compensated voltage value to (A-1) key frame phases through a second phase modulator to eliminate environment and system noises and stores compensated (A-1) key frames into an original key file; the receiving end receives the subsequent phase compensation frame, extracts the phase compensation frame, and repeatedly performs the operation; and the sending end sends an interrupt transmission signal, and after receiving the interrupt transmission signal, the receiving end stops receiving, so key distribution is finished. The invention has the advantages of low bit error rate and reliable communication.

Description

technical field [0001] The invention relates to the technical field of optical fiber quantum communication, in particular to a continuous variable quantum key distribution system and a phase compensation method thereof. Background technique [0002] Quantum cryptography is a new type of cryptographic system based on classical cryptographic systems and quantum physical systems. The security of this cryptographic system is guaranteed by the intrinsic properties of quantum itself. The quasi-principle guarantees that quantum cryptography has unconditional security and detectability against eavesdropping, which makes quantum cryptography have good performance and prospects. [0003] In 1969, the idea of ​​quantum cryptography was first proposed by S. Wiesner, but it has not received much attention. In 1984, American scientist C.H.Bennett and Canadian cryptographer G..Brassard proposed the first quantum key distribution protocol in the world—the BB84 protocol. This protocol was w...

Claims

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Application Information

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IPC IPC(8): H04L9/08
Inventor 申泽源肖俊俊代文超何广强曾贵华
Owner SHANGHAI JIAODA INTELLECTUAL PORPERTY MANAGEMENT CO LTD
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