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Photon polarization state compensation method based on evolutionary historical reconstruction

A technology of photon polarization and compensation method, applied in photon quantum communication and key distribution, which can solve the problems of increasing system cost and complexity, inability to use, and reducing system efficiency.

Active Publication Date: 2018-06-15
ARMY ENG UNIV OF PLA
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Problems solved by technology

The polarization self-compensation scheme based on the bidirectional optical path structure has security loopholes and cannot be used
Interruptive polarization compensation is easy to implement, but takes time slots for key distribution, reduces system efficiency, and has poor ability to track fast polarization changes
The time division / wavelength division multiplexing polarization compensation scheme estimates the polarization state of the quantum optical signal by using reference light, which improves the polarization tracking performance of the system, but increases the cost and complexity of the system
The polarization compensation method based on quantum state reconstruction reconstructs the measured polarization state from the measurement results of the quantum optical signal, and achieves real-time polarization compensation without relying on the reference light. However, when this method reconstructs the polarization state The average approximation is used, which cannot accurately reflect the change of the polarization state in the approximate time interval, nor can it fully utilize the historical information of the polarization state to estimate the current polarization state, so the accuracy of compensation and the ability to track fast polarization changes are still relatively limited

Method used

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Embodiment Construction

[0042] In the following, the present invention will be further described in conjunction with the embodiments.

[0043] A quantum key distribution system implemented in accordance with the six-state protocol, its working frequency is 100MHz, and the measured parameter A N The system uses a photon polarization state compensation method based on evolution history reconstruction, which includes the following steps:

[0044] (a) The sender and receiver of quantum communication use the same three sets of non-orthogonal basis {|H> , |V> }, {|+> , |-> }, {|R> , |L> } For encoding and decoding, the probability of using the three groups is the same, which is 1 / 3;

[0045] (b) The repetition period of quantum communication transmission and reception is T=0.01μs. Through calibration, the base quantum bit error rate QBER of the system is measured B =1%, set the expected long-term average quantum bit error rate QBER of the system polarization compensation T = 5%;

[0046] (c) The sender and receiver...

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Abstract

The invention provides a photon polarization state compensation method based on evolutionary historical reconstruction; a novel nyquist method for performing polarization state evolution reconstruction in quantum key distribution is applied to polarization state real-time prediction and compensation, so that the precision of polarization state compensation based on the measurement result of a quantum optical signal and the capability of tracking fast polarization change are improved.

Description

Technical field [0001] The invention relates to a photon polarization state compensation technology, in particular to a quantum communication system that needs to stabilize the photon polarization state, in particular to a photon polarization state compensation method based on evolutionary history reconstruction. Background technique [0002] At present, the polarization compensation schemes used in the well-known quantum key distribution system mainly include two-way optical path polarization self-compensation, interrupted compensation, time division multiplexing compensation and wavelength division multiplexing compensation [several polarization compensation technologies for optical fiber quantum key distribution systems, Wang Jian, Progress in Laser and Optoelectronics], and the recent polarization compensation method based on quantum state reconstruction [Patents 201510228202.6 and 201510575570.8]. The polarization self-compensation scheme based on the bidirectional optical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
CPCH04B10/70H04L9/0852
Inventor 周华王艺敏吴传信苏洋赵继勇沈荟萍徐智勇蒲涛
Owner ARMY ENG UNIV OF PLA
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