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Polarization ambiguity elimination method during incomplete evolutionary reconstruction

A polarization state and ambiguity technology, applied in secure communication devices and key distribution, can solve problems such as ambiguity, inability to predict and compensate polarization state

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

However, when performing evolutionary reconstruction in a quantum key distribution system implemented according to BB84 and other protocols using two sets of non-orthogonal bases, ambiguous results will also appear, so it is impossible to predict and compensate the polarization state based on evolutionary reconstruction

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Embodiment Construction

[0023] Preferred embodiments of the present invention will be described below. While preferred embodiments of the present invention have been shown in the examples, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein.

[0024] A quantum key distribution system implemented according to the BB84 protocol, which uses two sets of non-orthogonal bases {|H>, |V>}, {|+>, |->} for encoding and decoding, and reconstructs the results according to the evolution The polarization state ambiguity elimination method when the evolution reconstruction is incomplete is used in the process of polarization state prediction and compensation, which includes the following steps:

[0025] (a) The sending end and the receiving end perform quantum communication, and the reconstructed polarization state is denoted as |H>;

[0026] (b) Obtain the average function of |H> in the current compensation period, denoted as ρ ...

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Abstract

The invention provides a polarization ambiguity elimination method during incomplete evolutionary reconstruction. When a quantum key distribution system is implemented in accordance with BB84 or the like using two groups of non-orthogonal protocols, the method of the invention can combine a polarization compensation step to eliminate the ambiguity of polarization evolution reconstructed from a measurement results of quantum communication, and provide accurate historical data for real-time polarization prediction and compensation.

Description

technical field [0001] The invention relates to a method for determining the evolution history of a certain polarization state according to communication data, especially a method for determining the real evolution curve from two possible evolution histories when the evolution reconstruction is incomplete in protocols such as BB84. Background technique [0002] At present, among the known quantum key distribution protocols, the BB84 protocol, the E91 protocol, and the decoy states above the two all use two sets of non-orthogonal bases for encoding and decoding. For a two-dimensional quantum state such as the polarization state, three sets of non-orthogonal basis measurements are required to be fully tomographic. When two sets of non-orthogonal basis measurements are used, there will be ambiguity in tomography, so it is necessary to take measures to overcome this ambiguity when performing polarization compensation based on tomography results in quantum key distribution system...

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 周华王艺敏赵继勇苏洋吴传信沈荟萍徐智勇蒲涛
Owner ARMY ENG UNIV OF PLA
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