Bit error rate and uncertainty joint feedback photon polarization state compensation method

A technology of photon polarization and uncertainty rate, which is applied in photon quantum communication and key distribution, can solve problems such as inaccurate compensation, and achieve the effect of increasing system cost

Inactive Publication Date: 2015-08-19
PLA UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiency that the polarization compensation method of the existing quantum key distribution system cannot accurately compensate two non-orthogonal photon polarization states while taking into account efficiency, distance and cost. The present invention proposes a Photon Polarization Compensation Method Based on Joint Feedback of Bit Error Rate and Uncertainty Rate

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  • Bit error rate and uncertainty joint feedback photon polarization state compensation method

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] Such as figure 1 As shown, the present invention represents the photon polarization state expected to be received by the quantum key distribution system as a point on the Poincaré sphere, the angle between the real-time polarization state and the desired polarization state corresponds to the current bit error rate, and the real-time polarization state and the desired polarization state The angle between the non-orthogonal polarization states corresponds to the current uncertainty rate. By counting the bit error rate of the photon polarization state to its own polarization state at the sending end and the receiving end, the real-time polarization state is positioned on the Poincaré sphere on the circle where the angle between the expected polarization state and the desired polarization state corresponds to the aforementioned bit error rate. The r...

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Abstract

The invention relates to a bit error rate and uncertainty joint feedback photon polarization state compensation method. The method includes the following steps that: a quantum key distribution system publicizes N bits in an original key of which the length is M every time which are used for bit error rate statistics, wherein N is far smaller than M; the quantum key distribution system publicizes an N'-bit pseudo key in an effective detection sequence where the original key is located, wherein the N'-bit pseudo key is used for uncertainty statistics; and simultaneous compensation of two non-orthogonal polarization states |+> and |H> can be realized through utilizing photon polarization states of the bit error rate and the uncertainty on the estimating receiving end of a Poincare sphere. With the bit error rate and uncertainty joint feedback photon polarization state compensation method of the invention adopted, the two non-orthogonal photon polarization states can be accurately compensated in real time under the situation that the communication efficiency and distance of the quantum key distribution system are not affected and the cost of the system is not increased.

Description

technical field [0001] The invention relates to a photon polarization state compensation technology, in particular to a quantum key distribution system using polarization coding, and specifically to a photon polarization state compensation method for joint feedback of bit error rate and uncertainty rate. Background technique [0002] At present, the polarization compensation schemes used in the known quantum key distribution system mainly include two-way optical path polarization self-compensation, interruption compensation, time division multiplexing compensation and wavelength division multiplexing compensation [Several polarization compensation technologies of optical fiber quantum key distribution system, Wang Jian, Advances in Lasers and Optoelectronics]. The polarization self-compensation scheme based on the two-way optical path structure can achieve polarization self-compensation only by using the optical path structure without the need for external equipment. However...

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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 周华朱勇苏洋赵继勇徐智勇武欣嵘何敏王艺敏吴传信王衍波项鹏
Owner PLA UNIV OF SCI & TECH
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