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

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...

AI Technical Summary

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

Images