Continuous variable quantum key distribution data coordination FPGA heterogeneous acceleration method

Abstract

The invention discloses a continuous variable quantum key distribution data coordination FPGA heterogeneous acceleration method, which solves the parallel acceleration problem of the SEC (slice error correction, spline error correction) protocol for data coordination in the CV-QKD system. The SEC protocol adopts multiple Level decoding method, LDPC decoding is performed at each level, and the decoding algorithm adopts logarithmic domain decoding. The parity check matrix of the LDPC code is a random sparse matrix, and decoding requires multiple BP (Belief Propagation) information iterations to correct the wrong code. The check matrix of the LDPC code used in the data coordination of the CV‑QKD system is large in scale, reaching 200,000 x 200,000, which makes storage difficult, decoding speed is very slow, and the system time is prolonged, which affects practicability. This program adopts the processing mode of CPU+FPGA heterogeneous computing based on OpenCL, parallelizes the LDPC decoding process, and proposes a static cross bidirectional circular linked list to store the check matrix of huge LDPC codes, thereby improving the The rate of the entire data coordination scheme.

Description

technical field [0001] The invention belongs to the technical field of data processing, and in particular relates to a continuous variable quantum key distribution data coordination FPGA heterogeneous acceleration method. Background technique [0002] Continuous-variable Quantum Key Distribution (CV-QKD) is one of the emerging research directions of quantum secure communication systems in recent years. It is a point-to-point secure communication technology based on quantum states, which has the characteristics of strong confidentiality, relatively strong and stable anti-noise ability of the light source, and strong realizability. [0003] The basic flow of the CV-QKD system is as follows: figure 1 As shown, the steps of CV-QKD include: [0004] 1) The Alice sender uses a continuous variable light field to generate a random number x that obeys a Gaussian distribution A and p A , sent to the receiver Bob through the quantum communication channel. [0005] 2) After receivi...

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Problems solved by technology

[0012] 1. When the code length is short, the minimum error correction signal-to-noise ratio of the Gaussian channel is high, and the SEC data coordination is 7.5dB, resulting in low efficiency of data coordination, so that the communication distance of the CV-QKD system cannot be improved

[0013] 2. Studies have shown that in order to prolong the communication distance of the CV-QKD system, the LDPC code length for data coordination should reach more than 200,000. Extended, reduced utility of the CV-QKD system

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