Affiliation:
1. Guangxi University
2. Central South University
3. Beijing University of Posts and Telecommunications
Abstract
Excess noise in continuous-variable quantum key distribution systems usually results in a loss of key rate, leading to fatal security breaches. This paper proposes a long short-term memory time-sequence neural network to predict the key rate of the system while counteracting the effects of excess noise. The proposed network model, which can be updated with historical data, predicts the key rate of the future moment for the input time-sequence data. To increase the key rate, we perform a postselection operation to combat excess noise. We demonstrate the asymptotic security of the protocol against collective attacks with the numerical simulations using the quadrature phase-shift keying protocol, where some parameters have been optimized to resist excess noise. It provides a potential solution for improving the security of quantum communication in practical applications.
Funder
Key Research and Development Program of Hunan Province of China
National Natural Science Foundation of China
Scientific Research Fund of Hunan Provincial Education Department
Key Project of Scientific Research of Hunan Provincial Education Department
Natural Science Foundation of Hunan Province