A Phase Reference Signal Preparation Method Suitable for Continuous Variable Quantum Key Distribution
A quantum key distribution and phase reference technology, applied in the field of continuous variable quantum key distribution phase reference signal preparation, to achieve the effects of improving signal-to-noise ratio, improving performance, and reducing errors
Active Publication Date: 2020-12-25
BEIJING UNIV OF POSTS & TELECOMM
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[0004] Aiming at the problem of phase noise estimation in the continuous variable quantum key distribution system, the present invention proposes a continuous variable quantum key distribution phase reference signal preparation method based on the coordination of local oscillator light and signal light. The amplitude of the signal light is controlled cooperatively, thereby improving the signal-to-noise ratio of the phase reference signal
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[0027] The present invention improves the signal-to-noise ratio of the phase reference signal of the continuous variable quantum key distribution system through the coordinated control of the amplitude of the local oscillator light and the signal light, and the specific steps are as follows:
[0028] 1. Divide the local oscillator light and signal light into a reference part and a data part, and select the ratio of the two parts according to the size of the phase noise introduced by different system structures and devices, so as to ensure that the phase noise change between two adjacent reference parts in the system within the tolerance range.
[0029] 2. The reference part and data part of the local oscillator light and the part corresponding to the signal light need to achieve one-to-one timing correspondence, and the time delay is zero. By measuring the optical path of the local oscillator light and signal light reaching the mixer, the delay difference between the two signa...
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The present invention discloses a preparation method of phase reference signals suitable for continuous variable quantum secret key distribution. The objective of the invention is to improve a signalto noise ratio of phase reference signals and reduce estimation errors of phase noise. Amplitudes of local oscillator light and signal light in a continuous variable quantum secret key distribution system are controlled to commonly form phase reference signals. The local oscillator light and the signal light comprise a data portion and a reference portion, the data portion is configured to load secret key information, and the reference portion is configured to load phase reference information. The coordination control of the amplitudes of local oscillator light and signal light are performed to improve a signal to noise ratio of a measurement result of the phase reference portion so as to reduce the statistics errors of a phase estimation process, improve the precision of phase compensation and reduce an influence of phase noise on continuous variable quantum secret key distribution. The preparation method provided by the invention can correspondingly reduce the number of the phase reference signals, can improve the data utilization rate of the system and improve the safety secret key rate of the system.
Description
technical field [0001] The invention relates to the preparation of a quantum key distribution light source, in particular to a continuous variable quantum key distribution phase reference signal, in particular to a continuous variable quantum key distribution phase reference signal preparation method based on the coordination of local oscillator light and signal light. Background technique [0002] Continuously variable quantum key distribution (CV-QKD) has the advantages of high single-pulse security code rate and high commercialization of components. It has received extensive attention from all parties and has developed rapidly. In the actual implementation process of CV-QKD system, the compensation of phase noise is always a key issue restricting the performance of the system. There are two common schemes for the existing CV-QKD system. One is that the local oscillator light and signal light are multiplexed into the same optical fiber for transmission, and the other is th...
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IPC IPC(8): H04L9/08
CPCH04L9/0852
Inventor 张一辰赵一甲喻松郭弘
Owner BEIJING UNIV OF POSTS & TELECOMM