Performance Improvement Method of Continuous Variable Quantum Key Distribution System Based on AO Unit Discrete Modulation
A technology for quantum key distribution and system performance, which is applied in the field of performance improvement of continuous variable quantum key distribution systems based on discrete modulation of AO units, and can solve the problems of laser carrier signal wavefront and amplitude distortion, system performance degradation, and poor negotiation efficiency. , to reduce the wavefront aberration, simplify the decoding process, and achieve the effect of high negotiation efficiency
Active Publication Date: 2021-08-17
国科蓝盾(北京)科技有限公司
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[0004] The purpose of the present invention is to provide a method for improving the performance of a continuous variable quantum key distribution system based on AO unit discrete modulation, to solve the problem that the traditional CVQKD key extraction process is complicated, the negotiation efficiency is poor, and it cannot be applied to farther communication distances
Low performance of the discrete modulation CVQKD protocol in a complex communication environment; and when using a COC system, the wavefront and amplitude of the laser carrier signal are easily distorted by turbulence, resulting in a decrease in system performance
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[0066] Alice and Bob share an entangled two-mode squeezed vacuum state, two modes A and B 0 The orthogonal variance of is denoted by V. Alice puts half of the entangled state B 0 It is sent to Bob through a complex communication channel with random fluctuations in transmittance and ξ over noise. Bob utilizes a practical homodyne detector to perform coherent detection. This practical homodyne detector can be modeled by a beam splitter with transmission γ, while its electronic noise can be modeled by el The Einstein Podolski Rosen state is modeled. At the Alice end, the preparation of the quantum state can be measured by heterodyne detection with two canonical components, namely X A and P A to model. The entanglement-based CVQKD protocol is equivalent to the Prepare-Measure (PM) protocol, in which Alice generates a quantum state with a laser pulse source, and by using the displacement variance V A =V-1. Subsequently, the quantum state is sent to Bob, and Bob uses the max...
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The invention discloses a performance improvement method for a continuous variable quantum key distribution system based on AO unit discrete modulation, which belongs to the field of quantum communication technology and includes the following steps: step A: the sending end performs quantum key generation and transmission; step B: the receiving end performs Parameter estimation, quantum key reception, detection and processing of received signals, and finally a pair of security keys are obtained. The present invention greatly simplifies the decoding process through the discretely modulated CVQKD, enabling it to maintain high negotiation efficiency and thus being applicable to longer communication distances. In addition, when the Greenwood frequency is fixed, by adjusting the closed-loop control bandwidth and coherence length of the AO unit, higher mixing efficiency can be obtained, and then the performance of the discrete modulation CVQKD protocol in complex communication environments can be greatly improved.
Description
technical field [0001] The invention belongs to the technical field of quantum communication, in particular to a method for improving the performance of a quantum key distribution system based on AO unit discrete modulation and continuous variable. Background technique [0002] Quantum key distribution (QKD) allows two authenticated parties, usually referred to as Alice and Bob, to share a synchronized secret key in an untrusted environment. There are two approaches in the field of QKD: one is discrete variable (DV) QKD and the other is continuous variable (CV) QKD. Different from DVQKD, CVQKD is based on the measurement of the quartic property of the field, and utilizes high-efficiency homodyne (or heterodyne) detection technique to realize its measurement. Among them, DVQKD mainly loads the key information with two physical quantities of phase and polarization, while CVQKD loads the key information with the orthogonal component of the quantum state of the light field. Co...
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IPC IPC(8): H04L9/08
CPCH04L9/0819H04L9/0838H04L9/0852
Inventor 郭迎谭欣蔡浩唐瑞明邓晗曹昱周正春莫伟毛堉昊毛云
Owner 国科蓝盾(北京)科技有限公司