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Laser & Optoelectronics Progress

Performance Optimization Strategy for Quantum Satellite Communication Based on Entanglement Feedback Control

聂敏 Nie Min, 张彦朋 Zhang Yanpeng, 杨光 Yang Guang, 张美玲 Zhang Meiling, 裴昌幸 Pei Changxing

Published Jan 1, 2021• 1 citation
Publisher
DOI
10.3788/lop202158.0527002

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Quantum satellite communication has the natural advantages of strong survival reliability and wide coverage, and is currently a research hotspot in the field of communication at home and abroad. The successful launch of the "Mozi" scientific experimental satellite has laid the foundation for the construction of the quantum space-earth integrated communication network. In order to further improve the communication performance of the quantum satellite-ground link, a tuning strategy based on quantum coupled associative feedback control (QCAFC) is proposed in this paper. QCAFC estimates the state information of atoms by measuring the photons leaked in the optical cavity, and adjusts the controller to change the spin state of the atoms in the optical cavity. The evolution of the system is studied, the influence of the QCAFC system on the performance parameters of the satellite-ground quantum communication is analyzed, and the simulation is verified. The simulation results show that in the amplitude damped channel, the QCAFC system can significantly improve the channel capacity and coherence. When transmitting in the plasma environment, when the particle radius is 5, when the transmission distance between the satellite and the earth increases from 50km to 200km, the bit error rate of the system without QCAFC is increased from 7.34×10-3 to 21.93×10-3, and the bit error rate of the system with QCAFC is increased from 4.81×10-3 to 14.72×10-3. Simulation results show that the use of QCAFC system has a significant improvement in the performance of quantum satellite communication.
In the atmospheric boundary layer far from the mainland, the complex climate environment, strong sea winds, and intermediate currents pose challenges to ocean satellite and starship communication. Especially in quantum communication, the interference of ionosphere, space plasma, and ice crystal particles can affect the stability and security of communication, which has become a research hotspot in the current field of starship communication. This article proposes an innovative method to optimize starship communication based on Quantum Entanglement Adaptive Control (QEAC). This article establishes the relationship between environmental factors and fidelity, bit error rate, and adaptive adjustment strategies. It compares the system performance parameters before and after the introduction of QEAC. This innovative method can improve the fidelity of quantum satellite communication systems under natural environmental interference through quantum entanglement adaptive control. Especially in the amplitude damping and depolarisation channels, the application of QEAC has significantly improved the stability of quantum starship communication. To verify the effectiveness of the proposed method, this paper conducted performance simulation experiments and achieved satisfactory results. Therefore, the optimization strategy based on quantum entanglement adaptive control proposed in this article is innovative and practical, providing a novel solution for solving the problems faced by ocean satellite communication. This study is of great significance for improving the stability and security of quantum starship communication under complex oceanic and meteorological conditions.
Quantum satellite communication is a communication method with strong security and large coverage area, and it has become a hot research topic at home and abroad. The successful launch of the quantum satellite has laid an important foundation for future integrated quantum communication. When further studying the communication performance between quantum satellite-ground links, it is found that atmospheric particulate matter has a significant impact on quantum satellite communication performance. In this paper, by analyzing the extinction characteristics of atmospheric particles, a mathematical model of particle concentration, transmission distance and satellite-earth quantum energy is established, and the influence of atmospheric particles on communication parameters, bit error rate and entanglement degree is analyzed. The simulation results show that with the increase of particle concentration, the performance indicators of quantum satellite communication are affected to a certain extent. As the concentration of particulate matter in the atmosphere continues to decrease, the energy of the optical quantum signal continues to increase, and the quantum bit error rate increases with the increase in the concentration of atmospheric particulate matter and the transmission distance. The degree of quantum entanglement decreases with the increase of the particle size of atmospheric particles, and increases with the increase of visibility. The luminosity of light quantum will decrease with the increase of transmission height and the increase of surface particle concentration. By studying the optimization and adjustment strategy of quantum signal based on fidelity quantum relay satellite, simulation ensures the feasibility of this strategy. It is observed that the research in this paper can provide the necessary theoretical reference for the development of quantum space-ground integrated communication network.