低轨道量子卫星通信时分交换方案及性能分析

doi:10.3969/j.issn.1000-0801.2014.04.010

Abstract

Abstract:

Low orbit quantum satellite system is used to realize a worldwide secure communication. To solve the problem of multiple quantum users' access and information transmission in satellite coverage, a multi-beam time division quantum switching scheme was proposed, and a detailed description of the structure and working process of the time division quantum switch were given. In different time slot, the switch set up a quantum entanglement swapping channel for different users to transmit their quantum information. To overcome the delay in satellite-earth link and satellite-satellite link, a switching and transmission method was proposed based on quantum channel byte, which decreased the average qubit transmission delay for single time slot. Performance analysis shows that the number of time slot and the length of quantum channel byte have the key influence on the user number, the traffic and the call of loss. In certain channel conditions, by rational designing of these parameters, the quantum satellite communication system can meet the demanded service requirements.

Key words: quantum communication, satellite communication, time division multiple access, switching network, quantum entanglement

Guang Yang,Min Nie,Fan Jiang. Time Division Switching Scheme and Performance Analysis of Low Orbit Quantum Satellite Communication[J]. Telecommunications Science, 2014, 30(4): 68-73.

Figures/Tables 9

测量结果	光子t1、t4状态	幺正变换
\|ψ⁺>_t2,t3	$\frac{1}{\sqrt{2}} ({\| 0 〉}_{t 1} {\| 1 〉}_{t 4} + {\| 1 〉}_{t 1} {\| 0 〉}_{t 4}$	I-gate
\|ψ^->_t2,t3	$\frac{1}{\sqrt{2}} ({\| 1 〉}_{t 1} {\| 0 〉}_{t 4} - {\| 0 〉}_{t 1} {\| 1 〉}_{t 4}$	Z-gate
\|Φ⁺>_t2,t3	$\frac{1}{\sqrt{2}} ({\| 0 〉}_{t 1} {\| 1 〉}_{t 4} + {\| 1 〉}_{t 1} {\| 1 〉}_{t 4}$	X-gate
\|Φ^->_t2,t3	$\frac{1}{\sqrt{2}} ({\| 01 〉}_{t 1} {\| 1 〉}_{t 4} - {\| 0 〉}_{t 1} {\| 0 〉}_{t 4}$	（ZX）-gate

References 10

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Time Division Switching Scheme and Performance Analysis of Low Orbit Quantum Satellite Communication

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测量结果	光子t2状态	幺正变换
\|ψ⁺>	α_t\|0>_t2+β_t\|1>_t2	I-gate
\|Φ⁺>	α_t\|1>_t2+β_t\|0>_t2	X-gate
\|ψ^->	α_t\|0>_t2-β_t\|1>_t2	Z-gate
\|Φ^->	α_t\|1>_t2-β_t\|0>_t2	(ZX)-gate