Optimal detection with squeezed state for quantum communication in thermal noise channel

Yao-Tseng Wang, Rong Zhang, B. Lu, Xiaoguang Chen
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Abstract

Pulse position modulation (PPM) is widely adopted in free space optical transmission, and is a candidate for deep space transmission, also in quantum form. The change of signal photon number probability distribution is caused by thermal noise in quantum PPM format. We prove that squeezing improves state discrimination at fixed channel energy, and also in the presence of thermal noise. Then we compare the difference between coherent state and squeezed state in thermal noise and reveal that the squeezed state has better robustness. It is shown that for the fixed channel energy, the larger the squeezed parameter is not the better. For some given total channel energies, we further study and get the optimal squeezed parameter. Finally, combined with the actual situation, the simulation results show that, as a resource for noisy quantum communication channels, the squeezing operation can improve the quality of deep space quantum communication system with PPM.
热噪声信道中量子通信压缩态最优检测
脉冲位置调制(PPM)在自由空间光传输中被广泛采用,也是量子形式的深空传输的候选方案。在量子PPM格式中,热噪声会引起信号光子数概率分布的变化。我们证明了在固定通道能量和热噪声存在的情况下,压缩可以改善状态识别。然后比较了相干态和压缩态在热噪声中的差异,发现压缩态具有更好的鲁棒性。结果表明,对于固定通道能量,压缩参数并不是越大越好。对于给定的总通道能量,我们进一步研究并得到了最优压缩参数。最后,结合实际情况,仿真结果表明,压缩操作作为有噪声量子通信信道的资源,可以提高PPM深空量子通信系统的质量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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