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arXiv 2002.05766quant-phphysics.optics
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光通信中的量子极限

Quantum Limits in Optical Communications

Konrad Banaszek, Ludwig Kunz, Michał Jachura, Marcin Jarzyna

摘要:

本教程回顾了Holevo容量限制作为一种通用工具,用于分析各种光通信场景中的最终传输速率,从传统的光放大光纤链路到具有功率受限光信号的自由空间通信。采用正则加性高斯白噪声模型描述光信号的传输。当在传播过程中获得的噪声的功率谱密度与每单位时间带宽区域的载波频率下的单个光子的能量相比很小时,Holevo极限基本上超过标准香农极限。一般的结果说明了在光子饥饿制度的有效的通信策略的讨论。

英文摘要:

This tutorial reviews the Holevo capacity limit as a universal tool to analyze the ultimate transmission rates in a variety of optical communication scenarios, ranging from conventional optically amplified fiber links to free-space communication with power-limited optical signals. The canonical additive white Gaussian noise model is used to describe the propagation of the optical signal. The Holevo limit exceeds substantially the standard Shannon limit when the power spectral density of noise acquired in the course of propagation is small compared to the energy of a single photon at the carrier frequency per unit time-bandwidth area. General results are illustrated with a discussion of efficient communication strategies in the photon-starved regime.

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