Optimized communication strategies with binary coherent states over phase noise channels
Optimized communication strategies with binary coherent states over phase noise channels
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DOI：
10.1038/s41534-019-0177-4
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发表时间：
2019-07-31
影响因子：
7.6
通讯作者：
Becerra, F. E.
中科院分区：
文献类型：
--
作者：
DiMario, M. T.;Kunz, L.;Becerra, F. E.
光通信中可实现的信息传输速率由通信信道的物理特性（例如固有信道噪声）决定。玻色相位噪声信道是一类非高斯信道，是量子信息和光通信中的重要噪声模型。然而，虽然高斯信道上的通信的基本限制已被广泛研究，玻色相位噪声信道上的通信的属性还没有得到很好的理解。在这里，我们提出并实验证明了优化的通信策略的概念，通过相位噪声信道的通信，以提高信息传输超出了传统的调制和检测方法是可能的。两个关键成分是广义星座的相干状态，标准的开关键控和二进制相移键控格式之间的插值，和非高斯测量的基础上的光子数分辨检测的相干位移信号。对于一个给定的功率约束和信道噪声强度，这些新的策略依赖于联合优化的输入字母表和测量，以提供增强的通信能力，在非高斯信道的错误率以及互信息方面的特点。
The achievable rate of information transfer in optical communications is determined by the physical properties of the communication channel, such as the intrinsic channel noise. Bosonic phase noise channels, a class of non-Gaussian channels, have emerged as a relevant noise model in quantum information and optical communication. However, while the fundamental limits for communication over Gaussian channels have been extensively studied, the properties of communication over Bosonic phase noise channels are not well understood. Here we propose and demonstrate experimentally the concept of optimized communication strategies for communication over phase noise channels to enhance information transfer beyond what is possible with conventional methods of modulation and detection. Two key ingredients are generalized constellations of coherent states that interpolate between standard on-off keying and binary phase-shift keying formats, and non-Gaussian measurements based on photon number resolving detection of the coherently displaced signal. For a given power constraint and channel noise strength, these novel strategies rely on joint optimization of the input alphabet and the measurement to provide enhanced communication capability over a non-Gaussian channel characterized in terms of the error rate as well as mutual information.