光纤作为量子信道的性能

本文研究光纤作为量子信道在密波分复用时模式间非线性干扰造成的信道噪声的性质 ,和光纤量子信道在该噪声下的经典容量 .用位移算符方法计算量子噪声的累加 ,同时建立了有衰减和噪声时的信道的量子模型 .本文论证如果干扰是各其他模式独立而均等的贡献的叠加 ,信道噪声是热辐射噪声类型的 ,并求出了在给定参数的情况下的经典容量

Performance of optical fiber as a quantum channel

In this paper we investigate the noise properties and classical capacity of an optical fiber which is considered as a quantum channel. The noise is due to nonlinear crosstalk between the modes of dense wavelength division multiplexing system. With displacement operator method the total quantum noise is obtained, and a quantum channel model with attenuation and noise is proposed. We conclude that the noise of the mode is of thermal radiation type if all other modes contribute an equally crosstalk to the one considered. Classical capacity is obtained for given parameters of channel.