COHERENT INFORMATION ON THERMAL RADIATION NOISE CHANNEL: AN APPROACH OF INTEGRAL WITHIN ORDERED PRODUCT OF OPERATORS
Chen Xiao-yu (陈小余)ab, Qiu Pei-liang (仇佩亮)a
a Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China; b Division of Physics, China Institute of Metrology, Hangzhou 310034, China
Abstract An analytical expression is given to the coherent information of the thermal radiation signal transmitted over the thermal radiation noise channel, one of the most essential quantum Gaussian channels. Focusing on the single normal mode of the thermal radiation signal and noise, we resolve the entangled state density operator, which characterizes quantum information transmission, into a direct product of two parts, with each part being a thermal radiation density operator. The calculation is aided by the technique known as "integral within ordered product of operators".
Received: 16 February 2001
Revised: 19 April 2001
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60002003).
Cite this article:
Chen Xiao-yu (陈小余), Qiu Pei-liang (仇佩亮) COHERENT INFORMATION ON THERMAL RADIATION NOISE CHANNEL: AN APPROACH OF INTEGRAL WITHIN ORDERED PRODUCT OF OPERATORS 2001 Chinese Physics 10 779
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