Free-Space Optical Quantum BPSK Communications in Turbulent Channels
Renzhi Yuan, Julian Cheng · 2018
The performance of free-space optical quantum communications deteriorates due to the presence of atmosphere turbulence. In this paper, the P-function of a coherent state passing through a turbulent atmosphere channel in the presence of thermal noise is derived using the additive property of the thermal noise channel. The analytical form of the density operator for this turbulent coherent state and its corresponding matrix representation in Fock basis is deducted. Using this matrix representation of density operator for turbulent coherent state, the error probability of optical quantum communication system for binary phase shift keying is analyzed.