Relations Between Characteristic Function, Positive P -Representation and Coherent Thermal State
Fan Hong‐Yi, Xing-Lei Xu · Communications in Theoretical Physics · 2007
We employ the coherent thermal states (a kind of entangled states) in thermal field dynamics to establish a complete entangled state formalism expressing pseudo-classical representations of density operator for light field. Especially, the relationship between the coherent thermal state and the characteristic function and the positive P representation in quantum optics theory are obtained.