中国物理B ›› 2014, Vol. 23 ›› Issue (3): 30303-030303.doi: 10.1088/1674-1056/23/3/030303
刘堂昆a, 单传家a, 刘继兵a, 范洪义b
Liu Tang-Kun (刘堂昆)a, Shan Chuan-Jia (单传家)a, Liu Ji-Bing (刘继兵)a, Fan Hong-Yi (范洪义)b
摘要: The evolution of a pure coherent state into a chaotic state is described very well by a master equation, as is validated via an examination of the coherent state’s evolution during the diffusion process, fully utilizing the technique of integration within an ordered product (IWOP) of operators. The same equation also describes a limitation that maintains the coherence in a weak diffusion process, i.e., when the dissipation is very weak and the initial average photon number is large. This equation is dρ/dt=-κ[a+aρ-a+ρa-aρa++ρaa+]. The physical difference between this diffusion equation and the better-known amplitude damping master equation is pointed out.
中图分类号: (Quantum mechanics)