非线性增光子热态的非经典特性

本文从描述驻波激光场与囚禁离子相互作用的非线性Jaynes-Cummings模型出发,引入一种新的量子态,即非线性增光子热态.采用理论分析和数值计算相结合的方法,研究了Lamb-Dicke参数,温度和激光场的初相位等参数对这种量子态的非经典效应的影响.结果表明:非线性增光子热态的Mandel Q因子随温度的变化存在一个极小值.Lamb-Dicke参数越大,非线性增光子热态的非经典效应就越强.此外驻波场的初相位也对该态的非经典效应有明显的影响.

Nonclassical properties of nonlinear photon-added thermal state

According to the nonlinear Jaynes-Cummings model which describes the interaction of a trapped ion with a standing wave laser field, a new quantum state, so called nonlinear photon-added thermal state, is introduced. The effect of Lamb-Dicke parameter , temperature and phase of the standing field on the nonclassical effect of the quantum state is studied by using the method of theoretical analysis and numerical calculation. The results show that the change of Mandel factor of nonlinear photon-added thermal state with temperature has a minimum. The larger the Lamb-Dicke parameter is, the stronger nonclassical effects of the nonlinear photon added thermal state is. In addition, the initial phase of the standing wave field has a significant effect on the nonclassical effects of the state.