Fidelity of quantum states in the multiphoton Jaynes-Cummings model with a time-varying frequency field

卢道明 Lu Daoming

Qiu, Changdong

Xiaoping Yang, Xiping Zheng

Lu Dao

Using the multiphoton Jaynes-Cummings model,the dynamical properties of the fidelity of quantum states in the system that consists of a two-level atom interacting with a single-mode field via multiphoton transition are studied.The frequency of the field varying with time in the form of sine is considered.The results obtained by numerical calculations show that the time-evolution behavior of the fidelities of field and system is not influenced by the frequency variation of field,but the time-evolution behavior of the fidelity of atom is modulated by the frequency variation of field.The larger the amplitude of the field frequency variance u is,the stronger modulation interaction of the field frequency variance is.When the amplitude u is larger than a fixed value,the time-evolution behavior of the fidelity of atom will display quasiperiodic oscillation behavior.Its oscillation period is in agreement with the period of frequency varying.The initial state of atom influences the time-evolution behavior of the fidelity of atom.

Xiao-Jing Liu, Jing-Bin Lu, Si-Qi Zhang +9 more

Jiang Xun

The atomic dynamical properties in the multiphoton Jaynes-Cummings model are studied by the numerical method.The frequency of the field varying with time in the sinusoidal forms has been considered.Te atomic dynamical properties are influenced by the frequency parameters and the field varying with time.