Chinese journal of atomic and molecular physics

The fidelities of quantum states of system in Jaynes-Cummings model containing atomic motion

Liu Tang

Published Jan 1, 2001• 1 citation

Abstract

The fidelities of quantum states of system in Jaynes Cummings model containing atomic motion under action of coherent field are studied. The influence of atomic motion and the field mode structure on the fidelities of quantum states of system in different atomic initial states is discussed. The result indicates that both the atomic motion and the field mode structure can modulate the fidelities of quantum states in the system of interaction.

Related papers

Fidelities of quantum states in intensity-dependent Jaynes-Cummings model

Rao Jintong, Wang Jiasi, Liang Jun

Based on the quantum theory and numerical calculation,the fidelities of quantum states were investigated in intensity-dependent Jaynes-Cummings model containing atomic motion under the interaction of coherent field.The analytical expressions of the fidelities of quantum states were derived and simulation results were obtained.In addition,the influence of atomic motion and the field mode structure on the fidelities of quantum states of the system in different atomic initial states was discussed.The results indicate that both the atomic motion and the field mode structure can modulate the fidelities of quantum states in the system of interaction.The greater the velocities of atomic motion,the higher the fidelities of the three systems are.On the other hand,the larger the field mode structures,the higher fidelity of the three systems.The results are meaningful for the development of quantum communication and quantum calculation.

Laser TechnologyJan 1, 20120 citations

Fidelity of Quantum States in the Jaynes-Cummings Model with a Time-varying Frequency Field

Lu Dao

Using the 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 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 are 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 periodic oscillation behavior.Its oscillation period is in agreement with the period of frequency varying.

ACTA PHOTONICA SINICAJan 1, 20100 citations

Influence of the cavity dissipation on fidelity of quantum state in the large detune J-C model

Hai Wang

The fidelities of quantum states of system in Jaynes-Cummings model considering the dissipation of cavity were studied by using the complete quantum theory.The influences of the cavity damping constant and the numerical value of initial mean photon number on the fidelities of quantum states was discussed.It was found that both of them affect the fidelities of atom and of atom-cavity system obviously.

Journal of Atomic and Molecular PhysicsJan 1, 20090 citations

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

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.

Optical TechniqueJan 1, 20100 citations

Nonclassical feature of the field in the two-atom Tavis-Cummings model with atomic motion

Wang Zhong-Chun, 盐城师范学院物理系,盐城 224002

We study the nonclassical feature of the field in the two-atom Tavis-Cummings model with atomic motion using the quantum theory. The influence of atomic motion, the field mode structure and the field initial states on the properties of the light squeezing and the photon antibunching are discussed.

Acta Physica SinicaJan 1, 20064 citations

The dynamical properties in the nonlinear Jaynes-Cummings model

YX Huang, Y Wang, Zhan Zhan

The properties of state evolution of the atom, field, and atom-field systems in the intensity-dependent coupling Jaynes-Cummings Model with an additional Kerr medium are investigated by using the distance between density operators. The effects of nonlinearity interaction of Kerr medium and the average photon number of initial coherent field on the dynamical behaviour of the quantum system are discussed in comparison with the one-photon Jaynes-Cummings model with an additional Kerr medium.

Oct 1, 20020 citations