在非线性J—C模型系统中制备“薛定谔猫态”

证明在含有克尔介质的双光子Ｊ－Ｃ模型系统中通过对原子的测量可以制备“薛定谔猫态”。选择适当的测量时间，原子初态及非线性系数，即可产生偶相干态，奇相干态和Ｙ－Ｓ相干态。     

THE DISENTANGLED-STATE IN THE TWO-PHOTON JAYNES-CUMMING MODEL WITH A KERR-LIKE MEDIUM

The pure state dynamical evolution of the atomic as well as the field states in the two-photon Jaynes Cumming model with a Kerr-like medium for the field initially in the coherent state is investigated under the high-field approximation (\bar{n}＞＞1). Analytic expressions of the disentanglement conditions and the relevant disentangled states are derived, which are closely related to Kerr nonlinear coupling constant. This study also reveals that the initial atomic excited state can be evolved into the atomic dipole squeezed state.     

PREPARATION OF NONCLASSICAL STATES OF A CAVITY FIELD BASED ON A NONLINEAR JAYNES-CUMMINGS MODEL

It is proven in this paper that some kinds of nonclassical quantum states of the cavity field, such as Schr?dinger cat state (amplitude cat or phase cat), sub-Poissonian photon distribution and Fock state, etc., can be generated by conditional meas urements on atoms in the two-photon Jaynes-Cummings model with a Kerr-like medium. The nonlinear constant plays the key modulation role in the preparation of the quantum states, which gives a new controllable parameter for further experi mental researches in this field.     

Generation of maximally entangled states in a two-component Bose-Einstein condensate

We study analytically the generation of maximally entangled states （MESs） formed by a two-component Bose-Einstein condensate （BEC） trapped in an adiabatically driven single potential well. Under the condition of the linear interaction controlled by a driven field being much stronger than the effective nonlinear interaction between the components, MESs, as some particular cases of superpositions of spin coherent states （SSCS）, may emerge periodically along with not only time evolution but also the equidifferent change of the linear coupling strength at a particular time.     

The quantum features of the photon statistics in a semiconductor microcavity

The quantum features of the temporal photon statistics of an exciton--cavity coupled system in a quantum-well semiconductor microcavity are investigated analytically. Under the secular approximation, if the nonlinear interactions, i.e. the exciton--exciton coupling and the phase-space filling, are much weaker than the exciton--photon interaction, the evolution of the Fano factor shows that the distribution of the photon numbers exhibits the feature of collapses--revivals (CRs), and the relevant revival time may be adjusted by several factors such as the total particle number, the detuning, and the nonlinear coupling strengths, etc. Especially, the ideal maximum antibunching with the minimum value 0 of the Fano factor occurs periodically for such a situation, with the dissipation of exciton--polariton being ignored.