Kerr介质中双光子T-C模型光场的量子特性

Quantum properties of light in the two-photon T-C model in Kerr medium

研究了存在Kerr介质时 ,耦合双原子与单模压缩真空场双光子跃迁相互作用系统光场的量子特性 ,讨论了Kerr介质和原子间偶极_偶极相互作用对光场量子特性的影响 .结果表明 :当Kerr效应和偶极_偶极相互作用可以忽略时 ,光场U2 分量的涨落能被周期性地压缩 ,随着Kerr效应和偶极_偶极相互作用的增强 ,光场的压缩逐渐变浅 ,压缩次数减少 ;Kerr效应和偶极_偶极相互作用的影响使光场的二阶相干度时间演化曲线呈现周期性的崩塌_回复现象 ,但不论耦合强度如何 ,光子总是呈现聚束效应 .

In this paper, the quantum properties of light in a system of two coupling atoms interacting with a single-model squeezed vacuum field at the two-photon transition in Kerr medium are studied by means of quantum theory.The influences of the Kerr medium and the dipole-dipole interaction between atoms are discussed. The results show that when the Kerr effect and the dipole-dipole interaction between atoms may be neglected, the fluctuation of U 2 can be squeezed periodically. With increasing the Kerr effect and the dipole-dipole interaction between atoms, the squeezing effect of light gradually becomes weak and the squeezing time of light gradually decreases. The periodical collapse-revival phenomenon of the time evolution of the second-order coherence degree of the field appears, which is caused by the influence of the Kerr effect and the dipole-dipole interaction between atoms. No matter how large are the coupling constants, the photon bunching always appears.