对相干态与原子作用后非经典性质的演化  

Nonclassical Properties of Fields in Pair Coherent States Interacting With Two Two-Level Atoms

作　　者：郑小兰[1] 陈子翃[1] 

机构地区：[1]福州大学物理与信息工程学院,福建福州350002

出　　处：《光学学报》2010年第10期3054-3058,共5页Acta Optica Sinica

基　　金：国家自然科学基金(10974028);福建省自然科学基金(2009J06002)资助课题

摘　　要：利用Jaynes-Cummings模型来讨论初始处于对相干态的腔场的两个模分别与两个二能级原子共振相互作用后非经典性质的演化,例如双模压缩性、亚泊松分布、模间二阶相干度和对柯西-沣施瓦茨不等式的违背和对贝尔不等式的违背等。通过数值模拟,发现原子在与腔场共振相互作用后,并选择性探测原子的内态,能使上述某些非经典效应得到明显增强。此外,在原子-沣腔相互作用后再对原子施加一个共振经典微波场,这个经典场将对原子态做幺正变换,适当选择变换的参数后再对原子进行选择性测量,则此时腔场的双模压缩性可得到一定增强。Under the Jaynes-Cummings model,the evolution of nonclassical properties of two cavity modes is discussed,such as squeezing,sub-Poissonian statistics and violations of Cauchy-Schwarz inequalities and Bell inequalities are discussed.The two cavity modes are initially in pair coherent states,each mode interacts with two two-level atoms resonantly.Numerical simulation results show that some nonclassical properties can be enhanced after resonant interaction between the atoms and the cavity and the performance of a selective atomic measurement.Moreover,after atom-cavity interaction,a resonant classical microwave field is applied to the atoms,which performs a unitary transformation on the atomic states,a selective measurement is performed to the atoms after selecting transform parameters the two-mode squeezing can be somehow enhanced.

关 键 词：量子光学 非经典性质 共振作用 对相干态 选择性探测 

分 类 号：O431.2[机械工程—光学工程]