Quantum-phase and information-entropy dynamics of a two-state molecular system interacting with strongly amplitude- and phase-squeezed fields
Quantum-phase and information-entropy dynamics of a two-state molecular system interacting with strongly amplitude- and phase-squeezed fields
复制标题
与强振幅和相位压缩场相互作用的二态分子系统的量子相和信息熵动力学
DOI：
10.1063/1.480851
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发表时间：
2000
影响因子：
4.4
通讯作者：
K. Yamaguchi
中科院分区：
文献类型：
--
作者：
M. Nakano;K. Yamaguchi
我们对一个两态分子模型系统与初始单模强振幅和强相位压缩场（平均光子数n =8）相互作用的量子动力学进行了精确的数值计算。取这些光场的二阶关联函数为2，与平均光子数相同的混沌光场的二阶关联函数等价。虽然分子对这两种压缩场的响应与混沌场的响应比较相似，但发现这两种场在光子的量子相位分布的动力学行为上有一些显著的差异，即，Pegg-Barnett相位和Q函数分布。这些差异也通过分子的信息熵的动力学来阐明，即，分子熵，表示分子与光子场之间的纠缠程度。
We perform numerically exact calculations of quantum dynamics for a two-state molecular model system interacting with initially single-mode strongly amplitude- and strongly phase-squeezed fields (average photon number 〈n〉=8). The second-order correlation function for these fields are taken to be 2, which is equivalent to that for the chaotic field with the identical average photon number. Although the responses of the molecule for these two squeezed fields are relatively similar to those for the chaotic field as shown in a previous paper, there are found to be some significant differences among these fields in the dynamical behavior of quantum-phase distributions of photons, i.e., the Pegg–Barnett phase and the Q function distributions. These differences are also elucidated by the dynamics of the information entropy for the molecule, i.e., molecular entropy, which represents the degree of entanglement between the molecule and the photon field.