Two-photon coherent states of the radiation field
Two-photon coherent states of the radiation field
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DOI：
10.1103/physreva.13.2226
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发表时间：
1976-06
影响因子：
2.9
通讯作者：
H. Yuen
中科院分区：
文献类型：
--
作者：
H. Yuen
介绍了双光子相干态的概念及其在量子光学中的应用。它是著名的最小不确定性波包的简单推广。研究了双光子相干态的详细性质，并将其与普通相干态区别开来。这些双光子相干态在数学上是通过与二次哈密顿量相关联的幺正算符从相干态生成的。在物理上，它们是远高于阈值工作的理想双光子激光器的辐射态。这些态的均方量子噪声行为与最小测不准态基本相同，导致了相干态或单光子激光器无法获得的应用。双光子相干态的基本行为不受系统中小损耗的影响。这些态在光计数实验中产生的计数率或分布也揭示了它们与相干态的区别。
The concept of a two-photon coherent state is introduced for applications in quantum optics. It is a simple generalization of the well-known minimum-uncertainty wave packets. The detailed properties of two-photon coherent states are developed and distinguished from ordinary coherent states. These two-photon coherent states are mathematically generated from coherent states through unitary operators associated with quadratic Hamiltonians. Physically they are the radiation states of ideal two-photon lasers operating far above threshold, according to the self-consistent-field approximation. The mean-square quantum noise behavior of these states, which is basically the same as those of minimum-uncertainty states, leads to applications not obtainable from coherent states or one-photon lasers. The essential behavior of two-photon coherent states is unchanged by small losses in the system. The counting rates or distributions these states generate in photocount experiments also reveal their difference from coherent states.