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arXiv quant-ph/9611003quant-ph
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一般形变振子、等谱振子系统与厄米相位算子

Generally Deformed Oscillator, Isospectral Oscillator System and Hermitian Phase Operator

Hong-Chen Fu, Ryu Sasaki

摘要:

研究了广义形变振子(GDO)及其多光子实现以及相干态和压缩真空态。我们讨论,特别是,GDO依赖于一个复杂的参数q(因此,我们称之为q-GDO)连同有限维循环表示。研究了等谱振子系统作为GDO的一个实际物理系统,发现它的相干态和压缩真空态与振子的相干态和压缩真空态密切相关。指出从q为单位根的q-GDO出发,可以用代数方法一致地定义量子光学中的厄米相位算符。利用循环表象定义了Pegg-Barnett型相位算子理论的新的产生算符和湮灭算符,并在经典极限q->1下退化为普通振子的产生算符和湮灭算符.

英文摘要:

The generally deformed oscillator (GDO) and its multiphoton realization as well as the coherent and squeezed vacuum states are studied. We discuss, in particular, the GDO depending on a complex parameter q (therefore we call it q-GDO) together with the finite dimensional cyclic representations. As a realistic physical system of GDO the isospectral oscillator system is studied and it is found that its coherent and squeezed vacuum states are closely related to those of the oscillator. It is pointed out that starting from the q-GDO with q root of unity one can define the hermitian phase operators in quantum optics consistently and algebraically. The new creation and annihilation operators of the Pegg-Barnett type phase operator theory are defined by using the cyclic representations and these operators degenerate to those of the ordinary oscillator in the classical limit q->1.

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