SQUEEZED STATES WITH THERMAL NOISE .2. DAMPING AND PHOTON-COUNTING

被引:71
作者
MARIAN, P [1 ]
MARIAN, TA [1 ]
机构
[1] UNIV BUCHAREST, DEPT PHYS, R-76900 BUCHAREST, ROMANIA
来源
PHYSICAL REVIEW A | 1993年 / 47卷 / 05期
关键词
D O I
10.1103/PhysRevA.47.4487
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We consider a single-mode radiation field initially in a displaced squeezed thermal state. The weak interaction of such a field with a heat bath of arbitrary temperature is shown to preserve the Gaussian form of the characteristic function. Accordingly, the study of the time development of the density operator reduces to our previous description [P. Marian and T. A. Marian, preceding paper, Phys. Rev. A 47, 4474 (1993)] of the initial quantum state. As examples, photon statistics and squeezing properties of the damped field are analyzed. Based on the close relation between field dissipation and photon detection, we derive simple analytic formulas for the counting distribution and its factorial moments. Non-classical features of a displaced squeezed thermal state, such as oscillations of the photon-number distribution, survive in the counting process, provided that the quantum efficiency of the detector is high enough.
引用
收藏
页码:4487 / 4495
页数:9
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