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Generalized photon-added coherent state and its quantum statistical properties

Chinese Physics B 2010年第10期19卷 296-304页

作者：袁洪春徐学翔范洪义 Department of Physics Shanghai Jiao Tong University College of Physics and Communication Electronics Jiangxi Normal University

In this paper, we propose a class of the generalized photon-added coherent states （GPACSs） obtained by repeatedly operating the combination of Bosonie creation and annihilation operatoes on the coherent state. The normalization factor of GPACS is related to Hermite polynomial. We also derive the explicit expressions of its statistical properties such as photocount distribution, Wigner function and tomogram and investigate their behaviour as the photon-added number varies graphically. It is found that GPACS is a kind of nonclassical state since Wigner function exhibits the negativity by increasing the photon-added number.

关键词： generalized photon-added coherent state photocount distribution Wigner function tomogram

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Nonclassicality of photon-modulated spin coherent states in the Holstein-Primakoff realization

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Chinese Physics B 2022年第5期31卷 334-339页

作者： Xiaoyan Zhang Jisuo Wang Lei Wang Xiangguo Meng Baolong Liang Shandong Provincial Key Laboratory of Laser Polarization and Information Technology School of Physics and Physical EngineeringQufu Normal UniversityQufu 273165China Shandong Provincial Key Laboratory of Optical Communication Science and Technology School of Physical Science and Information EngineeringLiaocheng UniversityLiaocheng 252059China School of Physics and Electronic Engineering Heze UniversityHeze 274015China

Two new photon-modulated spin coherent states(SCSs)are introduced by operating the spin ladder operators J±on the ordinary SCS in the Holstein-Primakoff realization and the nonclassicality is exhibited via their photon number distribution,second-order correlation function,photocount distribution and negativity of Wigner *** results show that the photocount distribution is a Bernoulli distribution and the Wigner functions are only associated with two-variable Hermite *** with the ordinary SCS,the photon-modulated SCSs exhibit more stronger nonclassicality in certain regions of the photon modulated number k and spin number j,which means that the nonclassicality can be enhanced by selecting suitable parameters.

关键词： the photon-modulated spin coherent state nonclassicality photocount distribution Wigner distribution function

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