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Nonclassicality of photon-modulated atomic coherent states in the Schwinger bosonic realization

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Chinese Physics B 2020年第12期29卷 307-312页

作者： jisuo wang Xiangguo Meng Xiaoyan Zhang Shandong Provincial Key Laboratory of Laser Polarization and Information Technology College of Physics and EngineeringQufu Normal UniversityQufu 273165China Shandong Provincial Key Laboratory of Optical Communication Science and Technology School of Physical Science and Information EngineeringLiaocheng UniversityLiaocheng 252059China

We theoretically introduce two new photon-modulated atomic coherent states(ACSs)via using the Schwinger bosonic representation of the angular momentum operators(the sequential operations J±n)on an ACS,and investigate their nonclassicality using the Wigner distribution,photon number distribution,and entanglement *** is found that photonmodulated ACSs possess more stronger nonclassicality than the original ACS in certain regions ofτ,the nonclassicality enhances with increasing number n of the operations J±and the operation J+(-)n enhances the entanglement in the region of small(large)τ.

关键词： photon-modulated atomic coherent state nonclassicality Wigner distribution entanglement

Generalized two-mode coherent-entangled state with real parameters

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Science China(Physics,Mechanics & Astronomy) 2009年第7期52卷 1027-1033页

作者： XU ShiMin XU XingLei LI HongQi wang jisuo Department of Physics Heze UniversityHeze 274015China Department of Physics Liaocheng UniversityLiaocheng 252059China

The coherent-entangled state |α, x; λ> with real parameters λ is proposed in the two-mode Fock space, which exhibits the properties of both the coherent and entangled states. The completeness relation of |α, x; λ> is proved by virtue of the technique of integral within an ordered product of operators. The corresponding squeezing operator is derived, with its own squeezing properties. Furthermore, generalized P-representation in the coherent-entangled state is constructed. Finally, it is revealed that superposition of the coherent-entangled states may produce the EPR entangled state.

关键词： bipartite coherent-entangled state IWOP technique classical transformation

The construction of the generalized continuously variable two-mode entangled state and its application

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Science China(Physics,Mechanics & Astronomy) 2009年第12期52卷 1932-1937页

作者： LI HongQi XU ShiMin XU XingLei wang jisuo Department of Physics Heze UniversityHeze 274015China Department of Physics Liaocheng UniversityLiaocheng 252059China

The generalized continuous variable two-mode entangled state |?> is proposed by using the technique of integration within an ordered product (IWOP) of operators. The characteristics of this new entangled representation and its application in quantum teleportation are analyzed in detail. These results indicate that such real parameters |?> indeed make up a new entangled representation owing to its completeness and orthogonal relation. By employing the |?> as quantum transmission channel, the teleportation of any single-mode quantum state 3 |ψ>3 can be realized by a unitary transformation.

关键词： IWOP technique generalized continuous variable entangled state Schmidt decompositions quantum teleportation

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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奇偶对相干态的维格纳函数和层析图函数

光学学报 2008年第3期28卷 549-555页

作者：孟祥国王继锁梁宝龙聊城大学物理系山东聊城252059

利用纠缠态η〉表象下的维格纳算符,重构了奇偶对相干态的维格纳函数。根据维格纳函数在相空间中随变量ρ和γ的变化规律,讨论了奇偶对相干态的非经典性质和量子干涉效应。研究发现,奇偶对相干态总呈现非经典性质,并且当q取奇数时,奇偶... 详细信息

利用纠缠态η〉表象下的维格纳算符,重构了奇偶对相干态的维格纳函数。根据维格纳函数在相空间中随变量ρ和γ的变化规律,讨论了奇偶对相干态的非经典性质和量子干涉效应。研究发现,奇偶对相干态总呈现非经典性质,并且当q取奇数时,奇偶对相干态更容易出现非经典性质。奇偶对相干态的量子干涉效应的显著程度与q取值有关,但对于q的同一取值,奇对相干态的量子干涉效应更为显著。利用纠缠态η〉表象下的维格纳算符Δ1,2(ρ,γ)和纠缠态η,1τ,2τ〉的投影算符之间满足的拉东变换,获得了奇偶对相干态的量子层析图函数。

关键词：量子光学奇偶对相干态纠缠态表象维格纳函数层析图函数

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增光子奇偶相干态的相位特性

光学学报 2007年第4期27卷 721-726页

作者：孟祥国王继锁梁宝龙聊城大学物理系聊城252059

借助于Pegg-Barnett相位算符理论和数值计算方法,研究了增光子奇偶相干态的相位概率分布,在此基础之上,讨论了有关数算符和相位算符的压缩特性。结果表明,增光子奇偶相干态的相位概率分布与通常的奇偶相干态、非线性相干态不同,在这种... 详细信息

借助于Pegg-Barnett相位算符理论和数值计算方法,研究了增光子奇偶相干态的相位概率分布,在此基础之上,讨论了有关数算符和相位算符的压缩特性。结果表明,增光子奇偶相干态的相位概率分布与通常的奇偶相干态、非线性相干态不同,在这种新的奇偶相干态中,其Pegg-Barnett相位概率分布能明显地反映出不同的量子相位信息和干涉特性。同时发现,在参量α的某些不同的取值范围内,增光子奇偶相干态在数算符和相位算符分量上均存在压缩效应。

关键词：量子光学增光子奇偶相干态 Pegg—Barnett相位算符相位概率分布压缩效应

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双模激发压缩真空态的维格纳函数

光学学报 2007年第9期27卷 1700-1705页

作者：孟祥国王继锁梁宝龙聊城大学物理系聊城252059

利用纠缠态表象下的维格纳(Wigner)算符,构造了双模激发压缩真空态的维格纳函数,并根据该函数在相空间ρ-γ中随参量m,n和r的变化关系,讨论了双模激发压缩真空态的量子干涉特性和压缩效应。结果表明,对于参量m,n不同的取值,双模激发压... 详细信息

利用纠缠态表象下的维格纳(Wigner)算符,构造了双模激发压缩真空态的维格纳函数,并根据该函数在相空间ρ-γ中随参量m,n和r的变化关系,讨论了双模激发压缩真空态的量子干涉特性和压缩效应。结果表明,对于参量m,n不同的取值,双模激发压缩真空态的量子干涉效应的强弱不同;而对于不同的压缩参量r,双模激发压缩真空态呈现出不同程度的压缩效应。最后,根据双模激发压缩真空态的维格纳函数的边缘分布,阐明了此维格纳函数的物理意义。

关键词：量子光学双模激发压缩真空态纠缠态表象维格纳函数边缘分布函数