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Entanglement Involved in Pair Coherent State Studied via Wigner Function Formalism
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作者 HU Li-Yun FAN Hong-Yi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第12期1071-1075,共5页
We calculate Wigner function, tomogram of the pair coherent state by using its Sehmidt decomposition in the coherent state representation. It turns out that the Wigner function can be seen as the quantum entanglement ... We calculate Wigner function, tomogram of the pair coherent state by using its Sehmidt decomposition in the coherent state representation. It turns out that the Wigner function can be seen as the quantum entanglement (QE) between two two-variable Hermite polynomials (TVHP) and the tomogram is further simplified as QE of two single-variable Hermite polynomials. The Husimi function of pair coherent state is also calculated. 展开更多
关键词 pair coherent state Wigner function TOMOGRAM Husimi function
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Study of Concurrence and D-Concurrence on Two-Qubits Resulted in Pair Coherent States in Language of SU(2) Coherent States
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作者 S.Salimi A.Mohammadzade 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第8期241-246,共6页
Pair coherent state, is a state of a two-mode radiation field that is known as a state with non-gaussian wave function. In this paper, study on the pair coherent state, we notice that with superposition of two first t... Pair coherent state, is a state of a two-mode radiation field that is known as a state with non-gaussian wave function. In this paper, study on the pair coherent state, we notice that with superposition of two first terms of this states, one two-qubits formed. Because of the importance of two-qubits in theory of quantum entanglement, with two different measures with the title of concurrence and D-concurrence, we have studied the amount of entanglement and discussed its details. At the end, we describe these measures for pair coherent states as a function of the amplitude of the SU(2) coherent states. 展开更多
关键词 ENTANGLEMENT pair coherent states CONCURRENCE
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Wigner function for the generalized excited pair coherent state
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作者 孟祥国 王继锁 +1 位作者 梁宝龙 李洪奇 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第5期1791-1797,共7页
This paper introduces the generalized excited pair coherent state (GEPCS). Using the entangled state 〈η〉 representation of Wigner operator, it obtains the Wigner function for the GEPCS. In the ρ-γ phase space, ... This paper introduces the generalized excited pair coherent state (GEPCS). Using the entangled state 〈η〉 representation of Wigner operator, it obtains the Wigner function for the GEPCS. In the ρ-γ phase space, the variations of the Wigner function distributions with the parameters q, α, k and l are discussed. The tomogram of the GEPCS is calculated with the help of the Radon transform between the Wigner operator and the projection operator of the entangled state |η1, η2, τ1, τ2|. The entangled states |η〉 and |η1, η2, τ1, τ2〉 provide two good representative space for studying the Wigner functions and tomograms of various two-mode correlated quantum states. 展开更多
关键词 generalized excited pair coherent state Wigner function TOMOGRAM entangled state representation
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Finite-dimensional even and odd nonlinear pair coherent states and their some nonclassical properties
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作者 孟祥国 王继锁 刘堂昆 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第9期3350-3357,共8页
In this paper a new class of finite-dimensional even and odd nonlinear pair coherent states (EONLPCSs), which can be realized via operating the superposed evolution operators D±(τ) on the state |q, 0), is ... In this paper a new class of finite-dimensional even and odd nonlinear pair coherent states (EONLPCSs), which can be realized via operating the superposed evolution operators D±(τ) on the state |q, 0), is constructed, then their orthonormalized property, completeness relations and some nonclassical properties are discussed. It is shown that the finite-dimensional EONLPCSs possess normalization and completeness relations. Moreover, the finite-dimensional EONLPCSs exhibit remarkably different sub-Poissonian distributions and phase probability distributions for different values of parameters q, η and ξ. 展开更多
关键词 finite-dimensional even and odd nonlinear pair coherent state sub-Poissonian distribution phase probability distribution
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Finite-dimensional pair coherent state engendered via the nonlinear Bose operator realization and its Wigner phase-space distributions
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作者 Jianming Liu Xiangguo Meng 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第12期180-185,共6页
We theoretically analyze the photon number distribution,entanglement entropy,and Wigner phase-space distribution,considering the finite-dimensional pair coherent state(FDPCS)generated in the nonlinear Bose operator re... We theoretically analyze the photon number distribution,entanglement entropy,and Wigner phase-space distribution,considering the finite-dimensional pair coherent state(FDPCS)generated in the nonlinear Bose operator realization.Our results show that the photon number distribution is governed by the two-mode photon number sum q of the FDPCS,the entanglement of the FDPCS always increases quickly at first and then decreases slowly for any q,and the nonclassicality of the FDPCS for odd q is more stronger than that for even q. 展开更多
关键词 finite-dimensional pair coherent state entangled state
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