共查询到10条相似文献,搜索用时 61 毫秒
1.
Heng-Mei Li Hong-Chun Yuan Zhi-Long Wan Zhen Wang 《International Journal of Theoretical Physics》2018,57(4):941-950
We theoretically introduce a kind of non-Gaussian entangled resources, i.e., coherent photon-added two-mode squeezed thermal states (CPA-TMSTS), by successively performing coherent photon addition operation to the two-mode squeezed thermal states. The normalization factor related to bivariate Hermite polynomials is obtained. Based upon it, the nonclassicality and decoherence process are analyzed by virtue of the Wigner function. It is shown that the coherent photon addition operation is an effective way in generating partial negative values of Wigner function, which clearly manifests the nonclassicality and non-Gaussianity of the target states. Additionally, the fidelity in teleporting coherent states using CPA-TMSTS as entangled resource is quantified both analytically and numerically. It is found that the CPA-TMSTS is an entangled resource of high-efficiency and high-fidelity in quantum teleportation. 相似文献
2.
Li-juan Xu 《Optics Communications》2011,284(13):3335-3344
We investigate the nonclassicality of two-mode photon-added squeezed vacuum state (TPASV) and its decoherence in a thermal environment according to the sub-Poissonian statistics and the negative region of Wigner function (WF). Based on the fact that the TPASV can be seen as a squeezed Hermite polynomial excitation state, we further obtain a compact expression for the normalization factor of TPASV, i.e., a Jacobi polynomial of the squeezing parameter. We also derive the explicit expression of WF of TPASV and then the decoherence effect on this state is also discussed by deriving the time evolution of the WF and its negative region. 相似文献
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4.
Nonclassicality and decoherence of coherent superposition operation of photon subtraction and photon addition on squeezed state 下载免费PDF全文
The statistical properties of m-coherent superposition operation (μa+νa+)m on the single-mode squeezed vacuum state (M-SSVS) and its decoherence in a thermal environment have been studied. Converting the M-SSVS to a squeezed Hermite polynomial excitation state, we obtain a compact expression for the normalization factor of M-SSVS, which is the Legendre polynomial of the squeezing parameter. We also derive the explicit expression of Wigner function (WF) of M-SSVS, and find the negative region of WF in phase space. The decoherence effect on this state is then discussed by deriving the time evolution of the WF. Using the negativity of WF, the loss of nonclassicality has been discussed. 相似文献
5.
The symbolic method (including normal ordering. antinormal ordering and Weyl ordering symbol) is usually utilized to tackle
miscellaneous operators which have different commutative relations. Considering the Weyl ordering symbol’s remarkable properties,
we have efficiently and conveniently derived the Wigner distribution function for field damping in a squeezed bath and a vacuum
bath respectively, and then examined the decoherence processes from the plots of Wigner function and its contour in quantum
phase space. Alternatively, we can employ a general Wigner operator under phase space transform to calculate distribution
function and discuss the damping process. 相似文献
6.
Hao-Liang Zhang Yin-Quan Hu Fang Jia Li-Yun Hu 《International Journal of Theoretical Physics》2014,53(6):2091-2107
Using a non-Gaussian operation—photon subtraction from two-mode squeezed thermal state (PS-TMSTS), we construct a kind of entangled state. A Jacobi polynomial is found to be related to the normalization factor. The negativity of Wigner function (WF) is used to discuss its nonclassicality. The investigated entanglement properties turn out that the symmetrical PS-TMSTS may be more effective than the non-symmetric for quantum teleportation. Then the time evolution of WF is used to examine the decoherence effect, which indicates that the characteristic time of single PS-TMSTS depends not only on the average photon number of environment, but also on the average photon number of thermal state and the squeezing parameter. 相似文献
7.
By using the technique of integration within an ordered product of operators,the normal ordered density operator of the photon-subtracted squeezed thermal state (PSSTS) is derived.Then the corresponding Wigner function is presented by using the coherent state representation of the Wigner operator.The nonclassical properties of the PSSTS are discussed based on the negativity of the Wigner function. 相似文献
8.
This paper investigates the decoherence of photo-subtracted squeezed vacuum state (PSSVS) in dissipative channel by describing its statistical properties with time evolution such as Wigner function,Husimi function,and tomogram.It first calculates the normalization factor of PSSVS related to Legendre polynomial.After deriving the normally ordered density operator of PSSVS in dissipative channel,one obtains the explicit analytical expressions of time evolution of PSSVS’s statistical distribution function.It finds that these statistical distributions loss their non-Gaussian nature and become Gaussian at last in the dissipative environment as expected. 相似文献
9.
Thermal Wigner Operator in Coherent Thermal State Representation and Its Application 总被引:1,自引:0,他引:1
FANHong-Yi 《理论物理通讯》2002,37(3):289-292
In the coherent thermal state representation we introduce thermal Wigner operator and find that it is “squeezed” under the thermal transformation.The thermal Wigner operator provides us with a new direct and neat approach for deriving Wigner functions of thermal states. 相似文献