Statistical properties of photon-subtracted two-mode squeezed vacuum and its decoherence in thermal environment

Hu, Li-Yun; Xu, Xue-Xiang; Fan, Heng

doi:10.1364/josab.27.000286

Cited by 56 publications

(35 citation statements)

References 53 publications

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“…This indicates that, different from the case of single-photon-subtracted STS where the negativity is present only for n c < sinh 2 λ [34], the WF of SPASTS always has the negative values at the phase space center α 0 ( γ 0). (This is similar to the case of the single-photon-added or single-photon-subtracted squeezed vacuum [30,40].) Using Eqs.…”

Section: Wigner Function Of Pastsmentioning

confidence: 61%

Nonclassicality and decoherence of photon-added squeezed thermal state in thermal environment

Zhang

2012

J. Opt. Soc. Am. B

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Theoretical analysis is given of nonclassicality and decoherence of the field states generated by adding any number of photons to the squeezed thermal state (STS). Based on the fact that the squeezed number state can be considered as a single-variable Hermite polynomial excited state, the compact expression of the normalization factor is derived, a Legendre polynomial. The nonclassicality is investigated by exploring the sub-Poissonian and negative Wigner function (WF). The results show that the WF of single-photon-added STS (PASTS) always has negative values at the phase space center. The decoherence effect on PASTS is examined by the analytical expression of WF. It is found that a longer threshold value of decay time than in single-photon-subtraction STS is included in single PASTS.

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Section: Wigner Function Of Pastsmentioning

confidence: 61%

Nonclassicality and decoherence of photon-added squeezed thermal state in thermal environment

Zhang

2012

J. Opt. Soc. Am. B

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“…By virtue of thermo field dynamics (TFD) theory [7,8], we construct the thermal entangled state representation (TESR) [9][10][11][12] in the doubled Fock space, i.e.,…”

Section: Entangled State Representation and Characteristic Functionmentioning

confidence: 99%

Kraus Operator-Sum Representation and Time Evolution of Distribution Functions in Phase-Sensitive Reservoirs

Wang

2011

Int J Theor Phys

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Using the thermal entangled state representation η|, we examine the master equation (ME) describing phase-sensitive reservoirs. We present the analytical expression of solution to the ME, i.e., the Kraus operator-sum representation of density operator ρ is given, and its normalization is also proved by using the IWOP technique. Further, by converting the characteristic function χ(λ) into an overlap between two "pure states" in enlarged Fock space, i.e., χ(λ) = η =−λ |ρ|η =0 , we consider time evolution of distribution functions, such as Wigner, Q-and P-function. As applications, the photon-count distribution and the evolution of Wigner function of photon-added coherent state are examined in phase-sensitive reservoirs. It is shown that the Wigner function has a negative value when κt 1 2 ln(1 + μ ∞ ) is satisfied, where μ ∞ depends on the squeezing parameter |M| 2 of environment, and increases as the increase of |M|.

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“…In order to increase quantum entanglement, two-mode photon-subtraction squeezed vacuum states (TPSSV) have received more attention from both experimentalists and theoreticians [5,10,[13][14][15][16][17][18][19][20][21][22]. Olivares et al [13] considered the photon subtraction using on-off photo detectors and showed improvement of quantum teleportation, depending on the various parameters involved.…”

Section: Introductionmentioning

confidence: 99%

Entanglement and nonclassicality of photon-added two-mode squeezed thermal state

Jia

Zhang

2012

J. Opt. Soc. Am. B

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We introduce a kind of entangled state-photon-addition two-mode squeezed thermal state (TM-STS) by adding photons to each mode of the TMSTS. Using the P-representation of thermal state, the compact expression of the normalization factor is derived, a Jacobi polynomial. The nonclassicality is investigated by exploring especially the negativity of Wigner function. The entanglement is discussed by using Shchukin-Vogel criteria. It is shown that the photon-addtion to the TMSTS may be more effective for the entanglement enhancement than the photon-subtraction from the TMSTS. In addition, the quantum teleportation is also examined, which shows that symmetrical photon-added TMSTS may be more useful for quantum teleportation than the non-symmetric case. PACS number(s): 42.50.Dv, 03.65.Wj, 03.67.Mn

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Statistical properties of photon-subtracted two-mode squeezed vacuum and its decoherence in thermal environment

Cited by 56 publications

References 53 publications

Nonclassicality and decoherence of photon-added squeezed thermal state in thermal environment

Nonclassicality and decoherence of photon-added squeezed thermal state in thermal environment

Kraus Operator-Sum Representation and Time Evolution of Distribution Functions in Phase-Sensitive Reservoirs

Entanglement and nonclassicality of photon-added two-mode squeezed thermal state

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