Nonclassicality and teleportation fidelity of coherent photon-subtracted two-mode squeezed thermal states

Abstract

The coherent photon-subtracted two-mode squeezed thermal states (CPS-TMSTS) are theoretically introduced by successively performing coherent photon subtraction operation on the two-mode squeezed thermal states (TMSTS). Based upon the normalization factor which is related to bivariate Hermite polynomials, the nonclassicality and non-Gaussianity are analyzed according to the Wigner function. It is shown that the coherent photon subtraction operation is an effective manner in generating nonclassicality and non-Gaussianity. Furthermore, the fidelity in teleporting coherent states using CPS-TMSTS as entangled resources is quantified both analytically and numerically. It is shown that the quantities of fidelity are clearly larger than that in the original TMSTS, and it can be further improved by modulating control parameters effectively. The CPS-TMSTS, as the ideal entangled resources with higher quantum teleportation fidelity, shall have potential applications in quantum optics tasks.

Enhancing quantum features and teleportation fidelity of two-mode non-Gaussian states using conditional measurements

“…where |ψ, q, k, l⟩ ab is given in equation (14). After Alice performs the joint measurement of the orthogonal quadrature components on modes a and c, the state of the system becomes to reduce…”

“…Specifically, entanglement states form the core of Advancing new entanglement states can be achieved by employing non-Gaussian operations on the original states, which possess limited quantum correlations. The enumeration of these operations includes photon addition [8][9][10][11], photon subtraction [12,13], coherent photon subtraction [14], the combination of photon subtraction and addition [15], the superposition of photon addition and/or subtraction [16,17], Hermite polynomial excited operation [18], as well as the utilization of other conditional measurements [19]. Through these engineering techniques, various quantum features such as entanglement degree, Einstein-Podolsky-Rosen (EPR) correlation, squeezing, EPR steering, the negativity of the Wigner function, and others are augmented in comparison to the characteristics of the initial states.…”