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arXiv:2209.02561 · International Journal of Theoretical Physics

A Class of Non-Classicality and Non-Gaussianity of Photon Added Three-mode GHZ-type Entangled Coherent States

L. Jebli, Rachid Houça, Mohammed Daoud A

Published Sep 16, 2022• 2 citations
arXivHTMLPDF
DOI
10.1007/s10773-022-05221-8

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We compare the lower and higher order non-classicality of a class of the photon-added Bell-type entangled coherent states (PBECS) got from Bell-type entangled coherent states using creation operators. We obtained lower and higher order criteria namely Mandel's QmlQ_m^lQml​, antibunching dhl−1d_h^{l-1}dhl−1​, Subpoissioning photon statistics Dh(l−1)D_h(l-1)Dh​(l−1) and Squeezing S(l)S(l)S(l) for the states obtained. Further we observe that first three criteria does not gives non-classicality for any state and higher order criteria gives very high positive values for all values of parameters. Also the fourth or last criterion S(l)S(l)S(l) gives non-classicality for lower order as well as higher order.
We investigate non-Gaussianity properties for a set of classical one-mode states obtained by subtracting photons from a thermal state. Three distance-type degrees of non-Gaussianity used for these states are shown to have a monotonic behaviour with respect to their mean photon number. Decaying of their non-Gaussianity under damping is found to be consistently described by the distance-type measures considered here. We also compare the dissipative evolution of non-Gaussianity when starting from MMM-photon-subtracted and MMM-photon-added thermal states
Abstract We introduce a new state called photon-added-and-subtracted two modes pair coherent state (PAASTMPCS) by simultaneously adding and subtracting photons to the different modes of a pair coherent state. Its nonclassical and non-Gaussian properties are strengthened via the negative values of its Wigner function as the numbers of adding and subtracting photons are increased. It indicates that the PAASTMPCS is an entangled state. When increasing the numbers of photon-added and photon-subtracted to a pair coherent state, the degree of entanglement in the PAASTMPCS is enhanced compared with the original pair coherent state. By using a PAASTMPCS as a non-Gaussian entangled resource, the quantum teleportation processes are studied in detail. It is shown that the number sum and phase difference measurements protocol is more appropriate than the orthogonal quadrature components measurements protocol in the quantum teleportation process of a coherent state.