Enhanced multipartite quantum correlation by non-Gaussian operations

Ho Joon Kim, Jaewan Kim, Hyunchul Nha

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12 Citations (Scopus)

Abstract

We study how conditional photon operations can affect multipartite quantum correlations, specifically nonlocality and entanglement, of the continuous-variable Greenberger-Horne-Zeilinger (GHZ) states. We find that the violation of the Mermin-Klyshko inequality revealing the multipartite nonlocality can be made stronger with photon subtraction applied on each mode of the original GHZ states, particularly in a weak squeezing regime. Photon addition applied on local modes also turns out to enhance the degree of multipartite nonlocality in a broad range of parameters. We further investigate the effects of the photon operations on the degree of multipartite entanglement by looking into the Gaussian tangle, the fidelity of teleportation network, and the quadrature correlations. We find that photon subtraction applied on two modes enhances those entanglement characteristics in a practical squeezing regime while there is no improvement made by photon addition.

Original languageEnglish
Article number032109
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume88
Issue number3
DOIs
Publication statusPublished - 16 Sep 2013

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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