Enhanced multipartite quantum correlations by non-Gaussian operations
arXiv:1309.2028 · doi:10.1103/PhysRevA.88.032109
Abstract
We study how conditional photon operations can affect multipartite quantum correlations, specifically nonlocality and entanglement, of the continuous variable 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.
11 pages, 10 figures, to appear in Phys. Rev. A
References in corpus (12)
- Universal Quantum Computation with Continuous-Variable Cluster States
- Entanglement in continuous variable systems: Recent advances and current perspectives
- Bell inequality violation with two remote atomic qubits
- Continuous variable tangle, monogamy inequality, and entanglement sharing in Gaussian states of continuous variable systems
- Continuous variable quantum teleportation with non-Gaussian resources
- Recent developments in photon-level operations on travelling light fields
- All bipartite entangled states display some hidden nonlocality
- Bell inequalities for continuous-variable correlations
- Necessary and sufficient detection efficiency for the Mermin inequalities
- Testing Bell inequalities with photon-subtracted Gaussian states
- Entanglement distillation for continuous-variables under a thermal environment: Effectiveness of a non-Gaussian operation
- Loophole-free Bell test for continuous variables via wave and particle correlations
Cited by in corpus (9)
- Tomography of a Mode-Tunable Coherent Single-Photon Subtractor
- Testing nonclassicality and non-Gaussianity in phase space
- Quantifying non-Gaussianity of quantum-state correlation
- Demonstrating nonclassicality and non-Gaussianity of single-mode fields: Bell-type tests using generalized phase-space distributions
- Hierarchies of multipartite entanglement for continuous-variable states
- Faithful measure of Quantum non-Gaussianity via quantum relative entropy
- Multiphoton Bell-type inequality: a tool to unearth nonlocality of continuous variable quantum optical systems
- Monogamy relation in multipartite continuous-variable quantum teleportation
- Significance of Fidelity Deviation in Continuous Variable Teleportation