Multiphoton Bell-type inequality: a tool to unearth nonlocality of continuous variable quantum optical systems

Abstract

We consider a multiphoton Bell-type inequality to study nonlocality in four-mode continuous variable systems, which goes beyond two-photon states and can be applied to mixed as well as states with fluctuating photon number. We apply the inequality to a wide variety of states such as pure and mixed Gaussian states (including squeezed thermal states) and non-Gaussian states. We consider beam splitters as a model for leakage and show that the inequality is able to detect nonclassicality of noisy Gaussian states as well. Finally, we investigate nonlocality in pair-coherent states and entangled coherent states, which are prominent examples of nonclassical, non-Gaussian states.

Revtex 11 pages 9 figures

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• Mesoscopic and macroscopic quantum correlations in photonic, atomic and optomechanical systems
• Non-Gaussian two mode squeezed thermal states in continuous variable quantum teleportation
• Re-examination of the role of displacement and photon catalysis operation in continuous variable measurement device-independent quantum key distribution
• Noisy dynamics of Gaussian entanglement: a transient bound entangled phase before separability