Multi-photon nonclassical correlations in entangled squeezed vacuum states

Abstract

Photon-number correlation measurements are performed on bright squeezed vacuum states using a standard Bell-test setup, and quantum correlations are observed for conjugate polarization-frequency modes. We further test the entanglement witnesses for these states and demonstrate the violation of the separability criteria, which infers that all the macroscopic Bell states, containing typically $10^6$ photons per pulse, are polarization entangled. The study also reveals the symmetry of macroscopic Bell states with respect to local polarization transformations.

5 pages, 4 figures

References in corpus (6)

• Quantum entanglement of a large number of photons
• Schroedinger Cat: Entanglement test in a Micro-Macroscopic system
• Polarization-Entangled Light Pulses of 10^5 Photons
• Quantum to classical transition via fuzzy measurements on high gain spontaneous parametric down-conversion
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Cited by in corpus (4)

• Characterizations and Quantifications of Macroscopic Quantumness and Its Implementations using Optical Fields
• A classical model of spontaneous parametric down-conversion
• General mapping of multi-qu$d$it entanglement conditions to non-separability indicators for quantum optical fields
• Estimation of covariance matrix of macroscopic quantum states