Entanglement Witnesses and Measures for Bright Squeezed Vacuum
arXiv:1205.1979 · doi:10.1103/PhysRevA.86.022323
Abstract
Quantum entanglement is a fascinating phenomenon, especially if it is observed at the macroscopic scale. Importantly, macroscopic quantum correlations can be revealed only by accurate measurement outcomes and strategies. Here, we formulate feasible entanglement witnesses for bright squeezed vacuum in the form of the macroscopically populated polarization triplet Bell states. Their testing involves efficient photodetection and the measurement of the Stokes operators variances. We also calculate the measures of entanglement for these states such as the Schmidt number and the logarithmic negativity. Our results show that the bright squeezed vacuum degree of polarization entanglement scales as the mean photon number squared. We analyze the applicability of an operational analog of the Schmidt number.
8 pages, 4 figures
References in corpus (8)
- Schroedinger Cat: Entanglement test in a Micro-Macroscopic system
- Anisotropically high entanglement of biphotons generated in spontaneous parametric down conversion
- Quantum experiments with human eyes as detectors based on cloning via stimulated emission
- Inseparability criteria based on matrices of moments
- Characterization of Spectral Entanglement of Spontaneous Parametric-Down Conversion Biphotons
- Comment on ``Inseparability Criteria for Continuous Bipartite Quantum States''
- Quantum to classical transition via fuzzy measurements on high gain spontaneous parametric down-conversion
- Entanglement criteria for microscopic-macroscopic systems