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.
arXiv comment8 pages, 4 figures
References in corpus (34)
- Quantum entanglement
- Quantum Cryptography
- Separability Criterion for Density Matrices
- A computable measure of entanglement
- Quantum information with continuous variables
- Separability of Mixed States: Necessary and Sufficient Conditions
- Peres-Horodecki separability criterion for continuous variable systems
- Inseparability criterion for continuous variable systems
- Multi-photon entanglement and interferometry
- Entangling macroscopic oscillators exploiting radiation pressure
- Squeezing as an irreducible resource
- Analysis and interpretation of high transverse entanglement in optical parametric down conversion
- Inseparability criteria for bipartite quantum states
- Schroedinger Cat: Entanglement test in a Micro-Macroscopic system
- Packet narrowing and quantum entanglement in photoionization and photodissociation
- Quantitative measures of entanglement in pair coherent states
- Theory of an Entanglement Laser
- Anisotropically high entanglement of biphotons generated in spontaneous parametric down conversion
- Quantum experiments with human eyes as detectors based on cloning via stimulated emission
- Spontaneous emission of a photon: wave packet structures and atom-photon entanglement
- Inseparability criteria based on matrices of moments
- Coarse Graining Makes It Hard to See Micro-Macro Entanglement
- Multi-photon, multi-mode polarization entanglement in parametric down-conversion
- Characterization of Spectral Entanglement of Spontaneous Parametric-Down Conversion Biphotons
- Comment on ``Inseparability Criteria for Continuous Bipartite Quantum States''
- Separability of Two-Party Gaussian States
- Macroscopic Pure State of Light Free of Polarization Noise
- Violation of multi-particle Bell inequalities for low and high flux parametric amplification using both vacuum and entangled input states
- Experimental amplification of an entangled photon: what if the detection loophole is ignored?
- Quantum to classical transition via fuzzy measurements on high gain spontaneous parametric down-conversion
- Local Realism of Macroscopic Correlations
- Entanglement criteria for microscopic-macroscopic systems
- Interference contrast in multi-source few photon optics
- Bell Inequality Tests with Macroscopic Entangled States of Light
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- Polarization-Entangled Light Pulses of 10^5 Photons
- Generating mesoscopic Bell states via collisions of distinguishable quantum bright solitons
- Bell Inequalities for Quantum Optical Fields
- Quantum steering inequality with tolerance for measurement-setting-errors: experimentally feasible signature of unbounded violation
- Spatial, spectral and temporal coherence of ultra-intense twin beams
- Orbital angular momentum modes of high-gain parametric down-conversion
- Filtering of the absolute value of photon-number difference for two-mode macroscopic quantum superpositions
- Coherent light in intense spatio-spectral twin beams
- Interference of macroscopic beams on a beam splitter: phase uncertainty converted into photon-number uncertainty
- Operational Gaussian Schmidt-Number Witnesses
- Multi-photon nonclassical correlations in entangled squeezed vacuum states
- Towards loophole-free Bell inequality test with preselected unsymmetrical singlet states of light
- Entangling two distinguishable quantum bright solitons via collisions
- Multi-photon quantum interference with high visibility using multiport beam splitters
- Estimation of covariance matrix of macroscopic quantum states
- Managing spectral properties and Schmidt mode content of squeezed vacuum light using sum-frequency converter
- Entanglement indicators for quantum optical fields: three-mode multiport beamsplitters EPR interference experiments
- Waves in intensity coherence of evolving intense twin beams
- Loss-tolerant hybrid measurement test of CHSH inequality with weakly amplified N00N states