Verifying continuous variable entanglement of intense light pulses
arXiv:quant-ph/0511202 · doi:10.1103/PhysRevA.73.012306
Abstract
Three different methods have been discussed to verify continuous variable entanglement of intense light beams. We demonstrate all three methods using the same set--up to facilitate the comparison. The non--linearity used to generate entanglement is the Kerr--effect in optical fibres. Due to the brightness of the entangled pulses, standard homodyne detection is not an appropriate tool for the verification. However, we show that by using large asymmetric interferometers on each beam individually, two non-commuting variables can be accessed and the presence of entanglement verified via joint measurements on the two beams. Alternatively, we witness entanglement by combining the two beams on a beam splitter that yields certain linear combinations of quadrature amplitudes which suffice to prove the presence of entanglement.
11 pages, 7 figures, to appear in Phys. Rev. A
References in corpus (19)
- Quantum information with continuous variables
- Peres-Horodecki separability criterion for continuous variable systems
- Inseparability criterion for continuous variable systems
- Entanglement by a beam splitter: nonclassicality as a prerequisite for entanglement
- Quantum Dense Coding Exploiting Bright EPR Beam
- Generation of Continuous Variable Einstein-Podolsky-Rosen Entanglement via the Kerr Nonlinearity in an Optical Fibre
- Generation of Bright Two-Color Continuous Variable Entanglement
- An experimental investigation of criteria for continuous variable entanglement
- Experimental verification of a fully inseparable tripartite continuous-variable state
- Characterizing the entanglement of bipartite quantum systems
- Narrowband frequency tunable light source of continuous quadrature entanglement
- Continuous variable entanglement using cold atoms
- Compact Source of EPR Entanglement and Squeezing at Very Low Noise Frequencies
- Polarization squeezing of intense pulses with a fiber Sagnac interferometer
- Time-resolved homodyne characterization of individual quadrature-entangled pulses
- Soliton Squeezing in a Mach-Zehnder Fiber Interferometer
- Sub shot noise phase quadrature measurement of intense light beams
- Experimental demonstration of continuous variable quantum erasing
- All-fibre source of amplitude-squeezed light pulses
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- Conditional measurements on multimode pairwise entangled states from spontaneous parametric downconversion
- Enhancement of parameter estimation by Kerr interaction
- Quantum-enhanced super-sensitivity of Mach-Zehnder interferometer using squeezed Kerr state
- Geometry of perturbed Gaussian states and quantum estimation
- Simulation of Matrix Product States to Unveil the Initial State Dependency of non-Gaussian Dynamics of Kerr Nonlinearity
- Observation of twin beam correlations and quadrature entanglement by frequency doubling in a two-port resonator
- Measuring Quantum Correlations using Lossy Photon-Number-Resolving Detectors with Saturation
- Experimental Demonstration of Macroscopic Quantum Coherence in Gaussian States