Quantum characterization of bipartite Gaussian states
arXiv:1006.0837 · doi:10.1364/JOSAB.27.00A110
Abstract
Gaussian bipartite states are basic tools for the realization of quantum information protocols with continuous variables. Their complete characterization is obtained by the reconstruction of the corresponding covariance matrix. Here we describe in details and experimentally demonstrate a robust and reliable method to fully characterize bipartite optical Gaussian states by means of a single homodyne detector. We have successfully applied our method to the bipartite states generated by a sub-threshold type-II optical parametric oscillator which produces a pair of thermal cross-polarized entangled CW frequency degenerate beams. The method provide a reliable reconstruction of the covariance matrix and allows to retrieve all the physical information about the state under investigation. These includes observable quantities, as energy and squeezing, as well as non observable ones as purity, entropy and entanglement. Our procedure also includes advanced tests for Gaussianity of the state and, overall, represents a powerful tool to study bipartite Gaussian state from the generation stage to the detection one.
References in corpus (13)
- Quantum information can be negative
- Multiphoton Quantum Optics and Quantum State Engineering
- Symplectic invariants, entropic measures and correlations of Gaussian states
- Quantifying the non-Gaussian character of a quantum state by quantum relative entropy
- Purity of Gaussian states: measurement schemes and time-evolution in noisy channels
- Correlation Matrices of Two-Mode Bosonic Systems
- Full characterization of Gaussian bipartite entangled states by a single homodyne detector
- Entanglement and purity of two-mode Gaussian states in noisy channels
- Entanglement oscillations in non-Markovian quantum channels
- Preparation of distilled and purified continuous variable entangled states
- Experimental demonstration of continuous variable purification of squeezed states
- An effective method to estimate multidimensional Gaussian states
- Criteria of quantum correlation in the measurement of continuous variables in optics
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- Detecting quantum non-Gaussianity via the Wigner function
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- Homodyne extimation of quantum states purity by exploiting covariant uncertainty relation
- Experimental analysis of decoherence of quantumness in a continuous variables bi-partite entangled system
- Drawbacks of the use of fidelity to assess quantum resources
- Bell operator and Gaussian squeezed states in noncommutative quantum mechanics
- Continuous-variable entanglement of two bright coherent states that never interacted
- Full quantum state reconstruction of symmetric two-mode squeezed thermal states via spectral homodyne detection
- Continuous-Variable Entangled States of Light carrying Orbital Angular Momentum
- Tunable non-Gaussian resources for continuous-variable quantum technologies
- On the two-dimensional time-dependent anisotropic harmonic oscillator in a magnetic field
- Homodyning the of Gaussian states
- Optomechanical Entanglement of Remote Microwave Cavities
- Different operational meanings of continuous variable Gaussian entanglement criteria and Bell inequalities
- Non-Gaussian state generation certified using the EPR-steering inequality
- Multi-mode Gaussian State Analysis with Total Photon Counting
- Entanglement in phase-space distribution for an anisotropic harmonic oscillator in noncommutative space
- Mixedness and entanglement for two-mode Gaussian states
- Novel technique for the active stabilization of the relative phase between seed and pump in an optical parametric oscillator
- Influence of classic noise on entangled state formation in parametric systems
- Rapid creation of distant entanglement by multiphoton resonant fluorescence
- Experimental pre-assessing entanglement in Gaussian states mixing
- Optomechanical steady state entanglement induced by electrical interaction
- Typical Gaussian Quantum Information
- Asymmetry effects in homodyne and heterodyne measurements: Positive operator-valued measures and asymptotic security of Gaussian-continuous-variable quantum key distribution
- Multi-mode Gaussian State Analysis with one Bounded Photon Counter
- Multi-Operator Quantum Uncertainty Relations from New Cauchy-Schwarz Inequalities