How to measure squeezing and entanglement of Gaussian states without homodyning

Abstract

We propose a scheme for measuring the squeezing, purity, and entanglement of Gaussian states of light that does not require homodyne detection. The suggested setup only needs beam splitters and single-photon detectors. Two-mode entanglement can be detected from coincidences between photodetectors placed on the two beams.

arXiv comment4 pages, 2 figures, RevTeX

References in corpus (15)

• A computable measure of entanglement
• Quantum information with continuous variables
• Peres-Horodecki separability criterion for continuous variable systems
• Inseparability criterion for continuous variable systems
• Direct estimations of linear and non-linear functionals of a quantum state
• Universal Quantum Estimator
• Entanglement of formation for symmetric Gaussian states
• Direct detection of quantum entanglement
• Driving non-Gaussian to Gaussian states with linear optics
• Gaussian Entanglement of Formation
• Purity of Gaussian states: measurement schemes and time-evolution in noisy channels
• Determination of continuous variable entanglement by purity measurements
• A device for feasible fidelity, purity, Hilbert-Schmidt distance and entanglement witness measurements
• Experimentally realizable characterizations of continuous variable Gaussian states
• Simple optical measurement of the overlap and fidelity of quantum states: An experiment

Cited by in corpus (31)

• Quantum entanglement
• Entanglement in continuous variable systems: Recent advances and current perspectives
• Extremal entanglement and mixedness in continuous variable systems
• A computable measure of nonclassicality for light
• Gaussian measures of entanglement versus negativities: the ordering of two-mode Gaussian states
• Multipartite entanglement in three-mode Gaussian states of continuous variable systems: Quantification, sharing structure and decoherence
• Quantifying non-Gaussianity for quantum information
• Entanglement of two-mode Gaussian states: characterization and experimental production and manipulation
• Optimal entanglement witnesses for continuous-variable systems
• Quantifying decoherence in continuous variable systems
• Photon-subtracted squeezed thermal state: nonclassicality and decoherence
• Quantification and scaling of multipartite entanglement in continuous variable systems
• Quantum and classical correlations of intense beams of light via joint photodetection
• Deep learning of quantum entanglement from incomplete measurements
• Pulsed squeezed vacuum characterization without homodyning
• Storage and retrieval of nonclassical photon pairs and conditional single photons generated by parametric down-conversion process
• Photon--added squeezed thermal states: statistical properties and its decoherence in a photon-loss channel
• Entanglement, Purity, and Information Entropies in Continuous Variable Systems
• Assisted concentration of Gaussian resources
• Maximally polarized states for quantum light fields
• Geometric characterization of separability and entanglement in pure Gaussian states by single-mode unitary operations
• Optimal characterization of Gaussian channels using photon-number-resolving detectors
• Characteristic Time and Maximum Mixedness: Single Mode Gaussian States in Dissipative Channels
• Quantification of Continuous Variable Entanglement with only Two Types of Simple Measurements
• Quantification of Quantum Correlations in Two-Beam Gaussian States Using Photon-Number Measurements
• Multi-mode Gaussian State Analysis with Total Photon Counting
• Quantifying two-mode entanglement of bosonic Gaussian states from their full counting statistics
• Typical Gaussian Quantum Information
• Effect of phase fluctuation and dephasing on the dynamics of entanglement generation in a correlated emission laser
• Multi-mode Gaussian State Analysis with one Bounded Photon Counter
• Robust entanglement detection in arbitrary two-mode Gaussian state: a Stokes-like operator-based approach