Hybrid methods for witnessing entanglement in a microscopic-macroscopic system

Abstract

We propose a hybrid approach to the experimental assessment of the genuine quantum features of a general system consisting of microscopic and macroscopic parts. We infer entanglement by combining dichotomic measurements on a bidimensional system and phase-space inference through the Wigner distribution associated with the macroscopic component of the state. As a benchmark, we investigate the feasibility of our proposal in a bipartite-entangled state composed of a single-photon and a multiphoton field. Our analysis shows that, under ideal conditions, maximal violation of a Clauser-Horne-Shimony-Holt-based inequality is achievable regardless of the number of photons in the macroscopic part of the state. The difficulty in observing entanglement when losses and detection inefficiency are included can be overcome by using a hybrid entanglement witness that allows efficient correction for losses in the few-photon regime.

9 pages, 5 figures

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• Violation of Bell-CHSH inequality using imperfect photodetectors with optical hybrid states
• Investigating macroscopic quantum superpositions and the quantum-to-classical transition by optical parametric amplification
• Characterizations and Quantifications of Macroscopic Quantumness and Its Implementations using Optical Fields
• Creating and detecting micro-macro photon-number entanglement by amplifying and de-amplifying a single-photon entangled state
• Non-classicality of optomechanical devices in experimentally realistic operating regimes
• Proposal for Inverting the Quantum Cloning of Photons
• Using macroscopic entanglement to close the detection loophole in Bell inequality
• Violation of Bell inequalities in larger Hilbert spaces: robustness and challenges
• Bell inequality test with entanglement between an atom and a coherent state in a cavity
• Non-Markovian effects on non-locality of a qubit-oscillator system
• Generation of entanglement via squeezing on a tripartite-optomechanical system
• Complementarity between micro-micro and micro-macro entanglement in a Bose-Einstein condensate with two Rydberg impurities
• Conditions on detecting tripartite entangled state in psychophysical experiments
• Witnessing entanglement via the geometric phase in a impurity-doped Bose-Einstein condensate