Hybrid methods for witnessing entanglement in a microscopic-macroscopic system

Journal Article · Thu Sep 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.032102· OSTI ID:22068624

Spagnolo, Nicolo ^[1]; Vitelli, Chiara ^[1]; Paternostro, Mauro ^[2]; De Martini, Francesco ^[1]; Sciarrino, Fabio ^[1]

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1. Dipartimento di Fisica, Sapienza Universita di Roma, Piazzale Aldo Moro 5, I-00185 Roma (Italy)
2. School of Mathematics and Physics, Queen's University, BT 7 1NN Belfast (United Kingdom)

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.

• OSTI ID: 22068624
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 84; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BENCHMARKS
CORRECTIONS
HYBRIDIZATION
MULTI-PHOTON PROCESSES
PHASE SPACE
PHOTONS
QUANTUM ENTANGLEMENT
WIGNER DISTRIBUTION