Hybrid methods for witnessing entanglement in a microscopic-macroscopic system

N. Spagnolo, C. Vitelli, Mauro Paternostro, F. De Martini, F. Sciarrino

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


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.
Original languageEnglish
Article number032102
Pages (from-to)032102
Number of pages1
JournalPhysical Review A
Issue number3
Publication statusPublished - 02 Sept 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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