Hybrid methods for witnessing entanglement in a microscopic-macroscopic system

Year: 2011

Authors: Spagnolo N., Vitelli C., Paternostro M., De Martini F., Sciarrino F.

Autors Affiliation: Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; Consorzio Nazl Interuniv Sci Fis Mat, I-00185 Rome, Italy; Queens Univ Belfast, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland; Accademia Nazl Lincei, I-00165 Rome, Italy; CNR, Ist Nazl Ott, I-50125 Florence, Italy.

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.

Journal/Review: PHYSICAL REVIEW A

Volume: 84 (3)      Pages from: 32102-1  to: 32102-9

More Information: We acknowledge support by FIRB Futuro in Ricerca HYTEQ and Progetto d’Ateneo of Sapienza Universita di Roma. M. P. is grateful to the Dipartimento di Fisica, Sapienza Universita di Roma, for hospitality and acknowledges support from the UK EPSRC (EP/G004579/1).
KeyWords: Nonlocality
DOI: 10.1103/PhysRevA.84.032102

Citations: 24
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