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Title: 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.

Authors:
 [1];  [2];  [1];  [3];  [1];  [2];  [1];  [4]
  1. Dipartimento di Fisica, Sapienza Universita di Roma, Piazzale Aldo Moro 5, I-00185 Roma (Italy)
  2. (Italy)
  3. School of Mathematics and Physics, Queen's University, BT 7 1NN Belfast (United Kingdom)
  4. (INO-CNR), largo E. Fermi 6, I-50125 Firenze (Italy)
Publication Date:
OSTI Identifier:
22068624
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: (c) 2011 American Institute of Physics; Country of input: Syrian Arab Republic; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Spagnolo, Nicolo, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Piazzale Aldo Moro 5, I-00185 Roma, Vitelli, Chiara, Paternostro, Mauro, De Martini, Francesco, Accademia Nazionale dei Lincei, via della Lungara 10, I-00165 Roma, Sciarrino, Fabio, and Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche. Hybrid methods for witnessing entanglement in a microscopic-macroscopic system. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.032102.
Spagnolo, Nicolo, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Piazzale Aldo Moro 5, I-00185 Roma, Vitelli, Chiara, Paternostro, Mauro, De Martini, Francesco, Accademia Nazionale dei Lincei, via della Lungara 10, I-00165 Roma, Sciarrino, Fabio, & Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche. Hybrid methods for witnessing entanglement in a microscopic-macroscopic system. United States. doi:10.1103/PHYSREVA.84.032102.
Spagnolo, Nicolo, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Piazzale Aldo Moro 5, I-00185 Roma, Vitelli, Chiara, Paternostro, Mauro, De Martini, Francesco, Accademia Nazionale dei Lincei, via della Lungara 10, I-00165 Roma, Sciarrino, Fabio, and Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche. Thu . "Hybrid methods for witnessing entanglement in a microscopic-macroscopic system". United States. doi:10.1103/PHYSREVA.84.032102.
@article{osti_22068624,
title = {Hybrid methods for witnessing entanglement in a microscopic-macroscopic system},
author = {Spagnolo, Nicolo and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Piazzale Aldo Moro 5, I-00185 Roma and Vitelli, Chiara and Paternostro, Mauro and De Martini, Francesco and Accademia Nazionale dei Lincei, via della Lungara 10, I-00165 Roma and Sciarrino, Fabio and Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche},
abstractNote = {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.},
doi = {10.1103/PHYSREVA.84.032102},
journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}