Multipath interferometer with ultracold atoms trapped in an optical lattice (Articolo in rivista)

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Label
  • Multipath interferometer with ultracold atoms trapped in an optical lattice (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevA.87.033607 (literal)
Alternative label
  • Chwedenczuk, J.; Piazza, F.; Smerzi, A. (2013)
    Multipath interferometer with ultracold atoms trapped in an optical lattice
    in Physical review. A
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Chwedenczuk, J.; Piazza, F.; Smerzi, A. (literal)
Pagina inizio
  • 033607 (literal)
Pagina fine
  • 033607 (literal)
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  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84874843252&partnerID=q2rCbXpz (literal)
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  • 87 (literal)
Rivista
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  • 10 (literal)
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  • 3 (literal)
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  • ISI Web of Science (WOS) (literal)
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Faculty of Physics, University of Warsaw, ul. Hoza 69, PL-00-681 Warszawa, Poland; Physik Department, Technische Universität München, D-85747 Garching, Germany; QSTAR Center for Quantum Science and Technology, CNR-INO, LENS, Largo Enrico Fermi 2, I-50125 Arcetri, Italy (literal)
Titolo
  • Multipath interferometer with ultracold atoms trapped in an optical lattice (literal)
Abstract
  • We study an ultracold gas of N bosons trapped in a one-dimensional M-site optical lattice perturbed by a spatially dependent potential gx(j), where the unknown coupling strength g is to be estimated. We find that the measurement uncertainty is bounded by Delta g alpha 1/N(M-j-1). For a typical case of a linear potential, the sensitivity improves as M-1, which is a result of multiple interferences between the sites, an advantage of multipath interferometers over two-mode setups. Next, we calculate the estimation sensitivity for a specific measurement where, after the action of the potential, the particles are released from the lattice and form an interference pattern. If the parameter is estimated by a least-squares fit of the average density to the interference pattern, the sensitivity still scales like M-1 for linear potentials. We finally discuss the role of useful entanglement of the initial state in the lattice to beat the shot-noise limit. DOI: 10.1103/PhysRevA.87.033607 (literal)
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