Quantum discord determines the interferometric power of quantum states (Articolo in rivista)

Type
Label
  • Quantum discord determines the interferometric power of quantum states (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevLett.112.210401 (literal)
Alternative label
  • Girolami D.; Souza A.M.; Giovannetti V.; Tufarelli T.; Filgueiras J.G.; Sarthour R.S.; Soares-Pinto D.O.; Oliveira I.S.; Adesso G. (2014)
    Quantum discord determines the interferometric power of quantum states
    in Physical review letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Girolami D.; Souza A.M.; Giovannetti V.; Tufarelli T.; Filgueiras J.G.; Sarthour R.S.; Soares-Pinto D.O.; Oliveira I.S.; Adesso G. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84901660706&partnerID=q2rCbXpz (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 112 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 21 (literal)
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom; Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117583 Singapore, Singapore; Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, Rio de Janeiro, 22290-180 Rio de Janeiro, Brazil; NEST, Scuola Normale Superiore, Istituto Nanoscienze-CNR, Piazza dei Cavalieri 7, I-56126 Pisa, Italy; QOLS, Blackett Laboratory, Imperial College London, London SW7 2BW, United Kingdom; Fakultät Physik, Technische Universität Dortmund, 44221 Dortmund, Germany; Instituto de Física de São Carlos, Universidade de São Paulo, P.O. Box 369, São Carlos, 13560-970 São Paulo, Brazil; Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom (literal)
Titolo
  • Quantum discord determines the interferometric power of quantum states (literal)
Abstract
  • Quantum metrology exploits quantum mechanical laws to improve the precision in estimating technologically relevant parameters such as phase, frequency, or magnetic fields. Probe states are usually tailored to the particular dynamics whose parameters are being estimated. Here we consider a novel framework where quantum estimation is performed in an interferometric configuration, using bipartite probe states prepared when only the spectrum of the generating Hamiltonian is known. We introduce a figure of merit for the scheme, given by the worst-case precision over all suitable Hamiltonians, and prove that it amounts exactly to a computable measure of discord-type quantum correlations for the input probe. We complement our theoretical results with a metrology experiment, realized in a highly controllable room-temperature nuclear magnetic resonance setup, which provides a proof-of-concept demonstration for the usefulness of discord in sensing applications. Discordant probes are shown to guarantee a nonzero phase sensitivity for all the chosen generating Hamiltonians, while classically correlated probes are unable to accomplish the estimation in a worst-case setting. This work establishes a rigorous and direct operational interpretation for general quantum correlations, shedding light on their potential for quantum technology. © 2014 American Physical Society. (literal)
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