Entanglement-assisted tomography of a quantum target (Articolo in rivista)

Type
Label
  • Entanglement-assisted tomography of a quantum target (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1751-8113/45/10/105309 (literal)
Alternative label
  • De Pasquale, A.; Facchi, P.; Giovannetti, V.; Yuasa, K. (2012)
    Entanglement-assisted tomography of a quantum target
    in Journal of physics. A, Mathematical and theoretical (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • De Pasquale, A.; Facchi, P.; Giovannetti, V.; Yuasa, K. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 45 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 19 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 10 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Scuola Normale Superiore di Pisa; Consiglio Nazionale delle Ricerche (CNR)NANO; University of Bari; University of Bari; Istituto Nazionale di Fisica Nucleare; Waseda University (literal)
Titolo
  • Entanglement-assisted tomography of a quantum target (literal)
Abstract
  • We study the efficiency of quantum tomographic reconstruction where the system under investigation (quantum target) is indirectly monitored by looking at the state of a quantum probe that has been scattered off the target. In particular, we focus on the state tomography of a qubit through a one-dimensional scattering of a probe qubit, with a Heisenberg-type interaction. Via direct evaluation of the associated quantum Cramer-Rao bounds, we compare the accuracy efficiency that one can obtain by adopting entanglement-assisted strategies with that achievable when entanglement resources are not available. Even though sub-shot noise accuracy levels are not attainable, we show that quantum correlations play a significant role in the estimation. A comparison with the accuracy levels obtainable by direct estimation (not through a probe) of the quantum target is also performed. (literal)
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