Resonant effects in a SQUID qubit subjected to nonadiabatic changes (Articolo in rivista)

Type
Label
  • Resonant effects in a SQUID qubit subjected to nonadiabatic changes (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.89.134506 (literal)
Alternative label
  • Chiarello F.; Spilla S.; Castellano M.G.; Cosmelli C.; Messina A.; Migliore R.; Napoli A.; Torrioli G. (2014)
    Resonant effects in a SQUID qubit subjected to nonadiabatic changes
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Chiarello F.; Spilla S.; Castellano M.G.; Cosmelli C.; Messina A.; Migliore R.; Napoli A.; Torrioli G. (literal)
Pagina inizio
  • 134506 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84899767815&partnerID=q2rCbXpz (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 89 (literal)
Rivista
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  • 13 (literal)
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • IFN-CNR, via Cineto Romano 42, 00156 Rome, Italy; Institut für Theorie der Statistischen Physik, RWTH Aachen University, D-52056 Aachen, Germany; Dip. Physics, Università di Roma Sapienza, 00185 Rome, Italy; Institute of Biophysics, National Research Council, via Ugo La Malfa 153, 90146 Palermo, Italy; Dipartimento di Fisica e Chimica, Università di Palermo, I-90123 Palermo, Italy (literal)
Titolo
  • Resonant effects in a SQUID qubit subjected to nonadiabatic changes (literal)
Abstract
  • By quickly modifying the shape of the effective potential of a double SQUID flux qubit from a single-well to a double-well condition, we experimentally observe an anomalous behavior, namely, an alternation of resonance peaks, in the probability to find the qubit in a given flux state. The occurrence of Landau-Zener transitions as well as resonant tunneling between degenerate levels in the two wells may be invoked to partially justify the experimental results. A quantum simulation of the time evolution of the system indeed suggests that the observed anomalous behavior can be imputable to quantum coherence effects. The interplay among all these mechanisms has a practical implication for quantum computing purposes, giving a direct measurement of the limits on the sweeping rates possible for a correct manipulation of the qubit state by means of fast flux pulses, avoiding transitions to noncomputational states. © 2014 American Physical Society. (literal)
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