Macroscopic quantum tunneling in quartic and sextic potentials: Application to a phase qubit (Articolo in rivista)

Type
Label
  • Macroscopic quantum tunneling in quartic and sextic potentials: Application to a phase qubit (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.85.104522 (literal)
Alternative label
  • Didier, N.; Hekking, F. W. J. (2012)
    Macroscopic quantum tunneling in quartic and sextic potentials: Application to a phase qubit
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Didier, N.; Hekking, F. W. J. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 85 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 8 (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; Joseph Fourier University; Centre National de la Recherche Scientifique (CNRS) (literal)
Titolo
  • Macroscopic quantum tunneling in quartic and sextic potentials: Application to a phase qubit (literal)
Abstract
  • Macroscopic quantum tunneling of the phase is a fundamental phenomenon in the quantum dynamics of superconducting nanocircuits. The tunneling rate can be controlled in such circuits, where the potential landscape for the phase can be tuned with different external bias parameters. Precise theoretical knowledge of the macroscopic quantum tunneling rate is required in order to simulate and understand the experiments. We present a derivation, based on the instanton technique, of an analytical expression of the escape rate in general quartic and symmetric sextic potentials comprising two escape paths. These new potentials were recently realized when creating a noise-insensitive phase qubit in the camelback potential of a dc SQUID. (literal)
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