A tunable rf SQUID manipulated as flux and phase qubit (Articolo in rivista)

Type
Label
  • A tunable rf SQUID manipulated as flux and phase qubit (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0031-8949/2009/T137/014011 (literal)
Alternative label
  • S Poletto; F Chiarello; M G Castellano; J Lisenfeld; A Lukashenko; P Carelli; A V Ustinov (2009)
    A tunable rf SQUID manipulated as flux and phase qubit
    in Physica scripta. T
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • S Poletto; F Chiarello; M G Castellano; J Lisenfeld; A Lukashenko; P Carelli; A V Ustinov (literal)
Pagina inizio
  • 014011 (literal)
Pagina fine
  • 014016 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • T137 (literal)
Rivista
Note
  • Scopus (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 Physikalisches Institut, Universität Karlsruhe (TH), D-76131 Karlsruhe, Germany 2 Istituto di Fotonica e Nanotecnologie, CNR, 00156 Roma, Italy 3 Dipartimento di Ingegneria Elettrica, Università dell'Aquila, 67040 Monteluco di Roio, Italy (literal)
Titolo
  • A tunable rf SQUID manipulated as flux and phase qubit (literal)
Abstract
  • We report on two different manipulation procedures of a tunable rf superconducting quantum interference device (SQUID). First, we operate this system as a flux qubit, where the coherent evolution between the two flux states is induced by a rapid change of the energy potential, turning it from a double well into a single well. The measured coherent Larmor-like oscillation of the retrapping probability in one of the wells has a frequency ranging from 6 to 20 GHz, with a theoretically expected upper limit of 40 GHz. Furthermore, here we also report a manipulation of the same device as a phase qubit. In the phase regime, the manipulation of the energy states is realized by applying a resonant microwave drive. In spite of the conceptual difference between these two manipulation procedures, the measured decay times of Larmor oscillation and microwave-driven Rabi oscillation are rather similar. Due to the higher frequency of the Larmor oscillations, the microwave-free qubit manipulation allows for much faster coherent operations. (literal)
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