Resonant effects in a SQUID qubit subjected to nonadiabaticchanges

Antonino Messina, Anna Napoli, Samuele Spilla, Samuele Spilla, Chiarello, Torrioli, Cosmelli, Rosanna Migliore, Castellano

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1 Citation (Scopus)

Abstract

By quickly modifying the shape of the effective potential of a double SQUID flux qubit from asingle well to a double well condition, we experimentally observe an anomalous behavior, namely an alternance 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 simulationof the time evolution of the system indeed suggests that the observed anomalous behavior can beimputable to quantum coherence effects. The interplay among all these mechanisms has a practicalimplication for quantum computing purposes, giving a direct measurement of the limits on thesweeping rates possible for a correct manipulation of the qubit state by means of fast flux pulses,avoiding transitions to non-computational states.
Original languageEnglish
Pages (from-to)134506-1-134506-6
Number of pages7
JournalPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume89
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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