Coherent Oscillations in a Superconducting Multilevel Quantum System

J. Claudon, F. Balestro, F. W. J. Hekking, and O. Buisson
Phys. Rev. Lett. 93, 187003 – Published 26 October 2004

Abstract

We have observed coherent oscillations in a multilevel quantum system, formed by a current-biased dc SQUID. These oscillations have been induced by applying resonant microwave pulses of flux. Quantum measurement is performed by a nanosecond flux pulse that projects the final state onto one of two different voltage states of the dc SQUID, which can be read out. The number of quantum states involved in the coherent oscillations increases with increasing microwave power. The dependence of the oscillation frequency on microwave power deviates strongly from the linear regime expected for a two-level system and can be very well explained by a theoretical model taking into account the anharmonicity of the multilevel system.

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  • Received 7 April 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.187003

©2004 American Physical Society

Authors & Affiliations

J. Claudon1, F. Balestro1,2, F. W. J. Hekking3, and O. Buisson1

  • 1Centre de Recherches sur les Très Basses Températures, laboratoire associé à l’Université Joseph Fourier, CNRS, BP 166, 38042 Grenoble cedex 9, France
  • 2Department of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
  • 3Laboratoire de Physique et Modélisation des Milieux Condensés, Université Joseph Fourier, CNRS, BP 166, 38042 Grenoble cedex 9, France

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Issue

Vol. 93, Iss. 18 — 29 October 2004

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