Energy-Level Quantization in the Zero-Voltage State of a Current-Biased Josephson Junction

John M. Martinis, Michel H. Devoret, and John Clarke
Phys. Rev. Lett. 55, 1543 – Published 7 October 1985
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Abstract

We report the first observation of quantized energy levels for a macroscopic variable, namely the phase difference across a current-biased Josephson junction in its zero-voltage state. The position of these energy levels is in quantitative agreement with a quantum mechanical calculation based on parameters of the junction that are measured in the classical regime.

  • Received 14 June 1985

DOI:https://doi.org/10.1103/PhysRevLett.55.1543

©1985 American Physical Society

Authors & Affiliations

John M. Martinis, Michel H. Devoret*, and John Clarke

  • Department of Physics, University of California, Berkeley, California 94720, and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720

  • *On leave from Service de Physique du Solide et de Resonance Magnétique, Centre d'Etudes Nucléaires de Saclay, F-91191 Gif-sur-Yvette Cedex, France.

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Vol. 55, Iss. 15 — 7 October 1985

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