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Probing high-frequency noise with macroscopic resonant tunneling

T. Lanting, M. H. S. Amin, M. W. Johnson, F. Altomare, A. J. Berkley, S. Gildert, R. Harris, J. Johansson, P. Bunyk, E. Ladizinsky, E. Tolkacheva, and D. V. Averin
Phys. Rev. B 83, 180502(R) – Published 10 May 2011

Abstract

We have developed a method for extracting the high-frequency noise spectral density of an rf-SQUID flux qubit from macroscopic resonant tunneling (MRT) rate measurements. The extracted noise spectral density is consistent with that of an ohmic environment up to frequencies ~4 GHz. We have also derived an expression for the MRT line shape expected for a noise spectral density consisting of such a broadband ohmic component and an additional strongly peaked low-frequency component. This hybrid model provides an excellent fit to experimental data across a range of tunneling amplitudes and temperatures.

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  • Received 10 March 2011

DOI:https://doi.org/10.1103/PhysRevB.83.180502

©2011 American Physical Society

Authors & Affiliations

T. Lanting1, M. H. S. Amin1, M. W. Johnson1, F. Altomare1, A. J. Berkley1, S. Gildert1, R. Harris1, J. Johansson2, P. Bunyk1, E. Ladizinsky1, E. Tolkacheva1, and D. V. Averin3

  • 1D-Wave Systems, Inc., 100-4401 Still Creek Drive, Burnaby, BC V5C 6G9, Canada
  • 2Department of Natural Sciences, University of Agder, N-4604 Kristiansand, Norway
  • 3Department of Physics and Astronomy, University of Stony Brook, SUNY, Stony Brook, NY 11794, USA

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Vol. 83, Iss. 18 — 1 May 2011

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