1/f Flux Noise in Josephson Phase Qubits

Radoslaw C. Bialczak, R. McDermott, M. Ansmann, M. Hofheinz, N. Katz, Erik Lucero, Matthew Neeley, A. D. O’Connell, H. Wang, A. N. Cleland, and John M. Martinis
Phys. Rev. Lett. 99, 187006 – Published 2 November 2007

Abstract

We present a new method to measure 1/f noise in Josephson quantum bits (qubits) that yields low-frequency spectra below 1 Hz. A comparison of the noise taken at positive and negative bias of a phase qubit shows the dominant noise source to be flux noise and not junction critical-current noise, with a magnitude similar to that measured previously in other systems. Theoretical calculations show that the level of flux noise is not compatible with the standard model of noise from two-level state defects in the surface oxides of the films.

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  • Received 11 August 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.187006

©2007 American Physical Society

Authors & Affiliations

Radoslaw C. Bialczak1, R. McDermott2, M. Ansmann1, M. Hofheinz1, N. Katz1, Erik Lucero1, Matthew Neeley1, A. D. O’Connell1, H. Wang1, A. N. Cleland1, and John M. Martinis1,*

  • 1Department of Physics, University of California, Santa Barbara, California 93106, USA
  • 2Department of Physics, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA

  • *martinis@physics.ucsb.edu

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Vol. 99, Iss. 18 — 2 November 2007

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