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Phys. Rev. B 76, 064531 (2007) [5 pages]

Non-Gaussian dephasing in flux qubits due to 1∕f noise

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Y. M. Galperin1,2,3,*, B. L. Altshuler4,5, J. Bergli6, D. Shantsev6, and V. Vinokur2
1Department of Physics and Center of Advanced Materials and Nanotechnology, University of Oslo, P.O. Box 1048 Blindern, 0316 Oslo, Norway
2Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
3A. F. Ioffe Physico-Technical Institute of Russian Academy of Sciences, 194021 St. Petersburg, Russia
4Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027, USA
5NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540, USA
6Department of Physics, University of Oslo, P.O. Box 1048 Blindern, 0316 Oslo, Norway

Received 26 December 2006; revised 30 April 2007; published 27 August 2007

Recent experiments by Yoshihara et al. Phys. Rev. Lett. 97 167001 (2006)] provided information on decoherence of the echo signal in Josephson-junction flux qubits at various bias conditions. These results were interpreted assuming a Gaussian model for the decoherence due to 1∕f noise. Here we revisit this problem on the basis of the exactly solvable spin-fluctuator model reproducing detailed properties of the 1∕f noise interacting with a qubit. We consider the time dependence of the echo signal and conclude that the results based on the Gaussian assumption need essential reconsideration.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.064531
DOI:
10.1103/PhysRevB.76.064531
PACS:
03.65.Yz, 85.25.Cp

*iouri.galperine@fys.uio.no

 
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