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Phys. Rev. B 71, 134501 (2005) [10 pages]

Influence of low-frequency noise on macroscopic quantum tunneling in superconducting circuits

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Mathias Duckheim1,*,† and Joachim Ankerhold1,2
1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany
2Service de Physique de l’Etat Condensé, DSM/DRECAM, CEA Saclay, 91191 Gif-sur-Yvette, France

Received 11 November 2004; published 4 April 2005

The influence of low- to moderate-frequency environments on macroscopic quantum tunneling (MQT) in superconducting circuits is studied within the ImF approach to evaluate tunneling rates. Particular attention is paid to two model environments, namely, a pure sluggish bath and a sluggish bath with additional 1∕f noise. General findings are applied to Zener flip tunneling, a MQT phenomenon recently predicted and observed in a superconducting circuit implementing a quantum bit.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.71.134501
DOI:
10.1103/PhysRevB.71.134501
PACS:
74.50.+r, 05.40.−a, 85.25.Cp, 03.67.Lx

*Electronic address: mathias.duckheim@unibas.ch

†Present address: Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.

 
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