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Phys. Rev. B 72, 134519 (2005) [22 pages]

Decoherence in a superconducting quantum bit circuit

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G. Ithier1, E. Collin1, P. Joyez1, P. J. Meeson1,2, D. Vion1, D. Esteve1, F. Chiarello3, A. Shnirman4, Y. Makhlin4,5, J. Schriefl4,6, and G. Schön4
1Quantronics Group, Service de Physique de l’Etat Condensé, DSM/DRECAM, CEA Saclay, 91191 Gif-sur-Yvette, France
2Department of Physics, Royal Holloway, University of London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom
3Istituto di Fotonica e Nanotecnologia, CNR, Via Cineto Romano, 42 00156 Roma, Italy
4Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany
5Landau Institute for Theoretical Physics, Kosygin street 2, 119334 Moscow, Russia
6Ecole Normale Supérieure de Lyon, 46 Allée d’Italie, 69364 Lyon cedex 07, France

Received 12 May 2005; revised 22 July 2005; published 24 October 2005

Decoherence in quantum bit circuits is presently a major limitation to their use for quantum computing purposes. We present experiments, inspired from NMR, that characterize decoherence in a particular superconducting quantum bit circuit, the quantronium. We introduce a general framework for the analysis of decoherence, based on the spectral densities of the noise sources coupled to the qubit. Analysis of our measurements within this framework indicates a simple model for the noise sources acting on the qubit. We discuss various methods to fight decoherence.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.134519
DOI:
10.1103/PhysRevB.72.134519
PACS:
74.78.−w, 85.25.Cp, 85.25.Am, 03.65.Yz
 
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