Phys. Rev. Lett. 92, 178301 (2004) [4 pages]

Dephasing of Solid-State Qubits at Optimal Points

Abstract

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Yuriy Makhlin^1,2 and Alexander Shnirman¹
¹Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany
²Landau Institute for Theoretical Physics, Kosygin street 2, 117940 Moscow, Russia

Received 14 August 2003; published 29 April 2004

Motivated by recent experiments with Josephson-junction circuits, we analyze the influence of various noise sources on the dynamics of two-level systems at optimal operation points where the linear coupling to low-frequency fluctuations is suppressed. We study the decoherence due to nonlinear (quadratic) coupling, focusing on the experimentally relevant 1/f and Ohmic noise power spectra. For 1/f noise strong higher-order effects influence the evolution.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.92.178301

DOI:

10.1103/PhysRevLett.92.178301

PACS:

85.25.Cp, 03.65.Yz, 75.10.Jm

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Phys. Rev. Lett. 92, 178301 (2004) [4 pages]

Dephasing of Solid-State Qubits at Optimal Points