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Phys. Rev. B 76, 024512 (2007) [4 pages]

Stability of longitudinal coupling for Josephson charge qubits

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Carsten Hutter1,2, Yuriy Makhlin3, Alexander Shnirman1, and Gerd Schön1
1Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe, D-76128 Karlsruhe, Germany
2Department of Physics, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden
3Landau Institute for Theoretical Physics, Kosygin Street 2, 119334 Moscow, Russia

Received 20 January 2007; revised 6 June 2007; published 19 July 2007

For inductively coupled superconducting quantum bits, we determine the conditions when the coupling commutes with the single-qubit terms. We show that in certain parameter regimes such longitudinal coupling can be stabilized with respect to variations of the circuit parameters. In addition, we analyze its stability against fluctuations of the control fields.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.024512
DOI:
10.1103/PhysRevB.76.024512
PACS:
85.25.Hv, 03.67.Lx, 74.81.Fa, 85.25.Cp
 
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