Phys. Rev. B 70, 140501(R) (2004) [4 pages]

Entangling flux qubits with a bipolar dynamic inductance

Abstract

References

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B. L. T. Plourde¹, J. Zhang^2,3, K. B. Whaley³, F. K. Wilhelm⁴, T. L. Robertson⁴, T. Hime, S. Linzen¹, P. A. Reichardt¹, C.-E. Wu¹, and John Clarke¹
¹Department of Physics, University of California, Berkeley, California 94720, USA
²Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA
³Department of Chemistry, University of California, Berkeley, California 94720, USA
⁴Department Physik and CeNS, Ludwig-Maximilians-Universität, Theresienstr. 37, 80333 München, Germany

Received 4 May 2004; published 5 October 2004

We propose a scheme to implement controllable coupling between two flux qubits using the screening current response of a dc superconducting quantum interference device (SQUID). The coupling strength is adjusted by the current bias applied to the SQUID and can be varied continuously from positive to negative values, allowing cancellation of the direct mutual inductance between the qubits. We show that this variable coupling scheme permits efficient realization of universal quantum logic. The same SQUID can be used to determine the flux states of the qubits.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.70.140501

DOI:

10.1103/PhysRevB.70.140501

PACS:

85.25.Cp, 03.67.Lx, 85.25.Dq

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Phys. Rev. B 70, 140501(R) (2004) [4 pages]

Entangling flux qubits with a bipolar dynamic inductance