Entangling flux qubits with a bipolar dynamic inductance

B. L.T. Plourde, J. Zhang, K. B. Whaley, F. K. Wilhelm, T. L. Robertson, T. Hime, S. Linzen, P. A. Reichardt, C. E. Wu, John Clarke

Research output: Contribution to journalArticlepeer-review

97 Scopus citations


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.

Original languageEnglish (US)
Article number140501
Pages (from-to)140501-1-140501-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
StatePublished - Oct 2004
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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