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

doi:10.1103/PhysRevB.70.140501

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 journal › Article › peer-review

96 Scopus citations

Abstract

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 language	English (US)
Article number	140501
Pages (from-to)	140501-1-140501-4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.70.140501
State	Published - Oct 2004
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.70.140501

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AU - Zhang, J.

AU - Whaley, K. B.

AU - Wilhelm, F. K.

AU - Robertson, T. L.

AU - Hime, T.

AU - Linzen, S.

AU - Reichardt, P. A.

AU - Wu, C. E.

AU - Clarke, John

PY - 2004/10

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AB - 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.

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Entangling flux qubits with a bipolar dynamic inductance

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