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Flux qubits and readout device with two independent flux lines

B. L. T. Plourde, T. L. Robertson, P. A. Reichardt, T. Hime, S. Linzen, C.-E. Wu, and John Clarke
Phys. Rev. B 72, 060506(R) – Published 17 August 2005

Abstract

We report measurements on two superconducting flux qubits coupled to a readout superconducting quantum interference device (SQUID). Two on-chip flux bias lines allow independent flux control of any two of the three elements, as illustrated by a two-dimensional qubit flux map. The application of microwaves yields a frequency-flux dispersion curve for 1- and 2-photon driving of the single-qubit excited state, and coherent manipulation of the single-qubit state results in Rabi oscillations and Ramsey fringes. This architecture should be scalable to many qubits and SQUIDs on a single chip.

    • Received 16 May 2005

    DOI:https://doi.org/10.1103/PhysRevB.72.060506

    ©2005 American Physical Society

    Authors & Affiliations

    B. L. T. Plourde*, T. L. Robertson, P. A. Reichardt, T. Hime, S. Linzen, C.-E. Wu, and John Clarke

    • Department of Physics, University of California, Berkeley, California 94720-7300, USA

    • *Present address: Department of Physics, Syracuse University, Syracuse, NY 13244–1130, USA.
    • Present address: Proteus Biomedical, 750 Chesapeake Drive, Redwood City, CA 94063, USA.
    • Present address: Department of Quantum Electronics, Institute for Physical High Technology, Albert-Einstein-Strasse 9, 07745 Jena, Germany.

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    Issue

    Vol. 72, Iss. 6 — 1 August 2005

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