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Phys. Rev. B 72, 060506(R) (2005) [4 pages]

Flux qubits and readout device with two independent flux lines

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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

Received 16 May 2005; published 17 August 2005

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.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.060506
DOI:
10.1103/PhysRevB.72.060506
PACS:
03.67.Lx, 85.25.Cp, 85.25.Dq

*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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