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    Experimental Demonstration of a Robust and Scalable Flux Qubit

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    HanSiyuan_PRB_2010(81)134510.pdf (1.271Mb)
    Issue Date
    2010-04-07
    Author
    Harris, R.
    Johansson, J.
    Berkley, A. J.
    Johnson, M. W.
    Lanting, T.
    Han, Siyuan
    Bunyk, P.
    Ladizinsky, E.
    Oh, T.
    Perminov, I.
    Tolkacheva, E.
    Uchaikin, S.
    Chapple, E. M.
    Enderud, C.
    Rich, C.
    Thom, M.
    Wang, J. C.
    Wilson, B.
    Rose, G.
    Publisher
    American Physical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    A rf–superconducting quantum interference device (SQUID) flux qubit that is robust against fabrication variations in Josephson-junction critical currents and device inductance has been implemented. Measurements of the persistent current and of the tunneling energy between the two lowest-lying states, both in the coherent and incoherent regimes, are presented. These experimental results are shown to be in agreement with predictions of a quantum-mechanical Hamiltonian whose parameters were independently calibrated, thus justifying the identification of this device as a flux qubit. In addition, measurements of the flux and critical current noise spectral densities are presented that indicate that these devices with Nb wiring are comparable to the best Al wiring rf SQUIDs reported in the literature thus far, with a 1/f flux noise spectral density at 1 Hz of 1.3+0.7−0.5 μΦ0/Hz−−√. An explicit formula for converting the observed flux noise spectral density into a free-induction-decay time for a flux qubit biased to its optimal point and operated in the energy eigenbasis is presented.
    Description
    This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevB.81.134510.
    URI
    http://hdl.handle.net/1808/17503
    DOI
    https://doi.org/10.1103/PhysRevB.81.134510
    Collections
    • Physics and Astronomy Scholarly Works [1538]
    Citation
    R. Harris, J. Johansson, A. J. Berkley, M. W. Johnson, T. Lanting, Siyuan Han, P. Bunyk, E. Ladizinsky, T. Oh, I. Perminov, E. Tolkacheva, S. Uchaikin, E. M. Chapple, C. Enderud, C. Rich, M. Thom, J. Wang, B. Wilson, and G. Rose. "Experimental demonstration of a robust and scalable flux qubit." Phys. Rev. B 81, 134510 – Published 7 April 2010. http://dx.doi.org/10.1103/PhysRevB.81.134510.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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