An improved tunable coupling element for building networks of coupled rf-superconducting quantum interference device (rf-SQUID) flux qubits has been experimentally demonstrated. This new form of coupler, based on the compound Josephson-junction rf-SQUID, provides a sign and magnitude tunable mutual inductance between qubits with minimal nonlinear crosstalk from the coupler tuning parameter into the qubits. Quantitative agreement is shown between an effective one-dimensional model of the coupler’s potential and measurements of the coupler persistent current and susceptibility.
This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevB.80.052506.
R. Harris, T. Lanting, A. J. Berkley, J. Johansson, M. W. Johnson, P. Bunyk, E. Ladizinsky, N. Ladizinsky, T. Oh, and S. Han. "Compound Josephson-junction coupler for flux qubits with minimal crosstalk." Phys. Rev. B 80, 052506 – Published 20 August 2009. http://dx.doi.org/10.1103/PhysRevB.80.052506
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