A Compound Josephson Junction Coupler for Flux Qubits With Minimal Crosstalk
arXiv:0904.3784 · doi:10.1103/PhysRevB.80.052506
Abstract
An improved tunable coupling element for building networks of coupled rf-SQUID flux qubits has been experimentally demonstrated. This new form of coupler, based upon 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.
5 pages, 5 figures. Updated text and Figure 4
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