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A Compound Josephson Junction Coupler for Flux Qubits With Minimal Crosstalk

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arxiv 0904.3784 v3 pith:CBPQ5DPG submitted 2009-04-24 cond-mat.supr-con

R. Harris , T. Lanting , A.J. Berkley , J. Johansson , M.W. Johnson , P. Bunyk , E. Ladizinsky , N. Ladizinsky
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T. Oh Siyuan Han
This is my paper · ORCID
classification cond-mat.supr-con
keywords couplerqubitscompoundcrosstalkfluxjosephsonjunctionminimal
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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.

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