A Compound Josephson Junction Coupler for Flux Qubits With Minimal Crosstalk
R. Harris, T. Lanting, A.J. Berkley, J. Johansson, M.W. Johnson, P., Bunyk, E. Ladizinsky, N. Ladizinsky, T. Oh, Siyuan Han
TL;DR
This paper introduces a novel compound Josephson junction coupler for flux qubits that enables tunable mutual inductance with minimal crosstalk, enhancing the control and scalability of quantum circuits.
Contribution
It presents an experimentally demonstrated coupler based on the compound Josephson junction rf-SQUID, offering sign and magnitude tunability with reduced nonlinear crosstalk.
Findings
Quantitative agreement between model and measurements
Minimal nonlinear crosstalk achieved
Effective tunable mutual inductance demonstrated
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.
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