A Compound Josephson Junction Coupler for Flux Qubits With Minimal Crosstalk

Details A Compound Josephson Junction Coupler for Flux Qubits With Minimal Crosstalk A Compound Josephson Junction Coupler for Flux Qubits With Minimal Crosstalk

2009-04-24

arxiv.org/abs/0904.3784v3

Phys. Rev. B 80, 052506 (2009)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures. Updated text and Figure 4

Scientific paper

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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