Coherence correlations in planar fluxonium qubits*

Superconducting qubits have demonstrated promise as a technology with which to build a quantum computer. A current roadblock to creating such a processor with these circuits is their finite coherence time, which limits gate fidelity. Fluxonium qubits have exhibited long coherence times and could be an avenue towards a high-coherence quantum processor. This work studies data on the circuit parameters, coherence, and single-qubit gate fidelities of planar aluminum-on-silicon fluxoniums. We consider data gathered for the purpose of collecting statistics on device performance, understanding how measured coherence times correlate with device parameters and achievable gate fidelities, and identifying the dominant loss mechanisms limiting device coherence.  

 

This material is based upon work supported under Air Force Contract No. FA8702-15-D-0001. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the U.S. government or the U.S. Air Force.