Abstract
We describe a superconducting qubit derived from operating a properly designed fluxonium circuit in a zero magnetic field. The qubit has a frequency of about 4 GHz and an energy relaxation quality factor Q≈0.7×107, even though the dielectric loss quality factor of the circuit components is in the low-105 range. The Ramsey coherence time exceeds 100μs, and the average fidelity of Clifford gates is benchmarked to F>0.999. These figures are expected to improve with optimized fabrication and measurement procedures. Our work establishes a ready-to-use “partially protected” superconducting qubit functioning in the frequency range of conventional transmons. Published by the American Physical Society 2024
Published Version
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