Integer Fluxonium Qubit

• URL: http://arxiv.org/abs/2403.16780v2
• Date: Wed, 25 Sep 2024 14:36:45 GMT
• Title: Integer Fluxonium Qubit
• Authors: Raymond A. Mencia, Wei-Ju Lin, Hyunheung Cho, Maxim G. Vavilov, Vladimir E. Manucharyan,
• Abstract summary: 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 $Q approx 0.7times 107$. Our work establishes a ready-to-use partially protected" superconducting qubit functioning in the frequency range of conventional transmons.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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 $Q \approx 0.7\times 10^7$, even though the dielectric loss quality factor of the circuit components is in the low $10^5$ range. The Ramsey coherence time exceeds 100 $\mu$s, and the average fidelity of Clifford gates is benchmarked to $\mathcal{F} > 0.999$. 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.

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