SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster: Superconductivity II
TT 58.16: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG3
Flux escape mitigation in gradiometric fluxonium qubits — •Denis Bénâtre1, Mathieu Féchant1, Martin Spiecker1,2, and Ioan Pop1,2 — 1IQMT, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany — 2PHI, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
Superconducting fluxonium qubits have grown in the past decade as an interesting alternative to the now standard transmons. In 2022, Gusenkova et al. proposed a new design, the gradiometric fluxonium qubit, whose two loops have shown to suppress sensitivity to homogeneous magnetic field and open the door for its use in hybrid quantum systems. However, these devices undergo flux escape triggered by radioactive and cosmic impacts, and thus require shielding from ionizing radiation, e.g. in deep-underground facilities [Gusenkova et al., 2022]. We present new designs of gradiometric fluxoniums aimed at intrinsically mitigating the rate of trapped flux escape.