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TT: Fachverband Tiefe Temperaturen

TT 47: Superconducting Electronics: Qubits I (joint session TT/QI)

TT 47.1: Talk

Wednesday, March 20, 2024, 15:00–15:15, H 0104

Simultaneous flux-locking of gradiometric fluxonium qubits — •Denis Bénâtre¹, Mathieu Féchant¹, Nicolas Zapata¹, Patrick Paluch¹, Nicolas Gosling¹, and Ioan Pop^1,2 — ¹IQMT, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany — ²PHI, Karlsruhe Institute of Technology, Karlsruhe, Germany

Gradiometric fluxoniums are a novel type of fluxonium qubits introduced by Gusenkova et al. (Appl. Phys. Lett. 120, 2022). Benefiting from their double-loop geometry, gradiometric fluxoniums are substantially less sensitive to global magnetic fields, while retaining all regular fluxonium properties. Going further, we propose to show the simultaneous locking of a handful of gradiometric fluxoniums at a flux point corresponding to the so-called sweet spot of operation, allowing them to be used without the need for external flux biasing after locking. This is done by trapping a fluxon in the most external loop of each device with an external magnetic field while crossing the metal-to-superconductor transition.

Keywords: quantum information; superconductivity; qubits; fluxonium; granular aluminium