SAMOP 2023 – scientific programme
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QI: Fachverband Quanteninformation
QI 5: Superconducting Qubits and Hybrid Systems
QI 5.2: Talk
Monday, March 6, 2023, 11:30–11:45, F428
Towards High-Fidelity Fluxonium Quantum Processors — •Florian Wallner1,2, Johannes Schirk1,2, Ivan Tsitsilin1,2, Christian Schneider1,2, Niklas Bruckmoser1,2, Leon Koch1,2, and Stefan Filipp1,2 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, Garching, Germany — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany
To solve real-world problems on error-corrected quantum computers it is estimated that multiple hundreds to thousands of physical qubits have to be combined to build one logical qubit. This results in an impractical large overhead in the number of qubits and demands new types of qubits with orders of magnitude improvements in performance.
Here, we report on our recent advances to build superconducting fluxonium qubits that offer distinct advantages compared to the wide-spread transmons-type qubits. We show high coherence times and fast high-fidelity single qubit gates, realized through the flux bias line, which significantly reduces the control line overhead associated with flux qubits. Furthermore, we demonstrate a dispersive readout with assignment fidelity greater than 96%. Since these qubits have low transition frequencies a significant thermal population needs to be removed at the start of each experiment. We achieve this by employing an unconditional active reset and a conditional real-time feedback-assisted reset that can later enable dynamical circuits. In addition, we provide an outlook on our efforts to build multi-qubit devices and multi-qubit gates.