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TT: Fachverband Tiefe Temperaturen
TT 41: Superconducting Qubits (joint session QI/TT)
TT 41.8: Talk
Wednesday, March 20, 2024, 11:30–11:45, HFT-FT 131
Single-qubit gates on Fluxonium qubits with a sub-harmonic drive — •Johannes Schirk1,2, Florian Wallner1,2, Niklas Bruckmoser1,2, Leon Koch1,2, Ivan Tsitsilin1,2, Niklas Glaser1,2, Vincent Koch1,2, Longxiang Huang1,2, Klaus Liegener1,2, Max Werninghaus1,2, Etienne Denois3, Dominique Sugny3, Christian Schneider1,2, 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 — 3Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS-Université de Bourgogne, Dijon, France
Current implementations of superconducting quantum processors rely on microwave drive lines and flux bias lines to control qubits. To ensure fast and high-fidelity operations, the coupling between the qubit and the control lines must be sufficiently large, which in turn increases energy relaxation of the qubits. In this talk, we present a new approach to control Fluxonium qubits. We experimentally realize high-fidelity single-qubit gates by applying a parametric drive to the qubit’s flux line, eliminating the need for an additional charge line. Moreover, we demonstrate the ability to drive the qubit with a sub-harmonic drive frequency at a fraction of its resonance frequency, using a multi-photon process to excite the qubit. This allows us to place a low-pass filter on the flux line below the qubit’s resonance frequency, thereby suppressing energy relaxation into this single remaining control line.
Keywords: Fluxonium; Qubit Control