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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 Filipp1,21Technical 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

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