Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 10: Focus Session: Exploring Quantum Entanglement with Superconducting Qubits and Resonators (joint session QI/TT)
QI 10.4: Talk
Tuesday, March 19, 2024, 10:45–11:00, HFT-FT 131
Parametric coupler architecture for on-demand reset, readout and leakage recovery of superconducting qubits — •Gerhard Huber1,2, Federico Roy2,3, Joao Romeiro1,2, Leon Koch1,2, Niklas Bruckmoser1,2, Niklas Glaser1,2, Ivan Tsitsilin1,2, Max Werninghaus1,2, and Stefan Filipp1,2 — 1Technical University of Munich, Physics Department, 85748 Garching, Germany — 2Walther-Meißner-Institut, 85748 Garching, Germany — 3Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany
When using superconducting qubits thermal excitations of the initial state, leakage into non-computational states during gate operations and unwanted decoherence due to coupling to a readout mode are, however, major sources of errors. Here, we present a superconducting qubit architecture with tunable qubit-resonator coupling. This architecture allows for the efficient preparation of the qubit ground state, the recovery of leakage from higher states and for on-demand qubit readout activated by a single parametric coupler. We experimentally demonstrate a reset operation that unconditionally prepares the qubit ground state with a fidelity of 99.8± 0.02 % and a leakage recovery operation with a 98.5± 0.3 % success probability. Furthermore, we implement a coupler-driven readout with a single-shot assignment fidelity of 88 ± 0.4 %. Completing this set of elementary operations with qubit-qubit gates using the same coupling element, reduces the system complexity and facilitates the implementation of scalable quantum processors.
Keywords: Qubits; Reset; Leakage; Readout; Gates