Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 4: Poster: Quantum Information

QI 4.39: Poster

Montag, 5. September 2022, 18:00–20:00, P2

High-fidelity gates and readout for scalable multi-qubit superconducting quantum processors — •Florian Wallner1,2, Malay Singh1,2, Gleb Krylov1,2, Ivan Tsitsilin1,2, Gerhard Huber1,2, Niklas Bruckmoser1,2, Leon Koch1,2, Niklas Glaser1,2, Christian Schweizer1,2, and Stefan Filipp1,2,31Physik- Department, Technische Universität München, 85748 Garching, Germany — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, German — 3Munich Center for Quantum Science and Technology (MCQST)

To reach the goal of implementing an error-corrected quantum computer, qubits with long coherence times need to be manipulated in real time with high fidelity, followed by a fast and accurate readout. Currently, the main challenge for all hardware platforms is to scale up the number of qubits while at the same time maintain high quality gate operations.
Here, we report on our recent advances to build superconducting multi-qubit devices. Through a dedicated fabrication process we reach coherence times of up to 150 µs. We show single-qubit characterization measurements of gates and high fidelity dispersive readout. By applying this method to multi-qubit systems, we achieve simultaneous multiplexed readout of several qubits coupled to the same feed line. Furthermore, we demonstrate first randomized benchmarking results for single- and two-qubit gates. In addition we give an outlook on our efforts to build multi-qubit devices and qubits on alternative architectures that promise substantial longer coherence times.

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