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State preparation of a fluxonium qubit with feedback from a custom FPGA-based platform

Gebauer, Richard; Karcher, Nick; Gusenkova, Daria; Spiecker, Martin; Grünhaupt, Lukas; Takmakov, Ivan; Winkel, Patrick; Planat, Luca; Roch, Nicolas; Wernsdorfer, Wolfgang; Ustinov, Alexey V.; Weber, Marc; Weides, Martin; Pop, Ioan M.; Sander, Oliver

Abstract (englisch):
We developed a versatile integrated control and readout instrument for experiments with superconducting quantum bits (qubits), based on a field-programmable gate array (FPGA) platform. Using this platform, we perform measurement-based, closed-loop feedback operations with 428 ns platform latency. The feedback capability is instrumental in realizing active reset initialization of the qubit into the ground state in a time much shorter than its energy relaxation time T1. We show experimental results demonstrating reset of a fluxonium qubit with 99.4 % fidelity, using a readout-and-drive pulse sequence approximately 1.5 µs long. Compared to passive ground state initialization through thermalization, with the time constant given by T1 = 80 µs, the use of the FPGA-based platform allows us to improve both the fidelity and the time of the qubit initialization by an order of magnitude.

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DOI: 10.1063/5.0011721
Zitationen: 3
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Physikalisches Institut (PHI)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0094-243X
KITopen-ID: 1000120881
HGF-Programm 43.21.02 (POF III, LK 01) Quantum Properties of Nanostructures
Erschienen in 5th International Conference on Quantum Technologies (ICQT 2019)
Veranstaltung 5th International Conference on Quantum Technologies (ICQT 2019), Moskau, Russland, 15.07.2019 – 19.07.2019
Verlag American Institute of Physics (AIP)
Seiten Article no: 020015
Serie AIP Conference Proceedings ; 2241
Vorab online veröffentlicht am 23.06.2020
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