Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Superconducting Electronics: SQUIDs, Qubits, Circuit QED III
TT 55.5: Vortrag
Freitag, 21. März 2025, 10:30–10:45, H36
Optically mediated control for superconducting qubits — •Kevin Kiener1,2, Gleb Krylov1,2, Florian Wallner1,2, Max Werninghaus1,2, Nadeem Akhlaq2,3, Frederik Pfeiffer1,2, Johannes Schirk1,2, and Stefan Filipp1,2 — 1Walther-Meißner-Instiut, Bayerische Akademie der Wissenschaften — 2Technical University of Munich, TUM School of Natural Sciences, Department of Physics — 3Walter Schottky Institut
In superconducting quantum computers, scaling control and readout wiring infrastructure presents significant challenges. Optical fibers offer a promising alternative to microwave cables by providing lower passive heat load, reduced footprint per channel, reduced crosstalk and the potential for multiplexing control channels. Here, we explore the conversion of microwave- to optical signals via amplitude modulation and the subsequent reconversion to microwave signals at millikelvin (mK) temperatures. Two fiber coupling strategies are experimentally evaluated in a cryogenic environment, focusing on their practicality for qubit control. We theoretically investigate methods to reduce the power dissipation of the photodiode at mK temperatures, focusing on two approaches: utilizing an impedance converter and employing high-impedance transmission lines. We investigate the validity of the signal generation for different frequencies and identify suitable frequency ranges to control different qubit architectures and coupling elements.
We acknowledge financial support from GeQCoS, MUNIQC-SC, MCQST, OpenSuperQPlus100, the Munich Quantum Valley and the Deutsche Forschungsgemeinschaft.
Keywords: Qubit Control; Photodiode; Superconducting Qubits; Optical Fiber