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QI: Fachverband Quanteninformation
QI 19: Superconducting Electronics: Qubits I (joint session TT/QI)
QI 19.11: Vortrag
Mittwoch, 20. März 2024, 17:30–17:45, H 0104
rf-SQUID-based three-wave-mixing traveling-wave parametric amplifier — •Victor Gaydamachenko, Christoph Kissling, Marat Khabipov, Fabian Kaap, Sergey Lotkhov, Ralf Dolata, Alexander B. Zorin, and Lukas Grünhaupt — Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
Traveling-wave parametric amplifiers (TWPAs) are one of the most promising devices for the improvement of the readout efficiency of fW-range microwave signals at a bandwidth of several GHz. By adding only a minimal amount of noise close to the absolute limit allowed by quantum mechanics, quantum technologies and other applications benefit from their usage. We realize a TWPA based on an array of 2000 rf-SQUIDs with phase-matching achieved by periodic capacitance loading, which we optimized by time-domain circuit simulations. Our TWPA is fabricated using Nb/Al-AlOx/Nb trilayer technology. In the three-wave mixing regime the device provides an average gain of 18 dB between 3 and 7 GHz and exhibits a saturation power of approximately -90 dBm. Here, we present the design and experimental results including noise characterization of the device.
Keywords: Parametric amplifier; rf-SQUID; readout efficiency; niobium