Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Superconducting Electronics: SQUIDs, Qubits, Circuit QED I

TT 38.3: Vortrag

Mittwoch, 19. März 2025, 17:15–17:30, H32

Towards a traveling-wave parametric amplifier with two-octave bandwidth — •Christoph Kissling, Victor Gaydamachenko, and Lukas Grünhaupt — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Traveling-Wave Parametric Amplifiers (TWPAs) are among the leading technologies for amplifying weak microwave signals. They provide a gain of 15-20 dB over a bandwidth of more than 1 GHz while keeping the added noise close to the quantum limit. Although TWPAs are widely used in quantum computing, certain applications in fields like radio astronomy require amplifiers with broader bandwidth, ranging from e.g. 4 to 12 GHz. In this work, we present a TWPA consisting of ca. 2400 rf-SQUIDs, which operates in the three-wave mixing regime and achieves a 3-dB bandwidth of 3.6 to 8.3 GHz. Our device provides a gain of 20 dB and has a saturation power of around -90 dBm. By incorporating this TWPA as the first amplifier in our readout chain, we attain a total system noise of 2-3 photons across the entire bandwidth. Finally, we discuss strategies to extend the bandwidth to two octaves and improve the flatness of the gain profile.

Keywords: Parametric Amplifiers; Microwave Engineering; Qubit Readout; Superconducting Electronics