Towards a traveling-wave parametric amplifier with two-octave bandwidth
ORAL
Abstract
In recent years, traveling-wave parametric amplifiers (TWPAs) have become essential for readout of quantum circuits, providing a gain of 15-20 dB over a bandwidth of more than 1 GHz and with near-quantum-limited noise. While TWPAs are widely used in quantum computing, certain applications in other fields, such as radio astronomy, require similar amplifiers but with larger bandwidths extending from e.g. 4 to 12 GHz. Here we present a TWPA based on an array of ~2400 rf-SQUIDs operating in the three-wave-mixing regime, with a 3-dB bandwidth of 3.6 to 8.3 GHz. Our device delivers a gain of 20 dB and exhibits a saturation power of approximately -90 dBm. Employing this TWPA as the first amplifier in our readout chain, we achieve a total system noise of 2-3 photons across the entire bandwidth. Finally, we discuss how to extend the bandwidth towards two octaves and how to improve the flatness of the gain profile.
*This work was supported by the German Federal Ministry of Education and Research (BMBF) within the framework program "Quantum technologies—From basic research to market" (Grant No. 13N15949) and by the European Union under Horizon Europe 2021-2027 Framework Programme, Grant Agreement number 101080152. C.K. gratefully acknowledges the support of the Braunschweig International Graduate School of Metrology B-IGSM and the DFG Research Training Group 1952 Metrology for Complex Nanosystems.
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Presenters
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Victor Gaydamachenko
- Physikalisch-Technische Bundesanstalt