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A small footprint travelling-wave parametric amplifier with a high Signal-to-Noise Ratio improvement in a wide band

ORAL

Abstract

We fabricate and characterise a travelling-wave parametric amplifier (TWPA). It implements three-wave mixing (3WM) by using magnetically flux-biased superconducting nonlinear asymmetric inductive elements (SNAILs). Phase matching is achieved by means of resonant phase matching (RPM) with lumped-element oscillators, up-conversion phase mismatching by using a small cutoff frequency and impedance matching by adding impedance matching networks at the input and output ports. The device has a physical footprint of only 1.1 mm2 and only 200 unitcells, yet demonstrates an average parametric gain of 19 dB over a 3 GHz bandwidth, an average effective signal-to-noise ratio improvement of 10 dB and a clear speedup of qubit readout time.

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Publication: Article 1:<br>H. Renberg Nilsson, A. Fadavi Roudsari, D. Shiri, P. Delsing, and V. Shumeiko,<br>High-Gain Traveling-Wave Parametric Amplifier Based on Three-Wave Mixing,<br>Phys. Rev. Appl., 19, 044056 (2023).<br><br>Article 2:<br>H. Renberg Nilsson, D. Shiri, R. Rehammar, A. Fadavi Roudsari and P. Delsing,<br>Peripheral circuits for ideal performance of a traveling-wave parametric amplifier,<br>Phys. Rev. Appl. 21, 064062 (2024).<br><br>Article 3:<br>H. Renberg Nilsson, L. Chen, G. Tancredi, R. Rehammar, D. Shiri, F. Nilsson, A. Osman, V. Shumeiko and P. Delsing, <br>A small footprint travelling-wave parametric amplifier with a high Signal-to-Noise Ratio improvement in a wide band,<br>arXiv:2408.16366

Presenters

  • Hampus Renberg Renberg Nilsson

    Chalmers Univ of Tech

Authors

  • Hampus Renberg Renberg Nilsson

    Chalmers Univ of Tech