In-operando microwave scattering-parameter calibrated measurement of a Josephson travelling wave parametric amplifier

• URL: http://arxiv.org/abs/2406.03063v1
• Date: Wed, 5 Jun 2024 08:46:41 GMT
• Title: In-operando microwave scattering-parameter calibrated measurement of a Josephson travelling wave parametric amplifier
• Authors: S. H. Shin, M. Stanley, W. N. Wong, T. Sweetnam, A. Elarabi, T. Lindström, N. M. Ridler, S. E. de Graaf,
• Abstract summary: Superconducting travelling wave parametric amplifiers (TWPAs) are broadband near-quantum limited microwave amplifiers commonly used for qubit readout. We apply a microwave calibration technique to extract the S- parameters of a Josephson junction based TWPA in-operando.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Superconducting travelling wave parametric amplifiers (TWPAs) are broadband near-quantum limited microwave amplifiers commonly used for qubit readout and a wide range of other applications in quantum technologies. The performance of these amplifiers depends on achieving impedance matching to minimise reflected signals. Here we apply a microwave calibration technique to extract the S-parameters of a Josephson junction based TWPA in-operando. This enables reflections occurring at the TWPA and its extended network of components to be quantified, and we find that the in-operation performance can be well described by the off-state measured S-parameters.

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