Shin, S-H; Stanley, M; Wong, W N; Sweetnam, T; Elarabi, A; Lindstrom, T; Ridler, N M; de Graaf, S (2024) In-operando microwave scattering-parameter calibrated measurement of a Josephson travelling wave parametric amplifier. Applied Physics Letters, 125 (10). 104001

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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

Item Type:	Article
Subjects:	Quantum Phenomena > Quantum Information Processing and Communication
Divisions:	Quantum Technologies
Identification number/DOI:	10.1063/5.0220776
Last Modified:	23 Oct 2024 13:54
URI:	https://eprintspublications.npl.co.uk/id/eprint/10085