Optimising the design of a broadband Josephson junction TWPA for axion dark matter search experiments

Javier M. Navarro; Boon-Kok Tan

doi:10.1117/12.2601382

6 October 2021 Optimising the design of a broadband Josephson junction TWPA for axion dark matter search experiments

Javier M. Navarro, Boon-Kok Tan

Proceedings Volume 11881, Quantum Technology: Driving Commercialisation of an Enabling Science II; 1188115 (2021) https://doi.org/10.1117/12.2601382
Event: SPIE Photonex, 2021, Glasgow, United Kingdom

Conference Poster

Abstract

Broadband ultra-low noise amplification is important for many fundamental physics experiments. In our case, we aim to develop a quantum limited Josephson Travelling Wave Parametric Amplifier (JTWPA) for dark matter search experiments. In this paper, we focus on the development of the JTWPA, in particular to optimise the performance of the amplifier with a simplified fabrication prospect. We present our methodology for the optimisation process, focusing on three important aspects, namely utilising the minimal number of tunnel junction required, maximising the operational bandwidth and achieving a 50 Ω characteristic impedance. We first explore the relations between the important circuit parameters of the JTWPA and its performance indicators. Using the information obtained, we perform our optimisation process to search for the optimal design parameters. We then compare the gain bandwidth performance of the different optimised models, and present our findings with further analyses. We demonstrate that our optimised model requires 4 less tunnel junctions compared to the conventional model, and we are able to improve the operational bandwidth by 68% while maintaining the characteristic impedance of the device at 50 Ω.

Citation Download Citation

Javier M. Navarro and Boon-Kok Tan "Optimising the design of a broadband Josephson junction TWPA for axion dark matter search experiments", Proc. SPIE 11881, Quantum Technology: Driving Commercialisation of an Enabling Science II, 1188115 (6 October 2021); https://doi.org/10.1117/12.2601382

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