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Traveling-wave Josephson parametric amplifiers (TWJPA): A preliminary study.

Granata V., Mauro C., Barone C., Carapella G., Fasolo L., Enrico E., Pagano S.
  Martedì 13/09   09:00 - 13:30   Aula D - Marianna Ciccone   II - Fisica della materia   Presentazione
The growing interest in quantum technologies, from fundamental physics experiments to quantum computing, demands for extreme performance and quantum-limited electronics. Superconducting microwave amplifiers, due to their dissipationless nature, exhibit outstanding performances in terms of noise (quantum limited), and gain. However, bandwidth and saturation power still show space for substantial improvement. Within the DARTWARS (The DARTWARS Project, funded by Italian Institute of Nuclear Physics (INFN) $\tt https://dartwars.unimib.it/$) Collaboration microwave superconducting amplifiers based on Josephson junction arrays and on distributed kinetic inductance transmission lines have been developed. In this contribution the characterization of the performances of traveling-wave Josephson parametric amplifiers (TWJPA) measured at $T$ = 0.3 ${K}$ is reported. Although in the final experimental setup these amplifiers will operate at a base temperature of about $20 {mK}$, their characterization at $300 {mK}$ aims to evidence the main aspects of their performances. This represents a quick and relatively inexpensive way to test these superconductive devices that can be of help to improve the design and fabrication.