Reflection-enhanced gain in traveling-wave parametric amplifiers
Artikel i vetenskaplig tidskrift, 2023
The operating principle of traveling-wave parametric amplifiers is typically understood in terms of the standard coupled mode theory, which describes the evolution of forward propagating waves without any reflections, i.e., for perfect impedance matching. However, in practice, superconducting microwave amplifiers are unmatched nonlinear finite-length devices, where the reflecting waves undergo complex parametric processes, not described by the standard coupled mode theory. Here, we present an analytical solution for the TWPA gain, which includes the interaction of reflected waves. These reflections result in corrections to the well-known results of the standard coupled mode theory, which are obtained for both three-wave and four-wave mixing processes. Due to these reflections, the gain is enhanced and unwanted nonlinear phase modulations are suppressed. Predictions of the model are experimentally demonstrated on two types of unmatched TWPA, based on coplanar waveguides with a central wire consisting of (i) a high kinetic inductance superconductor, and (ii) an array of 2000 Josephson junctions.
Författare
S. Kern
Univerzita Komenskeho v Bratislave
P. Neilinger
Univerzita Komenskeho v Bratislave
Slovak Academy of Sciences
E. Il'Ichev
Leibniz-Gemeinschaft
A. Sultanov
Aalto-Yliopisto
M. Schmelz
Leibniz-Gemeinschaft
S. Linzen
Leibniz-Gemeinschaft
J. Kunert
Leibniz-Gemeinschaft
G. Oelsner
Leibniz-Gemeinschaft
R. Stolz
Leibniz-Gemeinschaft
Andrey Danilov
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Sumedh Mahashabde
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Aditya Jayaraman
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
V. Antonov
Royal Holloway University of London
Sergey Kubatkin
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
M. Grajcar
Univerzita Komenskeho v Bratislave
Slovak Academy of Sciences
Physical Review B
24699950 (ISSN) 24699969 (eISSN)
Vol. 107 17 174520Mikrovågsförstärkare med kvantbegränsad prestanda
Vetenskapsrådet (VR) (2016-04828), 2017-01-01 -- 2020-12-31.
Wallenberg Centre for Quantum Technology (WACQT)
Knut och Alice Wallenbergs Stiftelse (KAW 2017.0449, KAW2021.0009, KAW2022.0006), 2018-01-01 -- 2030-03-31.
European Microkelvin Platform (EMP)
Europeiska kommissionen (EU) (EC/H2020/824109), 2019-01-01 -- 2022-12-31.
Ämneskategorier (SSIF 2011)
Telekommunikation
Annan fysik
Den kondenserade materiens fysik
DOI
10.1103/PhysRevB.107.174520