Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Superconducting Electronics: SQUIDs, Qubits, Circuit QED I
TT 38.4: Vortrag
Mittwoch, 19. März 2025, 17:30–17:45, H32
Mitigating phase velocity mismatch in flux-pumped Josephson traveling wave parametric amplifiers — •Daniil Bazulin1,2, Lars Aaron Anhalt1,2, Kevin Kiener1,2, Matthias Grammer1,2, Niklas Bruckmoser1,2, Leon Koch1,2, Matthias Althammer1,2, Stephan Geprägs1,2, Stefan Filipp1,2,3, and Kirill G. Fedorov1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
Josephson traveling wave parametric amplifiers (JTWPAs) play a key role in enabling fast readout of multiple qubits in scalable superconducting quantum processors. These amplifiers utilize wave-mixing processes in extended nonlinear media, to achieve broadband amplification with noise performance close to the standard quantum limit. Flux-pumped JTWPAs, employing the SNAIL-based nonlinear media, are particularly interesting due to their potential to eliminate the problem of pump depletion and mitigate upconversion losses. However, these devices exhibit a phase velocity mismatch between pump and signal modes, which suppresses a maximum achievable amplification gain. This issue can be addressed by using materials with high dielectric constant or kinetic inductance, like SrTiO3 and NbTiN, respectively. Here, we present our progress in millikelvin characterization of these materials and their prospects in the flux-pumped JTWPAs.
Keywords: JTWPA; SNAIL; Flux-pumping; Phase velocity