Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.51: Poster
Monday, March 18, 2024, 15:00–18:00, Poster C
Comparative Analysis of Aluminium- and Niobium-based Josephson Parametric Amplifiers — •Felix Henrich1, Alexander Stoll1, Federica Mantegazzini2, Felix Ahrens2, Claudio Gatti3, Andreas Fleischmann1, Loredana Gastaldo1, and Christian Enss1 — 1Kirchhoff-Institute of Physics, Heidelberg University, Germany — 2Fondazione Bruno Kessler, Trento, Italy — 3Laboratori Nazionali di Frascati, Frascati, Italy
Josephson Parametric Amplifiers (JPAs) are devices used to amplify ultralow-power microwave signals. Their capability to operate at or even surpass the Standard Quantum Limit (SQL) with high gain enables unprecedented possibilities in quantum information processing and detector readout.
We present the characterization of flux-driven JPA designs consisting of a Superconducting QUantum Interference Device (SQUID), based on crosstype Josephson tunnel Junctions (JJs), combined with a superconducting coplanar waveguide resonator. The JPAs were fabricated using either Nb or Al as the superconductor. The aluminium versions feature a Al\Al2O3\Al tri-layer, while the niobium counterparts employ a Nb\Al\Al2O3\Nb tri-layer, facilitated by the planarization of the tri-layer in sputtered SiO2 to avoid electrical shorts at the side wall of the JJs.
We compare the key parameters obtained from the Nb-based JPAs and Al-based JPAs and discuss our observations.