Dresden 2026 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

QI: Fachverband Quanteninformation

QI 11: Implementations IV

QI 11.8: Talk

Wednesday, March 11, 2026, 12:00–12:15, BEY/0245

Magnetic-Field and Temperature Limits of a Kinetic-Inductance Traveling-Wave Parametric Amplifier — Lucas M. Janssen¹, Farzad Faramarzi², Henry G. LeDuc², Sahil Patel^3,2, Gianluigi Catelani^4,5, Peter K. Day², Yoichi Ando¹, and •Dickel Christian¹ — ¹Physics Institute II, University of Cologne, Germany — ²Jet Propulsion Laboratory, Caltech, USA — ³Department of Applied Physics and Materials Science, Caltech, USA — ⁴JARA Institute for Quantum Information (PGI-11), Forschungszentrum Jülich, Germany — ⁵Quantum Research Center, TII, Abu Dhabi, UAE

Kinetic-inductance traveling-wave parametric amplifiers (KI-TWPAs) offer broadband near-quantum-limited amplification with high saturation power. In this work [1], we study how magnetic field and temperature affect the performance of a KI-TWPA based on a thin-NbTiN inverse microstrip with a Nb ground plane. This KI-TWPA can provide substantial signal-to-noise ratio improvement (ΔSNR) up to in-plane magnetic fields of 0.35 T and out-of-plane fields of 50 mT, considerably higher than what has been demonstrated with TWPAs based on Josephson junctions [2]. We also find that the gain does not degrade when the temperature is raised to 3 K (limited by the Nb ground plane) while ΔSNR decreases with temperature consistently with expectation. The operability of KI-TWPAs in high magnetic fields opens the door to a wide range of applications in spin qubits, spin ensembles, topological qubits, low-power NMR, and the search for axion dark matter. [1] Janssen et al., PR Appl. 2024 [2] Janssen et al., arXiv:2509.15043

Keywords: TWPA; kinetic inductance; quantum-limited amplifier; parametric amplifier