Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity – Poster I

TT 22.16: Poster

Montag, 9. März 2026, 18:00–20:00, P1

Designing a W-band Josephson parametric amplifier. — •Jonas N. Kämmerer¹, Urs Strobel¹, Jakob Lenschen¹, Karapet Hambardzumyan¹, Sergei Masis¹, Jürgen Lisenfeld¹, Hannes Rotzinger^1,2, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut (PHI), Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — ²Institut für QuantenMaterialien und Technologien (IQMT), Karlsruher Institut für Technologie, 76344 Eggenstein-Leopoldshafen, Germany

Superconducting quantum circuits operating in the millimeter-wave regime are expected to offer several advantages that could impact the scalability of future quantum computing systems. These advantages include a reduced footprint, faster qubit manipulation, increased thermal resilience, and higher operating temperatures.

The realization of superconducting qubits in the millimeter-wave regime presents several challenges, one of which is an efficient readout chain. It should include a Josephson parametric amplifier (JPA), which is a nonlinear device that amplifies microwave signals with added noise approaching the quantum limit.

Here, we propose a tunable JPA design operating in the W-band at a frequency of about 100 GHz. Our approach employs a frequency-tunable DC-SQUID made using niobium-based Josephson junction technology. We present numerical simulations conducted to determine the optimal design and operating parameters for three- and four-wave mixing and also address the challenges to overcome in practical devices, such as pumping and coupling schemes.

Keywords: mm-wave; parametric amplifier; circuit QED