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TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity – Poster I

TT 22.10: Poster

Montag, 9. März 2026, 18:00–20:00, P1

Impedance-matched Josephson Parametric Amplifiers — •Amitesh Gupta — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Frequency-multiplexed microwave readout of superconducting qubits is greatly benefited by low-noise and wide-band amplification. Over the past decade, Josephson junction based amplifiers, like the impedance-matched Josephson parametric amplifiers (JPAs), have become one of the solutions, offering quantum-limited noise performance along with bandwidth of a few hundreds of MHz. We present a streamlined way to design a matching network for JPAs using quarter-wave and half-wave transmission lines. It relies on eliminating the complex part of the impedance of the JPA*s dc-SQUID, and matching the input to the negative resistance arising from pumping the JPA. We present harmonic balance simulations of our designs, and show first experimental results of the devices fabricated using Nb-trilayer technology.

Keywords: impedance-matched; parametric amplifier; Nb-trilayer; negative resistance; dc-SQUID