Granular Aluminum Parametric Amplifier for Low-Noise Measurements in Tesla Fields

• DOI: 10.48550/arxiv.2403.10669
• Publication Date: 2024-03-15
• Authors: Nicolas Zapata; Ivan Takmakov; Simon Günzler; Ameya Nambisan; D. J. Rieger; T. Reisinger; Wolfgang Wernsdorfer; Ioan M. Pop
• Keywords: Parametric oscillator

Josephson junction parametric amplifiers have become essential tools for microwave quantum circuit readout with minimal added noise. Even after improving at an impressive rate in the last decade, they remain vulnerable to magnetic fields, which limits their use many applications such as spin qubits, Andreev and molecular magnet devices, dark matter searches, etc. Kinetic inductance materials, granular aluminum (grAl), offer alternative source of non-linearity innate resilience in-plane fields. We present a non-degenerate amplifier made two coupled grAl resonators resilient field up 1 T. It operates close limit 20 dB amplification, 28 MHz gain-bandwidth product -110 dBm saturation power.