High Frequency Floquet Traveling Wave Parametric Amplifiers above 12 GHz

Quantum-limited microwave amplification above 12 GHz enables new capabilities in quantum information processing, neutrino mass measurement, and dark matter searches. In superconducting qubit systems, higher operating frequencies suppress thermal photon occupation, permit higher-temperature operation, reduce circuit size, and provide additional spectral headroom for multiplexed readout in large-scale quantum processors. Likewise, particle physics experiments targeting weak radio-frequency signatures benefit from amplifiers offering high gain, low noise, and broad instantaneous bandwidth. However, operating above 12 GHz introduces impedance matching constraints, increased attenuation, and greater loss within cables and packaging. Below 12 GHz, Floquet Josephson traveling-wave parametric amplifiers (JTWPAs) using coplanar, high-Q capacitors fabricated in an Al process have achieved near-quantum-limited noise with low insertion loss. Here we demonstrate a high-frequency Floquet JTWPA that delivers 20 dB of gain over a bandwidth of 2 GHz, with insertion loss below 1 dB up to 17 GHz. Our package design maintains impedance matching and minimal reflection through 25 GHz while remaining compatible with standard cryogenic measurement chains. This device enables direct readout of high-frequency superconducting qubits and supports the development of quantum-limited detectors for neutrino and axion experiments, establishing a pathway toward scalable, higher-temperature, and broadband quantum microwave instrumentation.