K band Josephson traveling wave parametric amplifiers for neutrino mass measurement*

Josephson traveling wave parametric amplifier (JTWPAs) are high-gain, broadband, and low-noise quantum amplifiers that are crucial for frequency-multiplexed superconducting qubit readout. They also hold great promise in advancing quantum sensing capabilities across many fields. In collaboration with Project 8, a next-generation neutrino mass experiment which measures the electron cyclotron frequency from tritium beta decay to infer the neutrino mass, we are developing high-frequency JTWPAs centered at 25 GHz. These JTPWAs are predicted to attain 20 dB of gain over a few GHz of bandwidth with approximately 85% quantum efficiency relative to an ideal phase-preserving amplifier, resulting in an order of magnitude better noise performance than that of off-the-shelf HEMT amplifiers. This talk presents simulations of the frequency response and parasitics of high-frequency JTWPA chip designs, as well as how to optimize packaging to minimize extraneous modes and impedance mismatches. We also present experimental progress towards utilizing the JTWPA in the Project 8 measurement chain to detect electromagnetic signals below the femtowatt level, and highlight that the high frequency JTWPA bandwidth can be tailored to address a wide range of applications, such as quantum information processing, dark matter searches, and other fundamental physics demonstrations.