Quantum-based amplification and multiplexing for the Ricochet Coherent Neutrino Scattering Experiment

Readout of low-intensity microwave signals over a wide bandwidth has become increasingly important for fundamental science. The high frequency allows high information transfer, which is ideal for multiplexing detectors and reducing low-frequency noise.

This work presents the design and calibration of a frequency-multiplexed readout for Ricochet. Ricochet aims to search for new physics in coherent neutrino scattering at ILL in Grenoble using a double cryogenic detector payload: Cryocube and Q-Array. The segmented Q-array concept employs superconducting crystals, transition-edge sensors and RF multiplexing to lower the recoil detection threshold. Furthermore, noise added by further microwave amplification is minimised by using Travelling Wave Parametric Amplifiers (TWPAs), fulfilling the requirements of high dynamic range, high bandwidth and single-photon noise.