G4CMP for Modeling Athermal Phonons in Superconducting Qubit Detectors

Phonon-mediated detectors have emerged as a promising technology for detecting low-energy particles, such as dark matter and neutrinos. Coupling phonons with qubit technology enables the realization of highly sensitive detectors for such particles. We have incorporated phonon and charge transport in G4CMP for several novel materials including Sapphire. Similarly, we have now extended this simulation to model quasiparticle and phonon propagation within Tantalum, Aluminum, and Niobium as well. We present the summary of these simulations on a qubit device and our effort to validate through measurements. Furthermore, we are expanding the capabilities of G4CMP by modeling electron charge propagation in sapphire as well.