Speaker
Description
Recent experimental probes have demonstrated that ambient high-energy radiation can produce phonon-mediated quasiparticle poisoning in superconducting qubit arrays, leading to spatiotemporally correlated errors. This has garnered interest in understanding the potential sensitivity of such arrays to small in-substrate energy depositions characteristic of low-mass, sub-GeV dark matter scatters. In this talk we will discuss a set of simulation tools useful for modeling such energy depositions and the subsequent detector response. Using these tools, we will then present estimates of the efficacy with which superconducting qubit arrays can act as low-threshold phonon-mediated detectors of particle impacts in the attached substrate. In particular, we explore the energy resolution and threshold of qubits operated in an energy relaxation sensing scheme akin to that used in recent studies of radiation-induced correlated errors.
