Quasiparticle dynamics in superconducting microwave coplanar waveguide resonator arrays at single photon regime

Niobium nitride (NbN) based circuits have recently gained much attention in quantum science and technology due to their high critical temperature and relatively high critical magnetic field. These properties make NbN a promising material candidate, especially for unconventional quantum circuits like hybrid superconductor-semiconductor quantum circuits, kinetic inductance detectors, and single electron transistors. The presence of charge carriers that don't participate in the superconducting condensate, known as quasiparticle poisoning, is one of the primary reasons limiting the performance of superconducting microwave quantum circuits. Moreover, recent studies indicate that in multi-qubit systems, quasiparticle emergence can lead to suppression in the qubit relaxation time since quasiparticles are coupled with all qubits in a wafer scale chip. This experiment aims to investigate, through both theoretical and experimental approaches, the effect of quasiparticle energy on the performance of NbN superconducting microwave coplanar waveguide resonators on different material platforms at single photon regime for the development of coherent hybrid superconducting quantum circuits.