Vantablack Shielding of Superconducting Qubit Systems

Circuit quantum electrodynamics (cQED) experiments on superconducting qubit systems typically employ radiation shields coated in photon absorbing materials to achieve high coherence and low microwave resonator losses. In this work, we present preliminary results the performance of Vantablack as a novel infrared (IR) shielding material for cQED systems. We compare properties residual excited state population (or effective temperature) single-junction transmon housed shield with standard epoxy-based IR material, i.e. Berkeley Black, temperature same Vantablack. Based statistical analysis multiple measurements find that is comparable coating. However, has higher temperature. These indicate improvements are likely required optimize an discuss possible routes such improvements. Finally describe future more precisely quantify improve coherences complex