Design of an experimental platform for hybridization of atomic and superconducting quantum systems

Hybrid quantum systems have the potential of mitigating current challenges in developing a scalable quantum computer. Of particular interest is the hybridization between atomic and superconducting qubits. We demonstrate an experimental setup for transferring and trapping ultracold atoms inside a millikelvin cryogenic environment, where interactions between atomic and superconducting qubits may be established, paving the way for hybrid quantum systems. We prepare $^{87}\mathrm{Rb}$ atoms in a conventional magneto-optical trap and transport them via a magnetic conveyor belt into a UHV compatible dilution refrigerator with optical access. We store $5\ifmmode\times\else\texttimes\fi{}{10}^{8}$ atoms with a lifetime of 794 s in the vicinity of the millikelvin stage.