  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 a novel
experimental setup for transferring and trapping ultracold atoms inside a
millikelvin cryogenic environment, where interactions between atomic and
superconducting qubits can be established, paving the way for hybrid quantum
systems. $^{87}\text{Rb}$ atoms are prepared in a conventional magneto-optical
trap and transported via a magnetic conveyor belt into a UHV compatible
dilution refrigerator with optical access. We store $5\times10^{8}$ atoms with
a lifetime of 794 seconds in the vicinity of the millikelvin stage.
