  As experimental quantum information processing (QIP) rapidly advances, an
emerging challenge is to design a scalable architecture that combines various
quantum elements into a complex device without compromising their performance.
In particular, superconducting quantum circuits have successfully demonstrated
many of the requirements for quantum computing, including coherence levels that
approach the thresholds for scaling. However, it remains challenging to couple
a large number of circuit components through controllable channels while
suppressing any other interactions. We propose a hardware platform intended to
address these challenges, which combines the advantages of integrated circuit
fabrication and long coherence times achievable in three-dimensional circuit
quantum electrodynamics (3D cQED). This multilayer microwave integrated quantum
circuit (MMIQC) platform provides a path toward the realization of increasingly
complex superconducting devices in pursuit of a scalable quantum computer.
