Multilayer Microwave Integrated Quantum Circuits: Part 1

Recently, superconducting quantum circuits have advanced from circuits containing few qubits to larger-scale ones with several tens of qubits. In order to increase the computational power of these circuits, many more circuit elements need to be integrated without degrading coherence of the individual components. Although the number of lithographic-precision elements in fully-planar (2D) circuits can be scaled up, it is very challenging to maintain interconnects and suppress decoherence induced by crosstalk as the circuits grow. On the other hand, three dimensional (3D) circuits which use conventionally-machined cavities to engineer the electromagnetic environment offer superior coherence but are challenging to scale up. In this talk, we discuss the multilayer microwave integrated quantum circuit (MMIQC), a platform which combines planar circuits with 3D superconducting enclosures to gain scalability while maintaining coherence.