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Multilayer microwave integrated quantum circuits for scalable quantum computing
T. Brecht, W. Pfaff, C. Wang, Y. Chu, L. Frunzio, M. H. Devoret, R. J. Schoelkopf
TL;DR
Scaling superconducting quantum circuits requires many components to interact selectively while suppressing crosstalk, preserving coherence, and supporting dense connections. The paper proposes MMIQC, combining integrated-circuit fabrication with long-coherence 3D cQED through multilayer superconducting enclosures, transmission lines, and interconnects. Proof-of-principle resonators demonstrate a high-quality superconducting seam and planar multilayer coupling, while full implementation remains subject to fabrication and coupling challenges.
Problem
Scaling superconducting circuits requires selective, low-loss coupling, high isolation, dense input/output, and reproducible device properties across far more components.
Method
The paper proposes MMIQC, a multilayer platform combining integrated-circuit fabrication with long coherence times from 3D cQED.
Results
A proof-of-principle experiment demonstrated a 3D micromachined resonator with a high-quality superconducting seam and planar multilayer coupling.
Takeaways & Limitations
MMIQC provides a proposed path toward increasingly complex superconducting quantum-information devices using superconducting 3D enclosures and shielded multilayer connections.
Takeaways & Limitations
Some design aspects still require novel techniques, including micromachined superconducting enclosures and coupling between 3D modes and embedded planar circuitry.
Abstract
from arXiv · showhide
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.