Multilayer microwave integrated quantum circuits for scalable quantum computing

Teresa Brecht,Chen Wang,Robert J Schoelkopf,Michel H Devoret,Luigi Frunzio,Yiwen Chu,Wolfgang Pfaff

doi:10.1038/npjqi.2016.2

Abstract

AbstractAs 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 the long coherence times achievable in three-dimensional circuit quantum electrodynamics. This multilayer microwave integrated quantum circuit platform provides a path towards the realisation of increasingly complex superconducting devices in pursuit of a scalable quantum computer.

Highlights

Experimental quantum information processing is rapidly developing in several physical implementations, and superconducting quantum circuits are promising candidates for building a practical quantum computer.[1,2]
Coupling them to resonators forms a powerful platform known as circuit quantum electrodynamics[3,4] that shares several important advantages with classical computing architectures: For one, devices are created in the solid state and their properties can be fully engineered through circuit design and mass produced by lithographic fabrication
As an approach for implementing this concept, we introduce the multilayer microwave integrated quantum circuit (MMIQC), which combines the advantages of integrated circuit fabrication with the long coherence times attainable in 3D circuit quantum electrodynamics (cQED) (Figure 2)

Summary

Introduction

Experimental quantum information processing is rapidly developing in several physical implementations, and superconducting quantum circuits are promising candidates for building a practical quantum computer.[1,2] In these systems, qubits made with Josephson junctions behave like macroscopic atoms with quantised energy levels in the microwave domain. This general hardware architecture is compatible with any complex superconducting circuit, and necessary for the scalable implementation of a device requiring quantum coherence.

Results

Conclusion