Long-range coupling and scalable architecture for superconducting flux qubits

TL;DR

This paper proposes a long-range coupling mechanism for superconducting flux qubits, enabling scalable quantum architectures with improved error tolerance and practical implementation for large-scale quantum computing.

Contribution

It extends existing flux qubit coupling methods to achieve long-range interactions and designs scalable architectures considering fault-tolerance and crosstalk.

Findings

Achieves approximately 500 MHz coupling at several millimeters distance.

Develops two scalable flux qubit architectures with fault-tolerance features.

Addresses crosstalk, logical gates, measurement, and data mobility in the architectures.

Abstract

Constructing a fault-tolerant quantum computer is a daunting task. Given any design, it is possible to determine the maximum error rate of each type of component that can be tolerated while still permitting arbitrarily large-scale quantum computation. It is an underappreciated fact that including an appropriately designed mechanism enabling long-range qubit coupling or transport substantially increases the maximum tolerable error rates of all components. With this thought in mind, we take the superconducting flux qubit coupling mechanism described in PRB 70, 140501 (2004) and extend it to allow approximately 500 MHz coupling of square flux qubits, 50 um a side, at a distance of up to several mm. This mechanism is then used as the basis of two scalable architectures for flux qubits taking into account crosstalk and fault-tolerant considerations such as permitting a universal set of logical gates, parallelism, measurement and initialization, and data mobility.