Long-range coupling and scalable architecture for superconducting flux qubits

Austin G. Fowler, William F. Thompson, Zhizhong Yan, Ashley M. Stephens, B. L.T. Plourde, Frank K. Wilhelm

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


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 by Plourde [Phys. Rev. B 70, 140501(R) (2004)] and extend it to allow approximately 500 MHz coupling of square flux qubits, 50 μm a side, at a distance of up to several millimeters. This mechanism is then used as the basis of two scalable architectures for flux qubits taking into account cross-talk and fault-tolerant considerations such as permitting a universal set of logical gates, parallelism, measurement and initialization, and data mobility.

Original languageEnglish (US)
Article number174507
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
StatePublished - Nov 12 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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