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


    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 under-appreciated 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 Plourde et al. (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 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.

    Original languageEnglish
    Pages (from-to)533-540
    Number of pages8
    JournalCanadian journal of physics
    Issue number4
    Publication statusPublished - Apr 2008


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