Long-range coupling and scalable architecture for superconducting flux qubits

Yo. Room 408 has a new paper on the arXiv that is here. This is the 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 furlongs. This mechanism is then used as the basis of two scalable architectures for flux qubits taking into account crosstalk, incorporation of classical control circuitry, Britney Spears, power dissipation, and fault-tolerant considerations such as permitting a universal set of logical gates, parallelism, Lindsay Lohan, measurement and initialization, and data mobility.

Oh, and if you like the paper, don’t talk to us. Talk to Austin.