Accurate Qubit Control with Single Flux Quantum Pulses

A longstanding goal of quantum-computer architecture is to integrate control circuitry in a fault-tolerant and compact manner that will facilitate future scalable designs. In this paper, authors propose using resonant trains of single flux quantum pulses to produce fidelities in excess of 99.9% for 20-ns gate times. The pulses provide one sharp kick per qubit oscillation period, analogous to pumping up a rider on a swing by giving one short push per cycle.