Persistent Control of a Superconducting Qubit by Stroboscopic Measurement Feedback
Philippe Campagne-Ibarcq, Emmanuel Flurin, Nicolas Roch, David Darson, Pascal Morfin, Mazyar Mirrahimi, Michel Devoret, F. Mallet, Benjamin Huard · Physical Review X · 2013
In sensing-feedback control of a quantum system, optimizing the timing of the sensing measurements turns out to be a key to getting around the fundamental difficulty that a measurement can randomly change the system's state. Achieving optimal timing by combining technical advances with conceptual physical insight, researchers demonstrate, for the first time, high-fidelity control of a superconducting qubit along time-dependent trajectories.