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Feedback control of a solid-state qubit using high-fidelity projective measurement (1207.2944v1)
Published 12 Jul 2012 in cond-mat.mes-hall and quant-ph
Abstract: We demonstrate feedback control of a superconducting transmon qubit using discrete, projective measurement and conditional coherent driving. Feedback realizes a fast and deterministic qubit reset to a target state with 2.4% error averaged over input superposition states, and cooling of the transmon from 16% spurious excitation to 3%. This closed-loop qubit control is necessary for measurement-based protocols such as quantum error correction and teleportation.