Author:
Haeusler Urs,Jackson Daniel M.,Zaporski Leon,Bodey Jonathan H.,Shofer Noah,Clarke Edmund,Hugues Maxime,Atatüre Mete,Le Gall Claire,Gangloff Dorian A.
Abstract
We present a coherent quantum feedback algorithm to purify a mesoscopic spin ensemble at the ultimate level of a single spin. Applying it to a quantum dot narrowed nuclear-spin fluctuations by two orders of magnitude.