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Optimal purification of a spin ensemble by quantum-algorithmic feedback
D. Jackson, Urs Haeusler, Leon Zaporski, J. Bodey, Noah Shofer, E. Clarke, M. Hugues, M. Atatüre, C. Le Gall, D. Gangloff·November 8, 2021·DOI: 10.1103/physrevx.12.031014
Physics
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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.