M. Rossi, D. Mason, Junxin Chen, Y. Tsaturyan, A. Schliesser
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Quantum Measurement and Control of a Mechanical Resonator
We measure mechanical displacements within 35% of the Heisenberg limit, allowing to both track the quantum trajectory of the highly pure (purity 80%) mechanical state conditioned on this measurement, and ground-state cool via quantum feedback.
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