Quantum-enhanced sensing using non-classical spin states of a highly magnetic atom

Thomas Chalopin, Chayma Bouazza, Alexandre Evrard, Vasiliy Makhalov, Davide Dreon, Jean Dalibard, Leonid A. Sidorenkov () and Sylvain Nascimbene
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Thomas Chalopin: Sorbonne Université
Chayma Bouazza: Sorbonne Université
Alexandre Evrard: Sorbonne Université
Vasiliy Makhalov: Sorbonne Université
Davide Dreon: Sorbonne Université
Jean Dalibard: Sorbonne Université
Leonid A. Sidorenkov: Sorbonne Université
Sylvain Nascimbene: Sorbonne Université

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Coherent superposition states of a mesoscopic quantum object play a major role in our understanding of the quantum to classical boundary, as well as in quantum-enhanced metrology and computing. However, their practical realization and manipulation remains challenging, requiring a high degree of control of the system and its coupling to the environment. Here, we use dysprosium atoms—the most magnetic element in its ground state—to realize coherent superpositions between electronic spin states of opposite orientation, with a mesoscopic spin size J = 8. We drive coherent spin states to quantum superpositions using non-linear light-spin interactions, observing a series of collapses and revivals of quantum coherence. These states feature highly non-classical behavior, with a sensitivity to magnetic fields enhanced by a factor 13.9(1.1) compared to coherent spin states—close to the Heisenberg limit 2J = 16—and an intrinsic fragility to environmental noise.

Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07433-1

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DOI: 10.1038/s41467-018-07433-1

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