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

Author

Listed:
  • Thomas Chalopin

    (Sorbonne Université)

  • Chayma Bouazza

    (Sorbonne Université)

  • Alexandre Evrard

    (Sorbonne Université)

  • Vasiliy Makhalov

    (Sorbonne Université)

  • Davide Dreon

    (Sorbonne Université
    ETH Zurich)

  • Jean Dalibard

    (Sorbonne Université)

  • Leonid A. Sidorenkov

    (Sorbonne Université
    Sorbonne Université)

  • Sylvain Nascimbene

    (Sorbonne Université)

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.

Suggested Citation

  • Thomas Chalopin & Chayma Bouazza & Alexandre Evrard & Vasiliy Makhalov & Davide Dreon & Jean Dalibard & Leonid A. Sidorenkov & Sylvain Nascimbene, 2018. "Quantum-enhanced sensing using non-classical spin states of a highly magnetic atom," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07433-1
    DOI: 10.1038/s41467-018-07433-1
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