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Observation of an anomalous decoherence effect in a quantum bath at room temperature

Author

Listed:
  • Pu Huang

    (University of Science and Technology of China)

  • Xi Kong

    (University of Science and Technology of China)

  • Nan Zhao

    (The Chinese University of Hong Kong, Shatin, New Territories)

  • Fazhan Shi

    (University of Science and Technology of China)

  • Pengfei Wang

    (University of Science and Technology of China)

  • Xing Rong

    (University of Science and Technology of China)

  • Ren-Bao Liu

    (The Chinese University of Hong Kong, Shatin, New Territories)

  • Jiangfeng Du

    (University of Science and Technology of China)

Abstract

The decoherence of quantum objects is a critical issue in quantum science and technology. It is generally believed that stronger noise causes faster decoherence. Strikingly, recent theoretical work suggests that under certain conditions, the opposite is true for spins in quantum baths. Here we report an experimental observation of an anomalous decoherence effect for the electron spin-1 of a nitrogen-vacancy centre in high-purity diamond at room temperature. We demonstrate that, under dynamical decoupling, the double-transition can have longer coherence time than the single-transition even though the former couples to the nuclear spin bath as twice strongly as the latter does. The excellent agreement between the experimental and theoretical results confirms the controllability of the weakly coupled nuclear spins in the bath, which is useful in quantum information processing and quantum metrology.

Suggested Citation

  • Pu Huang & Xi Kong & Nan Zhao & Fazhan Shi & Pengfei Wang & Xing Rong & Ren-Bao Liu & Jiangfeng Du, 2011. "Observation of an anomalous decoherence effect in a quantum bath at room temperature," Nature Communications, Nature, vol. 2(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1579
    DOI: 10.1038/ncomms1579
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    Cited by:

    1. Yu-Xin Wang & Aashish A. Clerk, 2021. "Intrinsic and induced quantum quenches for enhancing qubit-based quantum noise spectroscopy," Nature Communications, Nature, vol. 12(1), pages 1-14, December.
    2. Haonan Wang & Heejun Kim & Duanfei Dong & Keisuke Shinokita & Kenji Watanabe & Takashi Taniguchi & Kazunari Matsuda, 2024. "Quantum coherence and interference of a single moiré exciton in nano-fabricated twisted monolayer semiconductor heterobilayers," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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