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Uncovering many-body correlations in nanoscale nuclear spin baths by central spin decoherence

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  • Wen-Long Ma

    (State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
    The Chinese University of Hong Kong
    Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China)

  • Gary Wolfowicz

    (London Centre for Nanotechnology, University College London
    Oxford University)

  • Nan Zhao

    (Beijing Computational Science Research Center)

  • Shu-Shen Li

    (State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
    Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China)

  • John J.L. Morton

    (London Centre for Nanotechnology, University College London
    University College London)

  • Ren-Bao Liu

    (The Chinese University of Hong Kong
    Center for Quantum Coherence, The Chinese University of Hong Kong
    Institute of Theoretical Physics, The Chinese University of Hong Kong)

Abstract

Central spin decoherence caused by nuclear spin baths is often a critical issue in various quantum computing schemes, and it has also been used for sensing single-nuclear spins. Recent theoretical studies suggest that central spin decoherence can act as a probe of many-body physics in spin baths; however, identification and detection of many-body correlations of nuclear spins in nanoscale systems are highly challenging. Here, taking a phosphorus donor electron spin in a 29Si nuclear spin bath as our model system, we discover both theoretically and experimentally that many-body correlations in nanoscale nuclear spin baths produce identifiable signatures in decoherence of the central spin under multiple-pulse dynamical decoupling control. We demonstrate that under control by an odd or even number of pulses, the central spin decoherence is principally caused by second- or fourth-order nuclear spin correlations, respectively. This study marks an important step toward studying many-body physics using spin qubits.

Suggested Citation

  • Wen-Long Ma & Gary Wolfowicz & Nan Zhao & Shu-Shen Li & John J.L. Morton & Ren-Bao Liu, 2014. "Uncovering many-body correlations in nanoscale nuclear spin baths by central spin decoherence," Nature Communications, Nature, vol. 5(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5822
    DOI: 10.1038/ncomms5822
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