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Carbon defect qubit in two-dimensional WS2

Author

Listed:
  • Song Li

    (Wigner Research Centre for Physics)

  • Gergő Thiering

    (Wigner Research Centre for Physics)

  • Péter Udvarhelyi

    (Wigner Research Centre for Physics)

  • Viktor Ivády

    (Wigner Research Centre for Physics
    Chemistry and Biology, Linköping University
    Max Planck Institute for the Physics of Complex Systems)

  • Adam Gali

    (Wigner Research Centre for Physics
    Institute of Physics, Budapest University of Technology and Economics)

Abstract

Identifying and fabricating defect qubits in two-dimensional semiconductors are of great interest in exploring candidates for quantum information and sensing applications. A milestone has been recently achieved by demonstrating that single defect, a carbon atom substituting sulphur atom in single layer tungsten disulphide, can be engineered on demand at atomic size level precision, which holds a promise for a scalable and addressable unit. It is an immediate quest to reveal its potential as a qubit. To this end, we determine its electronic structure and optical properties from first principles. We identify the fingerprint of the neutral charge state of the defect in the scanning tunnelling spectrum. In the neutral defect, the giant spin-orbit coupling mixes the singlet and triplet excited states with resulting in phosphorescence at the telecom band that can be used to read out the spin state, and coherent driving with microwave excitation is also viable. Our results establish a scalable qubit in a two-dimensional material with spin-photon interface at the telecom wavelength region.

Suggested Citation

  • Song Li & Gergő Thiering & Péter Udvarhelyi & Viktor Ivády & Adam Gali, 2022. "Carbon defect qubit in two-dimensional WS2," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28876-7
    DOI: 10.1038/s41467-022-28876-7
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    2. Amrita Goldar & Diya Dasgupta, 2023. "Beyond the Stocktake (Part II): Clean Energy Technologies," Indian Council for Research on International Economic Relations (ICRIER) Policy Paper 14, Indian Council for Research on International Economic Relations (ICRIER), New Delhi, India.
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    4. Kumar, Tharun Roshan & Beiron, Johanna & Biermann, Maximilian & Harvey, Simon & Thunman, Henrik, 2023. "Plant and system-level performance of combined heat and power plants equipped with different carbon capture technologies," Applied Energy, Elsevier, vol. 338(C).
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