Carbon defect qubit in two-dimensional WS2

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Li, SongWigner Res Ctr Phys, Hungary (author)

Carbon defect qubit in two-dimensional WS2

Article/chapterEnglish2022

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2022-03-08
Nature Portfolio,2022
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LIBRIS-ID:oai:DiVA.org:liu-183876
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-183876URI
https://doi.org/10.1038/s41467-022-28876-7DOI

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Language:English
Summary in:English

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Funding Agencies|Hungarian NKFIHNational Research, Development & Innovation Office (NRDIO) - Hungary [KKP129866]; Quantum Information National Laboratory from Ministry of Innovation and Technology of Hungary; EU H2020 Quantum Technology Flagship project ASTERIQS [820394]
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. Recent work has demonstrated controlled fabrication of single carbon defect spins in the two-dimensional material WS2. Here, the authors use ab initio methods to determine the electronic and optical properties of this defect, establishing it as a viable qubit candidate operating close to the telecom band.

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NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng

Added entries (persons, corporate bodies, meetings, titles ...)

Thiering, GergoWigner Res Ctr Phys, Hungary (author)
Udvarhelyi, PeterWigner Res Ctr Phys, Hungary (author)
Ivády, Viktor,1986-Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten,Wigner Res Ctr Phys, Hungary; Max Planck Inst Phys Komplexer Syst, Germany(Swepub:liu)vikiv58 (author)
Gali, AdamWigner Res Ctr Phys, Hungary; Budapest Univ Technol & Econ, Hungary (author)
Wigner Res Ctr Phys, HungaryTeoretisk Fysik (creator_code:org_t)

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In:Nature Communications: Nature Portfolio13:12041-1723

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By the author/editor: Li, Song; Thiering, Gergo; Udvarhelyi, Pete ...; Ivády, Viktor, 1 ...; Gali, Adam

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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By the university: Linköping University

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