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A silicon carbide room-temperature single-photon source
RMIT University, Australia .
University of Melbourne, Australia Japan Atom Energy Agency, Japan .
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
University of Melbourne, Australia .
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2014 (English)In: Nature Materials, ISSN 1476-1122, E-ISSN 1476-4660, Vol. 13, no 2, 151-156 p.Article in journal (Refereed) Published
Abstract [en]

Over the past few years, single-photon generation has been realized in numerous systems: single molecules(1), quantum dots(2-4), diamond colour centres5 and others(6). The generation and detection of single photons play a central role in the experimental foundation of quantum mechanics(7) and measurement theory(8). An efficient and high-quality single-photon source is needed to implement quantum key distribution, quantum repeaters and photonic quantum information processing(9). Here we report the identification and formation of ultrabright, room-temperature, photostable single-photon sources in a device-friendly material, silicon carbide (SiC). The source is composed of an intrinsic defect, known as the carbon antisite-vacancy pair, created by carefully optimized electron irradiation and annealing of ultrapure SiC. An extreme brightness (2 x 10(6) counts s(-1)) resulting from polarization rules and a high quantum efficiency is obtained in the bulk without resorting to the use of a cavity or plasmonic structure. This may benefit future integrated quantum photonic devices(9).

Place, publisher, year, edition, pages
Nature Publishing Group , 2014. Vol. 13, no 2, 151-156 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-104643DOI: 10.1038/nmat3806ISI: 000330182700020OAI: diva2:698186
Available from: 2014-02-20 Created: 2014-02-20 Last updated: 2016-10-11
In thesis
1. Development of theoretical approaches for post-silicon information processing
Open this publication in new window or tab >>Development of theoretical approaches for post-silicon information processing
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Despite knowing the fundamental equations in most of the physics research areas, still there is an unceasing need for theoretical method development, thanks to the more and more challenging problems addressed by the research community. The investigation of post-silicon, non-classical information processing is one of the new and rapidly developing areas that requires tremendous amount of theoretical support, new understanding, and accurate theoretical predictions. My thesis focuses on theoretical method development for solid-state quantum information processing, mainly in the field of point defect quantum bits (qubits) in silicon carbide (SiC) and diamond. Due to recent experimental breakthroughs in this field, there are diverse theoretical problems, ranging from functional development for accurate first principles description of point defects, through complete theoretical characterization of qubits, to the modeling and simulation of actual quantum information protocols, that are needed to be addressed. The included articles of this thesis cover the development of (i) hybrid-DFT+Vw approach for the first principles description of mixed correlated and uncorrelated systems, (ii) zero-field-splitting tensor calculation for solid-state quantum bit characterization, (iii) a comprehensive model for dynamic nuclear spin polarization of solid-state qubits in semiconductors, and (iv) group theoretical description of qubits and novel twodimensional materials for topologically protected states.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2016. 74 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1792
National Category
Condensed Matter Physics Other Physics Topics Other Engineering and Technologies not elsewhere specified Computer Science Other Computer and Information Science
urn:nbn:se:liu:diva-131853 (URN)10.3384/diss.diva-131853 (DOI)9789176856826 (Print) (ISBN)
Public defence
2016-11-11, Plank, Fysikhuset, Campus Valla, Linköping, 10:15 (English)
Knut and Alice Wallenberg Foundation
Available from: 2016-10-11 Created: 2016-10-11 Last updated: 2016-10-21Bibliographically approved

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Ivády, Viktor
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