TY  - JOUR
A1  - Fuchs, F.
A1  - Stender, B.
A1  - Trupke, M.
A1  - Simin, D.
A1  - Pflaum, J.
A1  - Dyakonov, V.
A1  - Astakhov, G.V.
T1  - Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide
JF  - Nature Communications
N2  - Vacancy-related centres in silicon carbide are attracting growing attention because of their appealing optical and spin properties. These atomic-scale defects can be created using electron or neutron irradiation; however, their precise engineering has not been demonstrated yet. Here, silicon vacancies are generated in a nuclear reactor and their density is controlled over eight orders of magnitude within an accuracy down to a single vacancy level. An isolated silicon vacancy serves as a near-infrared photostable single-photon emitter, operating even at room temperature. The vacancy spins can be manipulated using an optically detected magnetic resonance technique, and we determine the transition rates and absorption cross-section, describing the intensity-dependent photophysics of these emitters. The on-demand engineering of optically active spins in technologically friendly materials is a crucial step toward implementation of both maser amplifiers, requiring high-density spin ensembles, and qubits based on single spins.
KW  - nuclear magnetic resonance
KW  - coherent control
KW  - 4H
KW  - phosphorus
KW  - qubits
KW  - defects
KW  - entanglement
KW  - room temperature
KW  - vacancy
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-148502
VL  - 6
IS  - 7578
ER  - 
TY  - JOUR
A1  - Harrison, Odile B.
A1  - Claus, Heike
A1  - Jiang, Ying
A1  - Bennett, Julia S.
A1  - Bratcher, Holly B.
A1  - Jolley, Keith A.
A1  - Corton, Craig
A1  - Care, Rory
A1  - Poolman, Jan T.
A1  - Zollinger, Wendell D.
A1  - Frasch, Carl E.
A1  - Stephens, David S.
A1  - Feavers, Ian
A1  - Frosch, Matthias
A1  - Parkhill, Julian
A1  - Vogel, Ulrich
A1  - Quail, Michael A.
A1  - Bentley, Stephen D.
A1  - Maiden, Martin C. J.
T1  - Description and Nomenclature of Neisseria meningitidis Capsule Locus
JF  - Emerging Infectious Diseases
N2  - Pathogenic Neisseria meningitidis isolates contain a polysaccharide capsule that is the main virulence determinant for this bacterium. Thirteen capsular polysaccharides have been described, and nuclear magnetic resonance spectroscopy has enabled determination of the structure of capsular polysaccharides responsible for serogroup specificity. Molecular mechanisms involved in N. meningitidis capsule biosynthesis have also been identified, and genes involved in this process and in cell surface translocation are clustered at a single chromosomal locus termed cps. The use of multiple names for some of the genes involved in capsule synthesis, combined with the need for rapid diagnosis of serogroups commonly associated with invasive meningococcal disease, prompted a requirement for a consistent approach to the nomenclature of capsule genes. In this report, a comprehensive description of all N. meningitidis serogroups is provided, along with a proposed nomenclature, which was presented at the 2012 XVIIIth International Pathogenic Neisseria Conference.
KW  - genetics
KW  - nuclear magnetic resonance
KW  - structural determination
KW  - meningococcal polysaccharides
KW  - chemical properties
KW  - serogroup-Y
KW  - group-B
KW  - antigen
KW  - biosynthesis
KW  - elucidation
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-131703
VL  - 19
IS  - 4
ER  -