Conférence : « Synthèse et intégration de défauts de spin adressables optiquement dans le diamant et dans le carbure de silicium pour des applications dans les technologies de l’information quantique »

Professeur qui invite : My Ali El Khakani

Résumé :  

Optically addressable point-defects in wide band-gap semiconductors offer a versatile platform for quantum information science. However, the coherence, charge stability, and optical transition frequency of these qubits are sensitive to their local crystalline, charge, and nuclear environments, which limit their scalability for nanoscale sensing and quantum communication. Recent advances in host growth, nanofabrication, and defect synthesis have enabled the engineering of these environments via the control of crystal structure, isotopic purity, and host dimensionality. Additionally, recent advances in synthesizing low-dimensionality defect hosts for deterministic hetero-integration with other classical or quantum systems will be presented, including the synthesis of a diamond membrane materials platform. This talk will focus on the synthesis of these defect systems through isotopically controlled synthesis of host materials and the localization of various defect systems in silicon carbide and diamond as well as novel fundamental explorations these advances are enabling. Advanced, synchrotron-based characterization techniques will be discussed as a direct means of better understanding the local crystal environment surrounding the defects and providing a pathway for improving defect-based quantum technologies. Finally, a brief outlook of this work going forward will be provided.

Biographie :

Dr. Nazar Delegan is a Staff Scientist in the Quantum Metamaterials Group within the Materials Science Division at Argonne National Laboratory. He is also affiliated with both Q-NEXT—one of the U.S. Department of Energy’s five National Quantum Information Science Research Centers—and the University of Chicago. His current research focuses on the deterministic synthesis of materials for quantum information science, along with the fundamental studies that such control enables. He earned his Ph.D. in 2019 from the Institut National de la Recherche Scientifique – Énergie, Matériaux et Télécommunications (INRS-EMT), under the supervision of Prof. El Khakani. His doctoral research focused on the controlled doping and defect engineering of titanium oxide based semiconductor materials for electro-photocatalytic applications. He has already contributed more than 50 articles in impactful scientific journals.

*Le séminaire sera présenté en anglais. La discussion peut avoir lieu dans les deux langues.