Quantum bit with telecom wave-length emission from a simple defect in Si

Autor: Peter Deák, Song Li, Adam Gali
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Communications Physics, Vol 7, Iss 1, Pp 1-6 (2024)
Druh dokumentu: article
ISSN: 2399-3650
87374781
DOI: 10.1038/s42005-024-01834-z
Popis: Abstract Defect-related spin-to-photon interfaces in silicon promise the realization of quantum repeaters by combining advanced semiconductor and photonics technologies. Recently, controlled creation/erasure of simple carbon interstitial defects have been successfully realised in silicon. This defect has a stable structure near room temperature and coherently emits in the wave-length where the signal loss is minimal in optical fibres used in communication technologies. Our in-depth theoretical characterization confirms the assignment of the observed emission to the neutral charge state of this defect, as arising due to the recombination of a bound exciton. We also identified a metastable triplet state that could be applied as a quantum memory. Based on the analysis of the electronic structure of the defect and its similarities to a known optically detected magnetic resonance centre in silicon, we propose that a carbon interstitial can act as a quantum bit and may realize a spin-to-photon interface in complementary metal-oxide semiconductor-compatible platforms.
Databáze: Directory of Open Access Journals
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