Disentangling the exchange coupling of entangled donors in the Si quantum computer architecture

We develop a theory for micro-Raman scattering by single and coupled two-donor states in silicon. We find the Raman spectra to have significant dependence on the donor exchange splitting and the relative spatial positions of the two-donor sites. In particular, we establish a strong correlation betwe...

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Bibliographic Details
Published in:Physical review letters 2003-02, Vol.90 (6), p.067401-067401, Article 067401
Main Authors: Koiller, Belita, Hu, Xuedong, Drew, H D, Sarma, S Das
Format: Article
Language:English
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Summary:We develop a theory for micro-Raman scattering by single and coupled two-donor states in silicon. We find the Raman spectra to have significant dependence on the donor exchange splitting and the relative spatial positions of the two-donor sites. In particular, we establish a strong correlation between the temperature dependence of the Raman peak intensity and the interdonor exchange coupling. Micro-Raman scattering can therefore potentially become a powerful tool to measure interqubit coupling in the development of a Si quantum computer architecture.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.90.067401