title: Disentangling the exchange coupling of entangled donors in the Si quantum computer architecture.
abstract: 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.
authors.affiliation: Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA.
authors.forename: Belita
authors.initials: B
authors.lastname: Koiller
authors.forename: Xuedong
authors.initials: X
authors.lastname: Hu
authors.forename: H D
authors.initials: HD
authors.lastname: Drew
authors.forename: S Das
authors.initials: SD
authors.lastname: Sarma