Electronic Raman spectroscopy (ERS) of donors in silicon for quantum computing: getting at the exchange coupling constant (J)

Full text: When fabricating a solid-state quantum computer (QC) based on phosphorous donor atoms in silicon, establishing that controlled electronic wavefunction overlap has been achieved is a prerequisite to donor entanglement. Recently, an optical method capable of estimating the strength of wavefunction overlap between neighbouring phosphorous donors and the distribution of donors in an ensemble has been proposed. Based on electronic Raman scattering (ERS), the technique promises to provide a direct measure of the exchange coupling constant (J). In this work, we report on the observation of the ERS signal from donors in an engineered substrate. Using various donor placement strategies including ion implantation, we report on our progress towards measuring J. Copyright (2005) Australian Institute of Physics