Optically detected measurement of the ground-state population of an ensemble of neutral donors in GaAs

Allen, D.G., Sherwin, M.S. and Stanley, C.R. (2005) Optically detected measurement of the ground-state population of an ensemble of neutral donors in GaAs. Physical Review B, 72, (doi:10.1103/PhysRevB.72.035302)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevB.72.035302

Abstract

Strong resonant elastic light scattering (RELS) from the donor-bound exciton transition in GaAs (1.514 eV) occurs at neutral donors in the ground (1S) state, but not at neutral donors in excited hydrogenic states. When 1.6 THz radiation is incident on an ensemble of neutral donors, we observe up to a 30% decrease in the RELS, corresponding to a decrease in the population of neutral donors in their ground states. This signature allows for optical detection of the ground-state population of donors, and is similar to quantum nondemolition measurement techniques used for readout of ion trap quantum computers. In this scheme, Auger recombination of the bound exciton, which changes the state of the donor during measurement, limits the measurement fidelity and maximum near infrared laser excitation intensity.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Stanley, Professor Colin
Authors: Allen, D.G., Sherwin, M.S., and Stanley, C.R.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
University Centres > Glasgow Materials Research Initiative
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):1550-235X

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