We describe an interaction mechanism between electron spins in a vertically-stacked double quantum dot that can be used for controlled two-qubit operations. This interaction is mediated by excitons confined within, and delocalized over, the double dot. We show that gates equivalent to the SQRT-SWAP gate can be obtained in times much less than the exciton relaxation time and that the negative effects of hole-mixing and spontaneous emission do not seriously affect these results.
@article{arxiv.cond-mat/0609094,
title = {Optically-controlled logic gates for two spin qubits in vertically-coupled quantum dots},
author = {C. Emary and L. J. Sham},
journal= {arXiv preprint arXiv:cond-mat/0609094},
year = {2015}
}
Comments
12 pages, 3 figures; expanded for clarity + minor changes, J-ref added