We present a novel scheme for performing a conditional phase gate between two spin qubits in adjacent semiconductor quantum dots through delocalized single exciton states, formed through the inter-dot Foerster interaction. We consider two resonant quantum dots, each containing a single excess conduction band electron whose spin embodies the qubit. We demonstrate that both the two-qubit gate, and arbitrary single-qubit rotations, may be realized to a high fidelity with current semiconductor and laser technology.
@article{arxiv.quant-ph/0403225,
title = {Selective spin coupling through a single exciton},
author = {A. Nazir and B. W. Lovett and S. D. Barrett and T. P. Spiller and G. A. D. Briggs},
journal= {arXiv preprint arXiv:quant-ph/0403225},
year = {2007}
}