The entanglement of excitonic states in a system of N spatially separated semiconductor microcrystallites is investigated. The interaction among the different microcrystallites is mediated by a single-mode cavity field. It is found that the symmetric sharing of the entanglement (measured by the concurrence) between any pair of the excitonic state with N qubits defined by the number states (vacuum and a single-exciton states) or the coherent states (odd and even coherent states) can be prepared by the cavity field for this system.
@article{arxiv.quant-ph/0212150,
title = {Realization of symmetric sharing of entanglement in semiconductor microcrystallites coupled by a cavity field},
author = {Yu-xi Liu and Adam Miranowicz and Masato Koashi and Nobuyuki Imoto},
journal= {arXiv preprint arXiv:quant-ph/0212150},
year = {2009}
}