It is possible to achieve an arbitrary amount of entanglement between two atoms using only spontaneously emitted photons, linear optics, single photon sources and projective measurements. This is in contrast to all current experimental proposals for entangling two atoms, which are fundamentally restricted to one entanglement bit or ebit.
@article{arxiv.quant-ph/0608158,
title = {How much entanglement can be generated between two atoms by detecting photons?},
author = {L. Lamata and J. J. Garcia-Ripoll and J. I. Cirac},
journal= {arXiv preprint arXiv:quant-ph/0608158},
year = {2007}
}
Comments
4 pages, 3 figures, minor improvements, references added, accepted in PRL