We show theoretically that concurrent interactions in a second-order nonlinear medium placed inside an optical resonator can generate multipartite entanglement between the resonator modes. We show that there is a mathematical connexion between this system and van Loock and Braunstein's proposal for entangling N continuous quantum optical variables by interfering the outputs of N degenerate optical parametric amplifiers (OPA) at a N-port beam splitter. Our configuration, however, requires only one nondegenerate OPA and no interferometer. In a preliminary experimental study, we observe the concurrence of the appropriate interactions in periodically poled RbTiOAsO4.
@article{arxiv.quant-ph/0404049,
title = {Multipartite continuous-variable entanglement from concurrent nonlinearities},
author = {Olivier Pfister and Sheng Feng and Gregory Jennings and Raphael Pooser and Daruo Xie},
journal= {arXiv preprint arXiv:quant-ph/0404049},
year = {2009}
}
Comments
Accepted by Phys. Rev. A. 4 pages, 2 figures. V.3: minor typos corrected, one reference added