Multipartite continuous-variable entanglement from concurrent nonlinearities

Details Multipartite continuous-variable entanglement from concurrent nonlinearities Multipartite continuous-variable entanglement from concurrent nonlinearities

2004-04-07

arxiv.org/abs/quant-ph/0404049v3

Phys. Rev. A 70, 020302(R) (2004)

Physics

Quantum Physics

Accepted by Phys. Rev. A. 4 pages, 2 figures. V.3: minor typos corrected, one reference added

Scientific paper

10.1103/PhysRevA.70.020302

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.

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