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We address the generation of fully inseparable three-mode entangled states ofradiation by interlinked nonlinear interactions in $\chi^{(2)}$ media. We showhow three-mode entanglement can be used to realize symmetric and asymmetrictelecloning machines, which achieve optimal fidelity for coherent states. Anexperimental implementation involving a single nonlinear crystal where the twointeractions take place simultaneously is suggested. Preliminary experimentalresults showing the feasibility and the effectiveness of the interaction schemewith seeded crystal are also presented.Comment: Revised Version. To appear in JOSA

Three-mode entanglement by interlinked nonlinear interactions in optical χ^(2) media