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We introduce a modification of the standard entanglement swapping protocolwhere the generation of entanglement between two distant modes is realized andverified using only local optical measurements. We show, indeed, that a simplecondition on the purity of the initial state involving also an ancillary modeis sufficient to guarantee the success of the protocol by local measurements{M. Abdi \textit{et al.}, Phys. Rev. Lett. \textbf{109}, 143601 (2012)}]. Weapply the proposed protocol to a tripartite optomechanical system where thenever interacting mechanical modes become entangled and certified using onlylocal optical measurements.

Continuous variable entanglement swapping and its local certification: entangling distant mechanical modes