A quantum communication network can be constructed by distributing amultipartite entangled state to space-separated nodes. Entangled optical beamswith highest flying speed and measurable brightness can be used as carriers toconvey information in quantum communication networks. Losses and noisesexisting in real communication channels will reduce or even totally destroyentanglement. The phenomenon of disentanglement will result in the completefailure of quantum communication. Here, we present the experimentaldemonstrations on the disentanglement and the entanglement revival oftripartite entangled optical beams used in a quantum network. We discover thatsymmetric tripartite entangled optical beams are robust in pure lossy butnoiseless channels. While in a noisy channel the excess noise will lead to thedisentanglement and the destroyed entanglement can be revived by the use of acorrelated noisy channel (non-Markovian environment). The presented resultsprovide useful technical references for establishing quantum networks.
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