The multipartite polarization entangled states of bright optical beamsdirectly associating with the spin states of atomic ensembles are one of theessential resources in the future quantum information networks, which can beconveniently utilized to transfer and convert quantum states across a networkcomposed of many atomic nodes. In this letter, we present the experimentaldemonstration of tripartite polarization entanglement described by Stokesoperators of optical field. The tripartite entangled states of light at thefrequency resonant with D1 line of Rubidium atoms are transformed into thecontinuous variable polarization entanglement among three bright optical beamsvia an optical beam splitter network. The obtained entanglement is confirmed bythe extended criterion for polarization entanglement of multipartite quantizedoptical modes.
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