  Quantum correlations between identical particles are at the heart of quantum
technologies. Recently, particle identity has drawn strong attention as an
essential resource for generating entanglement. Several studies with two
identical particles have shown that the spatial overlap and
indistinguishability between the particles are necessary for generating
bipartite entanglement. On the other hand, researches on the extension to more
than two-particle systems are limited by the practical difficulty to deal with
multiple identical particles in laboratories. In this work, we propose schemes
to generate two fundamental classes of genuine tripartite entanglement, i.e.,
GHZ and W classes, which are experimentally demonstrated with three identical
photons. We also show that the tripartite entanglement class decays from the
genuine entanglement to the full separability as the particles become more
distinguishable from each other. Our results support the prediction that
particle indistinguishability is a fundamental element for entangling identical
particles.
