  Non-classical multi-photon and number states attracts many people because of
their wide applications in fundamental quantum mechanics tests, quantum
metrology and quantum computation, therefore it is a longstanding aim to
generate such states experimentally. Here, we prepare photon triplets by using
the spontaneously Raman scattering process in a hot atomic ensemble cascaded by
the spontaneous parametric down conversion process in a periodical poled
nonlinear waveguide, the strong temporal correlations of these three photons
are observed. Our experiment represents the first combination of the different
order nonlinear processes and different physical systems, showing the
feasibility of such composite system in this research direction. In addition,
the all photons in the prepared genuine triplet are in telecom band make them
be suitable for long-distance quantum communication in optical fibre.
