  We conceive an all-optical representation of the dynamics of two distinct
types of interacting bosons in a double well by an array of evanescently
coupled photonic waveguides. Many-particle interference effects are probed for
various interaction strengths by changing the relative abundance of the
particle species and can be readily identified by monitoring the propagation of
the light intensity across the waveguide array. In particular, we show that
finite inter-particle interaction strengths reduce the many-particle
interference contrast by dephasing. A general description of the many-particle
dynamics for arbitrary initial states is given in terms of two coupled spins by
generalising the Schwinger representation to two particle species.
