  A review of discrete quantum walk with two particle is given. The use of
different states encountered in identical particle, and the idea of
entanglement and superposition is explored to explored the interesting dynamics
of two particle quantum walk. Boundary conditions can specify certain dynamics
and so a survey of periodic boundary condition (circle) is presented. A
simulation for a Hadamard walk for different periods of a circle is considered
and results are compared for various periods and for a case with absorbing
boundaries.
