X iv :0 90 4. 20 57 v1 [ qu an tph ] 1 4 A pr 2 00 9 Continuous-Time Classical and Quantum Random Walk on Direct Product of Cayley Graphs S. Salimi ∗, M. A. Jafarizadeh † Department of Physics, University of Kurdistan, Kurdistan 51664, Iran. Department of Theoretical Physics and Astrophysics, Tabriz University, Tabriz 51664, Iran. Institute for Studies in Theoretical Physics and Mathematics, Te...