Demonstration of one-dimensional quantum random walks using orbital angular momentum of photons
Pei Zhang, Xi‐Feng Ren, Xu‐Bo Zou, Bi‐Heng Liu, Yun‐Feng Huang, Guang‐Can Guo · Physical Review A · 2007
Quantum random walks have attracted special interest because they could lead to new quantum algorithms. Photons can carry orbital angular momentum (OAM) thereby offering a practical realization of a high-dimensional quantum information carrier. By employing OAM of photons, we experimentally realized the one-dimensional discrete-time quantum random walk. Three steps of a one-dimensional quantum random walk were implemented in our protocol showing the obvious difference between quantum and classical random walks.