Entanglement And Non-Trivial Topologies
  We consider states defined on non-trivial topologies of Torus, Mobius and Torus-Mobius. Adequate operators leading to the construction of coherent states, two-mode coherent states and entangled states are derived and we show a class of entangled states on Torus that are related to the entanglement of photons by orbital angular momentum states. 
Thiago Prudencio, Diego Julio Cirilo-Lombardo
quant-ph cond-mat.str-el hep-th math-ph math.MP