Superconducting Topological Fluids in Josephson Junction Arrays
  We argue that the frustrated Josephson junction arrays may support a topologically ordered superconducting ground state, characterized by a non-trivial ground state degeneracy on the torus. This superconducting quantum fluid provides an explicit example of a system in which superconductivity arises from a topological mechanism rather than from the usual Landau-Ginzburg mechanism. 
M. Cristina Diamantini, Pasquale Sodano and Carlo A. Trugenberger