Topological order in Josephson junction ladders with Mobius boundary   conditions
  We propose a CFT description for a closed one-dimensional fully frustrated ladder of quantum Josephson junctions with Mobius boundary conditions, in particular we show how such a system can develop topological order. Such a property is crucial for its implementation as a "protected" solid state qubit. 
G. Cristofano, V. Marotta, A. Naddeo (Univ. degli Studi di Napoli)