2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53198We propose a CFT description for a closed one-dimensional fully frustrated ladder of quantum Josephson junctions with Mobius boundary conditions (see cond-mat/0503555; we show how such a system can develop topological order thanks to flux fractionalization. Such a property is crucial for its implementation as a "protected" solid state qubit.19 pages, 3 figures, to appear in Proceedings of PI-2005, 8-th International Conference on Path Integrals. From Quantum Information to CosmologyHigh Energy Physics - Theorytext