TY - JOUR AU - Viyuela, O. AU - Rivas, A. AU - Gasparinetti, S. AU - Wallraff, A. AU - Filipp, S. AU - Martín-Delgado Alcántara, Miguel Ángel PY - 2018 DO - 10.1038/s41534-017-0056-9 SN - 2056-6387 UR - https://hdl.handle.net/20.500.14352/12040 T2 - NPJ quantum information AB - Topological insulators and superconductors at finite temperature can be characterized by the topological Uhlmann phase. However, a direct experimental measurement of this invariant has remained elusive in condensed matter systems. Here, we report a... LA - eng PB - Nature publishing group KW - HGTE quantum-wells KW - Berrys phase KW - State KW - Insulators KW - Systems KW - Bands TI - Observation of topological Uhlmann phases with superconducting qubits TY - journal article VL - 4 ER -