2026-06-08T02:43:21Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/120402024-08-27T16:54:20Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Viyuela, O.
author
Rivas, A.
author
Gasparinetti, S.
author
Wallraff, A.
author
Filipp, S.
author
Martín-Delgado Alcántara, Miguel Ángel
2023-06-17T12:26:45Z
2023-06-17T12:26:45Z
2018-02-12
2056-6387
10.1038/s41534-017-0056-9
https://hdl.handle.net/20.500.14352/12040
http://dx.doi.org/10.1038/s41534-017-0056-9
https://www.nature.com
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 measurement of the topological Uhlmann phase for a topological insulator simulated by a system of entangled qubits in the IBM Quantum Experience platform. By making use of ancilla states, otherwise unobservable phases carrying topological information about the system become accessible, enabling the experimental determination of a complete phase diagram including environmental effects. We employ a state-independent measurement protocol which does not involve prior knowledge of the system state. The proposed measurement scheme is extensible to interacting particles and topological models with a large number of bands.
eng
Atribución 3.0 España
Observation of topological Uhlmann phases with superconducting qubits
journal article
URL
https://docta.ucm.es/bitstreams/e5d0c9b1-4f84-404f-8881-8c9b0a946897/download
File
MD5
9bbef48ebad08bdb38c4fa3083e03da9
1223249
application/pdf
Martín Delgado Alcántara MÁ 116 LIBRE+CC.pdf