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Seminar by Guillermo GarcĂ­a [University of Turku]

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people 2020/01/22

Seminar by Guillermo García [University of Turku]

DATE: 28 January 2020 (14:30h)

PLACE: Aula 3.20, 3rd floor, Faculty of Physics (Dpt.Física de la Matèria Condensada)

TITLE: Pairwise tomography networks for many-body quantum systems

ABSTRACT: We introduce the concept of pairwise tomography networks to characterise quantum properties in many-body systems and demonstrate an efficient protocol to measure them experimentally. Pairwise tomography networks are generators of multiplex networks where each layer represents the graph of a relevant quantifier such as, e.g., concurrence, quantum discord, purity, quantum mutual information, or classical correlations. We propose a measurement scheme to perform two-qubit tomography of all pairs showing exponential improvement in the number of qubits N with respect to previously existing methods. We illustrate the usefulness of our approach for device characterisation and quantum simulations.