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QI: Fachverband Quanteninformation
QI 15: Quantum Information: Concepts and Methods II
QI 15.3: Vortrag
Donnerstag, 12. März 2026, 10:00–10:15, BEY/0137
Entanglement detection close to Dicke states with many-body correlations — •Géza Tóth1,2,3,4, Martin Quensen5,6, Mareike Hetzel5,6, Luis Santos5, Augusto Smerzi7,8,9, Luca Pezzè7,8,9, and Carsten Klempt5,6 — 1Theoretical Physics and EHU Quantum Center, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain — 2Donostia International Physics Center (DIPC), 20018 San Sebastián, Spain — 3IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Spain — 4HUN-REN Wigner Research Centre for Physics, 1525 Budapest, Hungary — 5Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany — 6Institut für Satellitengeodäsie und Inertialsensorik (DLR-SI), Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), 30167 Hannover, Germany — 7Instituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche (INO-CNR), 50125 Firenze, Italy — 8European Laboratory for Nonlinear Spectroscopy (LENS), 50019 Sesto Fiorentino, Italy — 9Quantum Science and Technologies in Arcetri (QSTAR), 50125 Firenze, Italy
We will review methods for detecting multipartite entanglement in an ensemble of spin-1/2 atoms with collective measurements. We will introduce entanglement criteria based on the measurement of many-body correlations, such as the parity. Interestingly, such criteria can detect a larger entanglement depth in some practical situations than previous methods. In an experimental application, our criteria require a single-particle resolution in measuring the particle number.
Keywords: Quantum Entanglement; Dicke state