SAMOP 2023 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 25: Quantum Entanglement II

QI 25.5: Vortrag

Donnerstag, 9. März 2023, 12:00–12:15, B302

Number-phase uncertainty relations and bipartite entanglement detection in spin ensembles — Giuseppe Vitagliano^1,2, Matteo Fadel^3,4, Iagoba Apellaniz^2,5, Matthias Kleinmann^6,2, Bernd Lücke⁷, Carsten Klempt^7,8, and •Géza Tóth^2,9,10,11 — ¹Institute for Quantum Optics and Quantum Information, AT-1090 Vienna, Austria — ²UPV/EHU, ES-48080 Bilbao, Spain — ³ETH Zürich, CH-8093 Zürich, Switzerland — ⁴University of Basel, CH-4056 Basel, Switzerland — ⁵Mondragon Unibertsitatea, ES-20500 Mondragón, Spain — ⁶Universität Siegen, DE-57068 Siegen, Germany — ⁷Leibniz Universität Hannover, DE-30167 Hannover, Germany — ⁸Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Satellitengeodäsie und Inertialsensorik, DLR-SI, DE-30167 Hannover, Germany — ⁹DIPC, ES-20080 San Sebastián, Spain — ¹⁰IKERBASQUE, Basque Foundation for Science, ES-48011 Bilbao, Spain — ¹¹Wigner RCP, HU-1525 Budapest, Hungary

We present a method to detect bipartite entanglement and EPR steering based on number-phase-like uncertainty relations in split spin ensembles. In particular, we show how to detect bipartite entanglement in an unpolarized Dicke state of many spin-1/2 particles. We demonstrate the utility of the criteria by applying them to a recent experiment given in K. Lange et al. [Science 360, 416 (2018)]. Our methods also work well if split spin-squeezed states are considered. We discuss how to handle experimental imperfections.

[1] G. Vitagliano et al., arXiv:22104.05663.