Bonn 2025 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 5: Quantum Entanglement I
QI 5.3: Vortrag
Montag, 10. März 2025, 17:45–18:00, HS IX
Metrological entanglement criteria — •Szilárd Szalay1 and Géza Tóth1,2 — 1Wigner Research Centre for Physics, Budapest, Hungary — 2University of the Basque Country UPV/EHU, Bilbao, Spain
We show that the Quantum Fischer Information in quantum metrology puts a lower bound on the Average Size of Entangled Subsystems. This is a particular case of a new kind of multipartite entanglement criteria, restricting the relative weights of the pure states of different average size of entangled subsystems in the mixture. We illustrate the strength of this convex criterion and compare it to the original metrological entanglement criterion in terms of the usual entanglement depth.
Keywords: multipartite entanglement; partial separability; metrological entanglement criteria; metrological bounds