Bonn 2025 – scientific programme
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QI: Fachverband Quanteninformation
QI 5: Quantum Entanglement I
QI 5.3: Talk
Monday, March 10, 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 Fisher information in quantum metrology in a multiparticle system provides a lower bound on the average size of entangled subsystems. Before it has been known only that the quantum Fisher Information puts a lower bound on the entanglement depth. We illustrate the strength of this new criterion and compare it to the previous approach.
[1] Sz. Szalay and G. Tóth, arXiv:2408.15350 [quant-ph] [2] Sz. Szalay, Quantum 3, 204 (2019)
Keywords: multipartite entanglement; partial separability; metrological entanglement criteria; metrological bounds