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MON: Monday Contributed Sessions
MON 9: Quantum Entanglement
MON 9.3: Talk
Monday, September 8, 2025, 14:45–15:00, ZHG101
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, Quantum 9, 1718 (2025)
[2] Sz. Szalay, Quantum 3, 204 (2019)
Keywords: multipartite entanglement; partial separability; metrological entanglement criteria; metrological bounds