Giner, L.Veissier, L.Sparkes, B.Sheremet, A.Nicolas, A.Mishina, O.Scherman, M.Burks, S.Shomroni, I.Kupriyanov, D. V.Lam, P. K.Giacobino, E.Laurat, J.2025-12-312025-12-31ORCID:/0000-0002-4421-601X/work/162370664https://hdl.handle.net/1885/733797940If in general the transparency of an initially absorbing medium for a probe field is increased by the presence of a control field on an adjacent transition, two very different processes can be invoked to explain it. One of them is a quantum Fano interference between two paths in the three-level system, which occurs even at low control intensity and gives rise to electromagnetically-induced transparency (EIT), the other one is the appearance of two dressed states in the excited level at higher control intensity, corresponding to the Autler-Townes splitting (ATS). This distinction is particularly critical for instance for the implementation of slow light or optical quantum memories. In a recent paper, P. M. Anisimov, J. P. Dowling and B. C. Sanders proposed a quantitative test to objectively discerning ATS from EIT [1]. We experimentally investigated this test with cold atoms [2] and demonstrated that it is very sensitive to the specific properties of the medium.en201310.1109/CLEOE-IQEC.2013.680163384900299708