Figure 1
From: A Rydberg atom-based amplitude-modulated receiver using the dual-tone microwave field
(a) The relevant energy levels diagram of 85Rb. (b) The schematic of the experimental setup. PD, photodiode detector; HR, high reflective mirror; DM, dichroic mirror; HWP, half-wave plate; PBS, polarization beam splitter; L, lens; M, high reflection mirror; EIT, electromagnetically induced transparency spectroscopy; SAS, saturation absorption spectroscopy; Horn, horn antenna; SG, vector signal generator; AFG, arbitrary function generator; PRBS, pseudo-random binary sequence; E-MW, encoded microwave