Fig. 2: Atom-polariton correspondence.
Schematic picture of a physical system whose dynamical evolution is equivalent to that of the propagating two-polariton state defined in Eq. (5): A two-level atom is injected from the left with speed vg (in analogy with the polariton group velocity) and propagates towards the detection region (x = xD), through regions characterized by the presence or absence of an external transverse electric field, \(\overrightarrow{F}\).
