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We study electromagnetically induced transparency of a ladder typeconfiguration in ultracold atomic gases, where the upper level is anelectronically highly excited Rydberg state. The strong two-body interaction inthe Rydberg state leads to the excitation blockade, where all but one atoms areshifted out of resonance such that the transmission of the probe light isaffected. We show that molecular coupling in the Rydberg state causes aneffective, two-body dephasing. The presence of the two-body dephasing leads toa similar blockade effect. Hence the overall blockade effect is enhanced by thetwo-body dephasing. Through numerical and approximately analyticalcalculations, we find that the transmission is reduced drastically by thepresence of two-body dephasing in the transparent window, which is accompaniedby strong photon-photon anti-bunching. Around the Autler-Townes splitting, thephoton bunching is amplified by the two-body dephasing.

Electromagnetically Induced Transparency of Interacting Rydberg Atoms with Two-Body dephasing