Figure 2
From: Quantum controlled-phase-flip gate between a flying optical photon and a Rydberg atomic ensemble
(Color online) The conditional phase shift vs the frequency of incoming photon pulse in units of 
, with the initial atomic states 
(solid curve) and 
(dotted curve), for (a) 
, (b) 
and (c) 
. Other common parameters: 
, 
, 
, 
and the single-atom cooperativity 
.
