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(Color online)(a) Pump-probe experiment with the twin photons. (b) One of the possible schemes for controlling the external time delay τ between the twins [40]. (c) The twin photon transition amplitude in Eq. (22) is nonzero in the diagonal strip of width . The symmetry of photon interactions t4↔t2,t3↔t1 is broken when one of them is delayed. (d) The model molecular level scheme used in our simulations.
