Time reordering of paired photons in a dressed three-level cascade

The two-photon dressing of a three-level system, here the ground state, the exciton and the biexciton of a semiconductor quantum dot, leads to new eigenstates and allows one to manipulate the time ordering of the paired photons without unitary post processing. We show that, after spectral post-selection of the single dressed states, the time ordering of the cascaded photons can be removed or conserved. Our joint experimental and theoretical study demonstrates the high potential of a ladder system to be a versatile source of orthogonally polarized, bunched or antibunched pairs of photons.