Path-controlled time reordering of paired photons in a dressed   three-level cascade
  The two-photon dressing of a "three-level ladder" 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. 
Samir Bounouar, Max Strau\ss, Alexander Carmele, Peter Schnauber,   Alexander Thoma, Manuel Gschrey, Jan-Hindrik Schulze, An...
quant-ph