Coherent generation of nonclassical light on a chip via photon-induced   tunneling and blockade
  We report the observation of nonclassical light generated via photon blockade in a photonic crystal cavity with a strongly coupled quantum dot. By tuning the frequency of the probe laser with respect to the cavity and quantum dot resonance we can probe the system in either photon blockade or photon-induced tunneling regime. The transition from one regime to the other is confirmed by the measurement of the second order correlation that changes from anti-bunching to bunching. 
Andrei Faraon, Ilya Fushman, Dirk Englund, Nick Stoltz, Pierre   Petroff, Jelena Vuckovic