## Non-classical three-photon correlations with a quantum dot strongly coupled to a photonic-crystal nanocavity    [PDF]

Michal Bajcsy, Armand Rundquist, Arka Majumdar, Tomas Sarmiento, Kevin Fischer, Konstantinos G. Lagoudakis, Sonia Buckley, Jelena Vuckovic
We use the third-order autocorrelation function $g^{(3)}(\tau_1,\tau_2)$ to detect the non-classical character of the light transmitted through a photonic-crystal nanocavity containing a strongly-coupled quantum dot probed with a train of coherent light pulses. We observe bunching in $g^{(3)}$ for transmitted photons when the probe laser is resonant with the third manifold, and anti-bunching when the probe laser is tuned away from resonance. We contrast the value of $g^{(3)}(0, 0)$ with the conventionally used $g^{(2)}(0)$ and demonstrate that in addition to being necessary for detection of two-photon states emitted by a low-intensity source, $g^{(3)}$ provides a more robust diagnostic tool to detect the non-classical character of a light source.
View original: http://arxiv.org/abs/1307.3601