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"# Measuring $g^2$-correlation using QTM\n",
"Second-order photon correlation measurements $(g^2)$ are fundamental in quantum optics. Amongst many other applications,\n",
"it can provide a clear signature of single-photon emission and enables the validation of quantum light sources.\n",
"Color centers are for instance a typical example of such single photon emitter.\n",
"\n",
"
The second-order correlation function $g^2(\\tau)$ can be computed out of a single detection mode -- one would\n", " generally call it *local* correlations or *autocorrelation* -- or between two detection modes -- in that case one\n", " would typically call it *crossed* or sometimes *non-local* correlations. The latter case is for instance considered\n", " in the Hanbury Brown and Twiss (HBT) interferometry experiment. We invite the interested reader to refer to the\n", " following references for a more in-depth discussion of the HBT effect and correlation measurements:
\n", "