HBT Experiment Those who have conducted quantum optics experiments must be familiar with the Hanbury Brown and Twiss (HBT) experiment, which can be used to measure the second-order correlation function g2. In this experiment, a beam of light is split into two using a 50:50 beamsplitter, and then each beam is detected separately by two detectors. The correlation of the intensities on both sides is measured as a function of delay, as shown in the figure below:...