Figure 5
From: Hanbury Brown-Twiss effect without two-photon interference in photon counting regime

The difference of experiments between the HBT effect for the photons with orthogonal polarizations. (a) Is the scheme of experiment to certify the effect of HBT when the photons have the orthogonal polarizations. The polarization of photon 1 and 2 both are 45° with respect to horizontal polarization. (b) Shows the paths in which photon 1 and 2 reach the detectors. (c) Is the scheme in Step III of our experiment. Photon 1 with horizontal polarization only goes to detector A and photon 2 with vertical polarization only goes to detector B. (d) Shows only one path to trigger two-photon coincidence count.