Figure 1From: Enhanced Hanbury Brown and Twiss interferometry using parametric amplificationSchematic diagram of a HBT interferometer. k⃗ and \(\vec{k}^{\prime }\) are the wave vectors of the two rays. The intensities are measured at \({r_{1}}\) and \({r_{2}}\) by two detectors and the signals are combined in an electronic correlator, which calculates the second order correlation functionBack to article page