Figure 3From: Enhanced Hanbury Brown and Twiss interferometry using parametric amplificationSchematic diagram of our improved HBT interferometer. There are two OPAs placed at \({r_{1}}\) and \({r_{2}}\). One input of the OPAs is the star light and the other input is the vacuum state (VAC). Two outputs given by, \({\hat{a}_{\text{1,out}}}\) and \({\hat{a}_{\text{2,out}}}\), are detected and the signals are injected into the correlatorBack to article page