Fig. 1

Principle of classical SHWS and PCB-SHWS. For simplicity, we show the light fields from a single aperture. a Classical SHWS. The inset shows a focused spot inside a microlens aperture with a width 300 μm using an 808-nm laser as the light source, taken by the EMCCD with the EM gain set to 0. b PCB-SHWS. At the microlens and its back focal plane, respectively, two balls with the same color represent an entangled photon pair. A tilt phase leads to the centroid displacement. The inset is the biphoton centroid marginal distribution inside an aperture from our phase measurement experiment