Illustration of (a) the cones of photons in Type-II SPDC, and (b) the relative positions of photon pairs. From my Singular Optics book!
What is quantum entanglement? Part 5: Making it happen
What is quantum entanglement? Part 5: Making it happen
Illustration of (a) the cones of photons in Type-II SPDC, and (b) the relative positions of photon pairs. From my Singular Optics book!
Skulls in the Stars 
