Fig. 1. Experimental setup for holography with undetected light. Laser light (purple) pumps the nonlinear crystal (ppKTP) bidirectionally (beam paths a and d). It generates signal (red) and idler (green) beams either in the forward direction (beam paths b and c) or backward direction (beam paths e and f). Dichroic mirrors DM1 to DM3 separate the different beam paths. Idler light will illuminate the object (beam path c), while its hologram will be detected on the scientific complementary metal-oxide semiconductor (sCMOS) camera with the signal light (beam path e). The mirrors M1 to M3 are the interferometer end mirrors. M2 is mounted on a piezo stage to precisely move the mirror in one direction. Lenses L1 to L5 form the imaging system with the focal distances of 150 mm (L1, L2, and L3), 100 mm (L4), and 125 mm (L5).
Using entangled photons, it is possible to develop a communications system with instantaneous point to point transmission. The only delays in a communication network will be at the transceivers at the network nodes. Most people, and most physicists believe that it is not possible to communicate information faster than the speed of light. However, in my world, experiment trumps theory. I…
