Have you ever tried to throw a die by each hand at once?
For usual dice, with numbers from 1 to 6, the probability to get the numbers equal will be 1/6. For more advanced dice, icosahedron-shaped, it will be 1/20.
A single photon is similar to a die before it is thrown: it is intrinsically probabilistic. Before detection, it has no definite position, or momentum, or polarization. And still, photon pairs can show perfect correlations, as if two dice showed the same numbers every time they were thrown together. This effect - entanglement - has important applications in metrology, imaging, and information transmission.
The FP7-EU project BRISQ2 aims at making bright beams behave in the same way, with many interesting consequences.
More information can be found at www.brisq2.eu