Patent ID: 7706694
Filing Date: 2010-04-27
Classification: B82Y,G06N

Abstract:
1. An apparatus for processing complex signals, the apparatus comprising: a source of light; a polarizer in optical communication with the source of light, the polarizer configured to produce polarized light; a polarizing beam splitter in optical communication with the polarizer, the polarizing beam splitter configured to produce light having a first polarization and light having a second polarization, the first polarization being different from the second polarization; a first aperture configured to receive the light having the first polarization and produce first encoded light, the first encoded light being encoded with first information; a second aperture configured to receive the light having the second polarization and produce second encoded light, the second encoded light being encoded with second information; at least two adjacent nonlinear crystals configured to receive the first encoded light and the second encoded light, the two adjacent nonlinear crystals being separated by a distance; and a coincidence counter configured to detect coincidences between entangled photons, the entangled photons exiting the at least two adjacent nonlinear crystals.