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It's effective use in Quantum Computation?

Optical Parametric Generation

In the photon picture shown above, a high frequency photon (blue) enters a crystal and is split into two lower frequency photons (green and red). Conservation of energy means that the sum of the frequencies of the green and red photons must equal the frequency of the blue photon. This is reflected in the equation for parametric generation above. The crystal itself belongs to a particular class, known as nonlinear crystals (examples include lithium niobate, BBO, KTP and RTA). Although all transparent materials will exhibit nonlinear optical effects, the coefficient that determines the strength of the nonlinear interaction is particularly large for nonlinear crystals.

http://www.st-andrews.ac.uk/~oponet/Beginners%20Guide/NL%20optics.html [Broken]

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# The Halo and the Non Linear Crystal

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