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How to create and detect -dimensional entangled photons with an active phase hologram
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup to demonstrate the manipulation of entangled photons with a spatial light modulator. The optically nonlinear crystal (BBO) is pumped with an ultraviolet laser, which generates pairs of photons, entangled in their orbital angular momentum. In the idler beam the photons are controlled with a spatial light modulator and both signal and idler beam are analyzed with fixed phase holograms. The phase hologram of the spatial light modulator is actively controlled with a computer.

Image of FIG. 2.
FIG. 2.

Images (a) show how the astigmatism of the lens term is compensated with the parameter ast. For an is obtained (on the lower right), whereas for all other values general superpositions of Hermite-Gaussian modes are produced. (b) Pictures of the resulting mode for different values of and , which determine the position of the lens term on the SLM. The camera is kept at the same position throughout the measurements.

Image of FIG. 3.
FIG. 3.

(a) Pictures of the downconverted light, transformed into higher-order modes by corresponding phase holograms on the SLM. (b) Coincidence counts of the downconverted beams per . With the SLM a transformation is performed and the correlations are observed via probabilistic mode analyzers. The individual settings are coupler 2, ; coupler 3, ; coupler 5, ; and coupler 6, . The solid lines show the expected coincidences for different settings of the transformation hologram applied to the spatial light modulator (SLM). Only photon pairs with a total angular momentum are expected to show correlations due to the entangled nature of the generated two-photon state.


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Scitation: How to create and detect N-dimensional entangled photons with an active phase hologram