Abstract
Twin photons can be entangled in transverse momentum and position, giving rise to the so-called quantum images. The term quantum image has been used for images measured with photon coincidence schemes, also called correlated images. Some kinds of correlated images are prepared by transferring the angular spectrum of the pump beam to the correlated twin beams. In this case, it is possible to show that transverse correlations can violate a classical inequality, leading to spatial photon anti-bunching. We briefly review the use of the transfer of the angular spectrum in the production of these non-classical correlations. In addition, we demonstrate experimentally that the quantum image can be prepared partially through the nonlinear interaction and partially by propagation of signal and idler beams through lenses. Using this kind of preparation it is also possible to use a telescope for transmitting the quantum image, compensating the divergence of signal and idler beams.
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