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Phys Rev Lett. 2010 Jan 15;104(2):020505. Epub 2010 Jan 15.

Measurement of the spiral spectrum of entangled two-photon states.

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Leiden University, Huygens Laboratory, P.O. Box 9504, 2300 RA Leiden, The Netherlands.


We implement an interferometric method to measure the orbital angular momentum (OAM) spectrum of photon pairs generated by spontaneous parametric down-conversion. In contrast with previous experiments, which were all limited by the modal capacity of the detection system, our method operates on the entire down-conversion cone and reveals the complete distribution of the generated OAM. In this geometry, new features can be studied. We show that the phase-matching conditions can be used as a tool to enhance the azimuthal Schmidt number and to flatten the spectral profile, allowing the efficient production of high-quality multidimensional entangled states.

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