Is orbital angular momentum always conserved in spontaneous parametric down-conversion?

Details Is orbital angular momentum always conserved in spontaneous parametric down-conversion? Is orbital angular momentum always conserved in spontaneous parametric down-conversion?

2007-03-22

arxiv.org/abs/quant-ph/0703212v2

Physics

Quantum Physics

4 pages, 3 figures, submitted to Phys. Rev. Lett. Revised

Scientific paper

10.1117/12.734118

In the non-linear optical process of type-II spontaneous parametric down-conversion, we present on an experiment showing that the two-photon detection amplitude of the down-converted beams does not generally reproduce the transverse profile of the pump beam that carries non-zero orbital angular momentum. We explain this observation by that orbital angular momentum is not conserved in the type-II non-linear process due to the broken rotational symmetry of the Hamiltonian.

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