Geometric phase and second order coherence

What is it about?

During parallel trasport on a flat surface, nothing will have changed if a closed circle has been completed. If the surface instead is curved, a change may arise, which depend on the path taken. We examine this effect on the self-correlation of light by interferometric methods.

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Why is it important?

The geometric phase has been know a long time. The novelty with this experiment is that we investigate it's effect on the second order coherence. That is, how the time correlation of the detection of the light is affected.