Quantum Optics Seminar by Paul-Antoine Moreau – University of Copenhagen

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Quantum Optics Seminar by Paul-Antoine Moreau

Spatial aspects ofentanglement in parametric amplification: Einstein-Podolsky-Rosen paradox in twin images and Hong-Ou-Mandel experiment

We study spatial aspects of entanglement, first in the context of spontaneous down conversion of light exhibiting high dimensional entanglement, and in a second step through a simulated Hong-Ou-Mandel experiment. The first part of this study demonstrate an Einstein-Podolsky-Rosen paradox in its original formulation, e.g. in the context of position and momentum correlations. We detect photons by mean of special cameras including a gain register, called EMCCD cameras, able to count photon arrival on each pixel. By taking direct images of the fluorescence beams, we demonstrate a strong degree of EPR paradox. The second part of this study aim to demonstrate, by mean of simulations, the possibility to obtain a full field coalescence of fluorescence photons, due to the Hong-Ou-Mandel effect. Starting from the observation that the HOM effect exhibits a nonlocal behaviour, we establish a Bell inequality on the two photons interference phenomenon itself. We then show that the original 1935 EPR state is able to violate this Bell inequality. 

Key Words : EPR paradox, High dimensional entanglement, HOM interference, Nonlocality, Twin images