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Q: Fachverband Quantenoptik und Photonik

Q 11: Quantum Optics I

Q 11.4: Vortrag

Montag, 9. März 2020, 14:45–15:00, f342

Spatial entanglement and state engineering via four-photon Hong-Ou-Mandel interference — •Alessandro Ferreri, Vahid Ansari, Christine Silberhorn, and Polina Sharapova — University of Paderborn, Paderborn, Germany

Entangled photon states are fundamental element of quantum information and quantum communication processes. For the current state-of-the-art of optical -based technologies, the investigation of highly entangled systems, characterized by a large number of photons, is extremely important.

In this work we have investigated and maximized the degree of spatial entanglement in a spatially bipartite optical system characterized by four photons based on Hong-Ou-Mandel interference with four photons. The four photons are created by a single type-II parametric down-conversion source. With the use of such device and a proper choice of parameters, we have observed an antibunching behaviour as well as fast structured oscillations with a period of the pump wavelength in the coincidence probability. These features of the coincidence probability indicate spatial entanglement. We can modify the structure of such oscillations by varying the mode structure. Furthermore, by opportunely varying the parameters of our device, we can generate different combination of the four-dimensional Bell states. Finally, a small modification of our device allows to generate fringe pattern with smaller periodicity than the pump wavelength, that can be used to increase the sensitivity of measurement.