Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Posters: Quantum Optics and Photonics I
Q 13.50: Poster
Monday, March 9, 2020, 16:30–18:30, Empore Lichthof
Entanglement of High-Energy Photons — •Michael E. N. Tschaffon1, Maxim A. Efremov1,2, and Wolfgang P. Schleich1,2 — 1Institut für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany — 2Institut für Quantentechnologien, Deutsches Zentrum für Luft- und Raumfahrt (DLR), D-89077 Ulm, Germany
For decades, photons have been used extensively as a tool to verify in a laboratory many practical effects based on entanglement. Nowadays, pairs of such entangled photons are mostly produced for visible light by means of parametric down-conversion. However, many applications require sources operating in other domains such as the radio frequency or even the X-ray domain. We consider the decay of positronium (a bound state comprised of an electron and a positron) in its ground state as a new source of two high-energy entangled photons. The ground state is treated non-relativistically whereas the decay is examined perturbatively in the framework of QED. We investigate the degree of entanglement of the produced photons in both polarization and momentum.