Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 24: Quantum Effects: Entanglement and Decoherence III
Q 24.6: Talk
Tuesday, March 24, 2015, 15:45–16:00, B/gHS
Entanglement of twisted photons in a e− e+ → 2γ annihilation — •Dmitry Karlovets1,2 and Antonino Di Piazza1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany — 2Tomsk Polytechnic University, Lenina 30, 634050 Tomsk, Russia
We show that in the electron-positron annihilation process e− e+ → 2γ, when one of the initial particles carries some orbital angular momentum (vortex state) [1], the final photons become entangled in their quanta of orbital angular momentum [2]. This entanglement takes place only when the final photons are measured not as "pure" vortex states but as coherent superpositions with a non-vanishing quantum uncertainty of the orbital angular momentum, exactly as in quantum optics with twisted photons. Possibilities for experimental observation of such an entanglement and further generalizations to other quantum processes are discussed.
[1] D. V. Karlovets, Phys. Rev. A vol. 86, 062102 (2012). [2] D. V. Karlovets and A. Di Piazza, in preparation.