Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 34: Quantum Information (Quantum Communication)
Q 34.5: Vortrag
Dienstag, 6. März 2018, 15:00–15:15, K 1.020
Protecting entanglement of twisted photons by adaptive optics — •Giacomo Sorelli1, Nina Leonhard2, Vyacheslav N. Shatokhin1, Claudia Reinlein2, and Andreas Buchleitner1 — 1Physikalisches Institut, Albert-Ludwigs-Unversität Freiburg i. Br. — 2Fraunhofer Institute for Applied Optics and Precision Egineering, Jena
Spatial excitations of the electromagnetic field carrying orbital angular momentum (OAM), often called twisted photons, can be used to encode high dimensional quantum (entangled) states. These states are not only of fundamental interest, but also practically useful, since they can enhance channel capacity and security in quantum communication. However, transmission across a turbulent atmosphere introduces random phase-fluctuations of the photon's wavefront that destroy the information therein encoded. In this talk we consider the propagation of OAM entangled qutrit and ququart states. We show how phase front correction by methods of adaptive optics can significantly reduce crosstalk to OAM modes outside the encoding subspace, and thereby improve stability of high dimensional entanglement in atmospheric turbulence.