Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Quantum Information (Quantum Communication)

Q 34.4: Talk

Tuesday, March 6, 2018, 14:45–15:00, K 1.020

Propagation of high-dimensional twisted photons through atmospheric turbulence — •Timon Eichhorn, Giacomo Sorelli, Vyacheslav N. Shatokhin, and Andreas Buchleitner — Albert-Ludwigs-Universität, Freiburg i. Br.

Twisted photons are single excitations of electro-magnetic field modes characterized by helical phase fronts, and thus carry orbital angular momentum (OAM). The infinite dimension of the underlying Hilbert space makes these light modes potentially suitable for free space quantum communication. The main hurdle towards the latter application is the instability of twisted photons against turbulence-induced scattering into states lying outside the encoding subspace, leading, as a result, to the loss of information. We seek to identify high-dimensional OAM states which are most robust under such conditions, and present analytical as well as numerical results for the robustness of single photon superpositions of up to thirty OAM states.