Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 47: Quantum Information (Quantum Communication and Quantum Repeater)
Q 47.3: Talk
Thursday, March 17, 2022, 11:00–11:15, Q-H12
Universal crosstalk decay of OAM photons in random media — •David Bachmann1, Asher Klug2, Mathieu Isoard1, Vyacheslav Shatokhin1, Giacomo Sorelli3, Andreas Buchleitner1, and Andrew Forbes2 — 1Physikalisches Institut, Albert-Ludwigs-Universität, Freiburg i. Br., Germany — 2School of Physics, University of the Witwatersrand, Private Bag 3, Johannesburg 2050, South Africa — 3Laboratoire Kastler Brossel, Sorbonne Université, ENS-Université PSL, Collège de France, CNRS; 4 place Jussieu, F-75252 Paris, France
High-dimensional free-space quantum communication is an active, application-oriented, research area. Most implementations of high-dimensional spatial encoding rely on photonic orbital angular momentum (OAM), but the phase fronts of the corresponding spatial modes are distorted in random media such as turbulence. Recently, it has been predicted [1] that Kolmogorov turbulence may induce crosstalk between Laguerre-Gaussian (LG) modes of opposite OAM. We confirm this behavior numerically as well as experimentally by propagating LG modes in emulated turbulence and artificial random media. Furthermore, we show that the crosstalk decay may be rescaled to a universal function of a single parameter – the ratio between the transverse correlation length of the random medium and the OAM beam’s phase correlation length.
[1] Giacomo Sorelli et al., New J. Phys. 21 023003 (2019)