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Free-space propagation of high-dimensional structured optical fields in an urban environment

MPS-Authors
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Peuntinger,  Christian
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Max Planck Univ Ottawa, Ctr Extreme & Quantum Photon;

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Guenthner,  Kevin
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Max Planck Univ Ottawa, Ctr Extreme & Quantum Photon;

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Banzer,  Peter
Interference Microscopy and Nanooptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Max Planck Univ Ottawa, Ctr Extreme & Quantum Photon;

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Elser,  Dominique
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Max Planck Univ Ottawa, Ctr Extreme & Quantum Photon;

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Marquardt,  Christoph
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Max Planck Univ Ottawa, Ctr Extreme & Quantum Photon;

/persons/resource/persons201115

Leuchs,  Gerd
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Max Planck Univ Ottawa, Ctr Extreme & Quantum Photon;
Univ Ottawa, Dept Phys;

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Citation

Lavery, M. P. J., Peuntinger, C., Guenthner, K., Banzer, P., Elser, D., Boyd, R. W., et al. (2017). Free-space propagation of high-dimensional structured optical fields in an urban environment. SCIENCE ADVANCES, 3(10): e1700552. doi:10.1126/sciadv.1700552.


Cite as: http://hdl.handle.net/21.11116/0000-0000-85A1-3
Abstract
Spatially structured optical fields have been used to enhance the functionality of a wide variety of systems that use light for sensing or information transfer. As higher-dimensional modes become a solution of choice in optical systems, it is important to develop channel models that suitably predict the effect of atmospheric turbulence on these modes. We investigate the propagation of a set of orthogonal spatial modes across a free-space channel between two buildings separated by 1.6 km. Given the circular geometry of a common optical lens, the orthogonal mode set we choose to implement is that described by the Laguerre-Gaussian (LG) field equations. Our study focuses on the preservation of phase purity, which is vital for spatial multiplexing and any system requiring full quantum-state tomography. We present experimental data for the modal degradation in a real urban environment and draw a comparison to recognized theoretical predictions of the link. Our findings indicate that adaptations to channel models are required to simulate the effects of atmospheric turbulence placed on high-dimensional structured modes that propagate over a long distance. Our study indicates that with mitigation of vortex splitting, potentially through precorrection techniques, one could overcome the challenges in a real point-to-point free-space channel in an urban environment.