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Twisted light transmission over 143 km
Abstract
Significance: Light is the main carrier of information. Its spatial mode allows the encoding of more than 1 bit per photon, and thus can increase the information capacity. For communication purposes, these modes need to be transmitted over large distances. Nowadays, fiber-based solutions are in their infancy, which renders free-space transmission the only possibility. We present an experiment where we investigate the behavior of the spatial modes after a distance of 143 km. With the help of an artificial neural network, we distinguished different mode superpositions up to the third order with more than 80% accuracy. Our results indicate that with state-of-the-art adaptive optics systems, both classical communication and entanglement transmission is feasible over distances of more than 100 km.
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Topological robustness of optical skyrmions through a real-world free-space link
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Topological state and number transitions of optical skyrmions upon free-space beam propagation
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Metadata
- Authors
- Krenn, M., Handsteiner, J., Fink, M., Fickler, R., Ursin, R., Malik, M., & Zeilinger, A.
- Affiliations
- Faculty of Physics, Vienna Center for Quantum Science and Technology, University of Vienna, A-1090 Vienna, Austria;
- Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, A-1090 Vienna, Austria;
- ORCID
- Malik, Mehul
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2016-11-15
- Volume
- 113
- Issue
- 48
- Pages
- 13648-13653
- ISSN
- 0027-8424
- 1091-6490
- Cited by
- 382
- References
- 2
- Language
- en
- Funders
- EC | European Research Council (SIQS Grant No. 600645 EU-FP7-ICT)
- Austrian Science Fund (SFB F40 (FOQUS))
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