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  Twisted photon entanglement through turbulent air across Vienna

Krenn, M., Handsteiner, J., Fink, M., Fickler, R., & Zeilinger, A. (2015). Twisted photon entanglement through turbulent air across Vienna. Proceedings of the National Academy of Sciences of the United States of America, 112(46), 14197-14201. doi:10.1073/pnas.1517574112.

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Genre: Journal Article

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 Creators:
Krenn, Mario1, 2, 3, Author              
Handsteiner, Johannes2, 3, Author
Fink, Matthias2, 3, Author
Fickler, Robert2, 3, Author
Zeilinger, Anton2, 3, Author
Affiliations:
1External Organizations, ou_persistent22              
2University of Vienna, ou_persistent22              
3Austrian Academy of Sciences, ou_persistent22              

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Free keywords: quantum entanglement; photonic orbital angular momentum; quantum communication; large Hilbert space; photonic spatial modes
 Abstract: Photons with a twisted phase front can carry a discrete, in principle, unbounded amount of orbital angular momentum (OAM). The large state space allows for complex types of entanglement, interesting both for quantum communication and for fundamental tests of quantum theory. However, the distribution of such entangled states over large distances was thought to be infeasible due to influence of atmospheric turbulence, indicating a serious limitation on their usefulness. Here we show that it is possible to distribute quantum entanglement encoded in OAM over a turbulent intracity link of 3 km. We confirm quantum entanglement of the first two higher-order levels (with OAM=+/- 1h and +/- 2h). They correspond to four additional quantum channels orthogonal to all that have been used in long-distance quantum experiments so far. Therefore, a promising application would be quantum communication with a large alphabet. We also demonstrate that our link allows access to up to 11 quantum channels of OAM. The restrictive factors toward higher numbers are technical limitations that can be circumvented with readily available technologies.

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Language(s): eng - English
 Dates: 2015-11-17
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000365170400044
DOI: 10.1073/pnas.1517574112
 Degree: -

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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : PNAS
  Other : Proceedings of the National Academy of Sciences of the USA
  Abbreviation : Proc. Natl. Acad. Sci. U. S. A.
Source Genre: Journal
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Publ. Info: Washington, D.C. : National Academy of Sciences
Pages: - Volume / Issue: 112 (46) Sequence Number: - Start / End Page: 14197 - 14201 Identifier: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230