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Cyclic transformation of orbital angular momentum modes

Autor(en)
Florian Schlederer, Mario Krenn, Robert Fickler, Mehul Malik, Anton Zeilinger
Abstrakt

The spatial modes of photons are one realization of a QuDit, a quantum system that is described in a D-dimensional Hilbert space. In order to perform quantum information tasks with QuDits, a general class of D-dimensional unitary transformations is needed. Among these, cyclic transformations are an important special case required in many high-dimensional quantum communication protocols. In this paper, we experimentally demonstrate a cyclic transformation in the high-dimensional space of photonic orbital angular momentum (OAM). Using simple linear optical components, we show a successful four-fold cyclic transformation of OAM modes. Interestingly, our experimental setup was found by a computer algorithm. In addition to the four-cyclic transformation, the algorithm also found extensions to higher-dimensional cycles in a hybrid space of OAM and polarization. Besides being useful for quantum cryptography with QuDits, cyclic transformations are key for the experimental production of high-dimensional maximally entangled Bell-states.

Organisation(en)
Quantenoptik, Quantennanophysik und Quanteninformation
Externe Organisation(en)
Österreichische Akademie der Wissenschaften (ÖAW), University of Ottawa
Journal
New Journal of Physics
Band
18
Anzahl der Seiten
8
ISSN
1367-2630
DOI
https://doi.org/10.1088/1367-2630/18/4/043019
Publikationsdatum
04-2016
Peer-reviewed
Ja
ÖFOS 2012
103026 Quantenoptik
Schlagwörter
ASJC Scopus Sachgebiete
Allgemeine Physik und Astronomie
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/ee0e85ac-0892-4fea-a1b5-52cf6bc73caf