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Experimental implementation of higher dimensional time–energy entanglement

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Abstract

Qudit entangled states have proven to offer significant advantages with respect to qubit states regarding the implementation of quantum cryptography or computation schemes. Here we propose and experimentally implement a scalable scheme for preparing and analyzing these states in the time–energy degree of freedom of two-photon pairs. Using the scheme, the entanglement of (2×4)-dimensional states is demonstrated.

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Acknowledgements

We would like to thank Witlef Wieczorek, Nikolai Kiesel, and Wieslaw Laskowski for helpful discussions. We acknowledge the support by the DFG-Cluster of Excellence MAP and an exchange program by DAAD.

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Authors and Affiliations

  1. Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748, Garching, Germany

    D. Richart, Y. Fischer & H. Weinfurter

  2. Ludwig-Maximilians-Universität, Schellingstr. 4, 80797, München, Germany

    D. Richart, Y. Fischer & H. Weinfurter

Authors
  1. D. Richart
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  2. Y. Fischer
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  3. H. Weinfurter
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Correspondence to D. Richart.

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Richart, D., Fischer, Y. & Weinfurter, H. Experimental implementation of higher dimensional time–energy entanglement. Appl. Phys. B 106, 543–550 (2012). https://doi.org/10.1007/s00340-011-4854-z

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