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Distribution of high-dimensional entanglement via an intra-city free-space link

Author

Listed:
  • Fabian Steinlechner

    (Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences)

  • Sebastian Ecker

    (Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences)

  • Matthias Fink

    (Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences)

  • Bo Liu

    (Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences
    School of Computer, NUDT)

  • Jessica Bavaresco

    (Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences)

  • Marcus Huber

    (Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences)

  • Thomas Scheidl

    (Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences)

  • Rupert Ursin

    (Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences
    Vienna Center for Quantum Science and Technology (VCQ), Faculty of Physics, University of Vienna)

Abstract

Quantum entanglement is a fundamental resource in quantum information processing and its distribution between distant parties is a key challenge in quantum communications. Increasing the dimensionality of entanglement has been shown to improve robustness and channel capacities in secure quantum communications. Here we report on the distribution of genuine high-dimensional entanglement via a 1.2-km-long free-space link across Vienna. We exploit hyperentanglement, that is, simultaneous entanglement in polarization and energy-time bases, to encode quantum information, and observe high-visibility interference for successive correlation measurements in each degree of freedom. These visibilities impose lower bounds on entanglement in each subspace individually and certify four-dimensional entanglement for the hyperentangled system. The high-fidelity transmission of high-dimensional entanglement under real-world atmospheric link conditions represents an important step towards long-distance quantum communications with more complex quantum systems and the implementation of advanced quantum experiments with satellite links.

Suggested Citation

  • Fabian Steinlechner & Sebastian Ecker & Matthias Fink & Bo Liu & Jessica Bavaresco & Marcus Huber & Thomas Scheidl & Rupert Ursin, 2017. "Distribution of high-dimensional entanglement via an intra-city free-space link," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15971
    DOI: 10.1038/ncomms15971
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    Cited by:

    1. Mujtaba Zahidy & Domenico Ribezzo & Claudia Lazzari & Ilaria Vagniluca & Nicola Biagi & Ronny Müller & Tommaso Occhipinti & Leif K. Oxenløwe & Michael Galili & Tetsuya Hayashi & Dajana Cassioli & Anto, 2024. "Practical high-dimensional quantum key distribution protocol over deployed multicore fiber," Nature Communications, Nature, vol. 15(1), pages 1-6, December.

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