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

Steinlechner, Fabian, Ecker, Sebastian, Fink, Matthias, Liu, Bo, Bavaresco, Jessica, Huber, Marcus, Scheidl, Thomas, Ursin, Rupert·2017·Nature Communications
DOI 10.1038/ncomms15971PMC PMC5527279
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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.

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  • The cost, wavelength selectivity and difficulty of generating qudits with spiral wave plates limit their applicability.

    “However, their cost, the selectivity in wavelength and the hardness to generate qudits still limit their applicability [49].”

    From Photonic quantum information processing: a review (2019) · cites this paper as [49]

    The Abstract discusses adaptive-optics challenges for orbital-angular-momentum encoding, and the Discussion describes a two-dimensional limit of the paper’s calcite-based measurements. Neither passage addresses spiral wave plates or their cost, wavelength selectivity, or difficulty generating qudits. Searches for those specific terms found no supporting passage in our copy. (LLM, conf=0.74)

    Experimental — accuracy not yet measured

  • Q-plate applications include generation of intra-photon entanglement between polarization and OAM degrees of freedom.

    “Applications offered by the QP [39,49,64,65,67] include the generation of intra-photon entanglement between polarization and OAM degrees of freedom by producing states of the form”

    From Photonic quantum information processing: a review (2019) · cites this paper as [49]

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Metadata

Authors
Steinlechner, F., Ecker, S., Fink, M., Liu, B., Bavaresco, J., Huber, M., Scheidl, T., & Ursin, R.
Venue
Nature Communications
Publisher
Springer Science and Business Media LLC
Published
2017-07-24
Volume
8
Issue
1
ISSN
2041-1723
DOI
10.1038/ncomms15971
PMC
PMC5527279
Cited by
173
References
6
Language
en
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