A real-world experiment marks a step towards worldwide quantum communication.
Abstract
Efficient long-distance quantum teleportation1 is crucial for quantum communication and quantum networking schemes2. Here we describe the high-fidelity teleportation of photons over a distance of 600 metres across the River Danube in Vienna, with the optimal efficiency that can be achieved using linear optics. Our result is a step towards the implementation of a quantum repeater3, which will enable pure entanglement to be shared between distant parties in a public environment and eventually on a worldwide scale.
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Ursin, R., Jennewein, T., Aspelmeyer, M. et al. Quantum teleportation across the Danube. Nature 430, 849 (2004). https://doi.org/10.1038/430849a
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DOI: https://doi.org/10.1038/430849a
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