Quantum mechanics provides the means for solving certain communication tasks more efficiently than is possible classically. Photons entangled in multiple degrees of freedom could provide a route to fully tap that potential.
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Walborn, S. Breaking the communication barrier. Nature Phys 4, 268–269 (2008). https://doi.org/10.1038/nphys927
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DOI: https://doi.org/10.1038/nphys927
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