Polarization is a convenient way to encode quantum information for cryptography, remote transfer and optical quantum computing, but sharing entanglement is problematic over a noisy link. Hiding in an isolated corner of the state space can make a big difference.
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Pryde, G. The quantum information cocoon. Nature Photon 2, 461–462 (2008). https://doi.org/10.1038/nphoton.2008.142
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DOI: https://doi.org/10.1038/nphoton.2008.142
