Quantum information protocols based on continuous-variable entangled states are attractive because they exploit standard optical modulation and measurement equipment, and do not require single photons. Recent progress in the field is reversing initial concerns about the practicality of the approach.
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Ralph, T., Lam, P. A bright future for quantum communications. Nature Photon 3, 671–673 (2009). https://doi.org/10.1038/nphoton.2009.222
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DOI: https://doi.org/10.1038/nphoton.2009.222
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