The report of a quantum receiver that can distinguish quadrature-phase-shifted keyed signals with an error rate beyond the standard quantum limit bodes well for improving the performance of coherent optical communication systems.
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Tsujino, K. Receiver beats quantum limit. Nature Photon 7, 87–89 (2013). https://doi.org/10.1038/nphoton.2013.4
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DOI: https://doi.org/10.1038/nphoton.2013.4
