The demonstration of a phase-sensitive optical amplifier with a noise figure of just 1.1 dB — three times lower than that of a conventional amplifier — could help significantly extend the reach of optical communications systems.
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Li, G. Amplifying to perfection. Nature Photon 5, 385–386 (2011). https://doi.org/10.1038/nphoton.2011.127
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DOI: https://doi.org/10.1038/nphoton.2011.127
