It is possible to noiselessly amplify a quantum state by first deliberately increasing its noise. This paradoxical result may have important applications in quantum communication and metrology.
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Dunningham, J. Needling the haystack. Nature Phys 6, 718–719 (2010). https://doi.org/10.1038/nphys1795
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DOI: https://doi.org/10.1038/nphys1795
