Combining the strong nonlinearity of single-photon emitters with the light-focusing characteristics of metal nanowires could soon enable the realization of a single-photon transistor — a device that would revolutionize the field of quantum optics.
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Orrit, M. Quantum light switch. Nature Phys 3, 755–756 (2007). https://doi.org/10.1038/nphys766
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DOI: https://doi.org/10.1038/nphys766