On-demand single-photon sources with high efficiency are required to realize many of the applications of quantum optics. By exploiting photonic mode transformation in a tapered nanowire, researchers have created a source that has an unprecedented extraction efficiency over an extremely broad spectral range.
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Strauf, S. Towards efficient quantum sources. Nature Photon 4, 132–134 (2010). https://doi.org/10.1038/nphoton.2010.11
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DOI: https://doi.org/10.1038/nphoton.2010.11
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