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Nature Photonics 2, 206–207 (1 April 2008) | doi:10.1038/nphoton.2008.39

Photon turnstiles, strain-tuned lasers, top-timekeeping clocks, greater quantum control, and more

Quantum optics One at a time Science 319, 1062–1065 (2008) Nonlinear optics usually involves the interaction of a large number of photons with a large number of atoms. To reduce this down to the single-atom and single-photon level, the strength of the interaction between light and matter must be enhanced.