D. Valente, Y. Li, J. P. Poizat, J. M. Gerard, L. C. Kwek, M. F. Santos, A. Auffeves
We study an initially inverted three-level atom in the lambda configuration embedded in a waveguide, interacting with a propagating single-photon pulse. Depending on the temporal shape of the pulse, the system behaves either as an optimal universal cloning machine, or as a highly efficient deterministic source of maximally entangled photon pairs. This quantum transistor operates over a wide range of frequencies, and can be implemented with today's solid-state technologies.
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http://arxiv.org/abs/1208.5817
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