Efficient conversion between photons and between photon and atom by stimulated emission

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Original languageEnglish
Article number023819
Journal / PublicationPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number2
Publication statusPublished - 12 Aug 2008
Externally publishedYes


Quantum-state conversion among different information-carrying media is essential in a quantum network. It is found that the many schemes of quantum-state conversion can be unified under one simple process-that is, the parametric process of three-wave mixing. These schemes include quantum-state storage in atomic media, where a photonic state is converted to an atomic Raman state and vice versa, the frequency up- and down-conversion in photonic states, and photonic-state conversion to Brillouin phononic states and vice versa. The efficiency of conversion can in principle reach 100%, and the conversion process is noiseless. When the same idea is applied to a four-wave mixing process, unit conversion efficiency between a two-photon state and a single-photon state can be achieved. When applied to a two-photon entangled state in parametric down-conversion, entangled states of multiple photons can be generated. © 2008 The American Physical Society.

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