Electromagnetically-induced-transparency-based cross-phase-modulation at attojoule levels

Lo, HY, Chen YC, Su PC, Chen HC, Chen JX, Yu IA, Chen YF.  2011.  Electromagnetically-induced-transparency-based cross-phase-modulation at attojoule levels, Apr. Physical Review A. 83:4., Number 4


We report the experimental demonstration of electromagnetically-induced-transparency-based cross-phase-modulation at attojoule or, equivalently, few-hundred-photon levels. A phase shift of 0.005 rad of a probe pulse modulated by a signal pulse with an energy of similar to 100 aJ, equivalent to similar to 400 photons, was observed in a four-level system of cold (87)Rb atoms.


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