Abstract
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 aJ, equivalent to photons, was observed in a four-level system of cold atoms.
- Received 26 October 2010
DOI:https://doi.org/10.1103/PhysRevA.83.041804
©2011 American Physical Society