Realization of an all-optical zero to π cross-phase modulation jump

Ryan M. Camacho, P. Ben Dixon, Ryan T. Glasser, Andrew N. Jordan, John C. Howell

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14 Scopus citations


We report on the experimental demonstration of an all-optical π cross-phase modulation jump. By performing a preselection, an optically induced unitary transformation, and then a postselection on the polarization degree of freedom, the phase of the output beam acquires either a zero or π phase shift (with no other possible values). The postselection results in optical loss in the output beam. An input state may be chosen near the resulting phase singularity, yielding a π phase shift even for weak interaction strengths. The scheme is experimentally demonstrated using a coherently prepared dark state in a warm atomic cesium vapor.

Original languageAmerican English
Article number013902
JournalPhysical Review Letters
Issue number1
StatePublished - 5 Jan 2009
Externally publishedYes


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