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Friday, July 14, 2006
Cornell researchers demonstrate low-light EIT

Cornell researchers, including investigators from both the School of Applied and Engineering Physics and the Sibley School of Mechanical and Aerospace Engineering, have demonstrated electromagnetically-induced transparency at nanowatt levels, as reported in the 14 July 2006 issue of Physical Review Letters.  Electromagnetically-induced transparency is a nonlinear optical phenomenon in which a spectral absorption feature is rendered transparent via a coherent superposition of quantum states.  It can be used to slow light to very low velocities (tens of meters per second) or used to trap light for quantum data storage.  The reported results were achieved by using a technique known as light-induced atomic desorption to trap a large population of Rubidium atoms inside the core of a chemically-modified photonic bandgap fiber.  The paper is entitled "Low-Light-Level Optical Interactions with Rubidium Vapor in a Photonic Band-Gap Fiber", with authors Ghosh S, Bhagwat AR, Renshaw CK, Goh S, Gaeta AL, and Kirby BJ.
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