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Pastimes : IT CAME FROM OUTER SPACE -- Ignore unavailable to you. Want to Upgrade?

To: kinkblot who wrote (170)	2/24/1999 3:24:00 PM
From: Don Pueblo	Respond to of 480

WOW! WOW!

To: kinkblot who wrote (170)	2/2/2001 4:32:16 PM
From: kinkblot	Respond to of 480

Storage of Light in Atomic Vapor paper by Walsworth, Lukin et al. in Physical Review Letters, Volume 86, Number 5 (29 Jan 2001), pages 783-786 prl.aps.org DARK-STATE POLARITONS! The gist of it from the third page, bottom of first column: [with the control field held constant] ...after initial pulse compression at the entrance of the cell, the polariton describes the well-known EIT-like propagation of coupled light and atomic coherence. Remarkably, however, when the intensity of the control field is changed during the pulse's propagation through the atomic medium, the polariton can preserve its shape, amplitude, and spatial length, while its group velocity and the ratio of the light and matter components are altered. In particular, when the group velocity is reduced to zero by turning off the control beam, the polariton becomes purely atomic and its propagation is stopped. The state of the input light pulse is thereby mapped into the atomic coherence. DARK-STATE POLARITONS! Then, after a 'storage' interval, the control beam is turned back on, which reverses the process; the polariton accelerates and the atomic coherence is mapped back into light. In principle, since the "atomic spin excitations do not couple to electronic excited states and are thus immune to spontaneous emission," complete retrieval (with preservation of phase and quantum state) of the light pulse is possible. However, in practice the atomic coherence of the stopped polariton will be lost by other mechanisms. DARK-STATE POLARITONS! Also see: aip.org - good summary DARK-STATE POLARITONS! Zippy-mode.