'Light Storage' and other peculiarities of fast-light atomic medium
Dr. Alexandre Akoulchine
CAOUS, Swinburne University of Technology
Monday 17th October 2005, 11.00AM, Seminar Room AR103, Graduate Research Centre.
All-optical information processing requires the use of photons as carriers of quantum information. Recently broad attention has
been focussed on ‘light storage’ (LS), which is the preservation of the information carried by light for controlled later release.
Such a possibility was suggested  and realized  in an atomic medium under conditions of electromagnetically induced
transparency (EIT). Storage of light in such a medium was explained based on a model of a mixed light-matter excitation (dark state
polariton), which propagates with very small group velocity ("slow-light" medium).
Our experimental observations of LS in rubidium vapour were achieved under conditions where EIT does not exist and the slow-light
dark-state polariton model does not apply. Numerical modelling based on the optical Bloch equations reproduces the essential features
of the experimental observations.
These results will contribute to a deeper understanding of light storage and retrieval using long-lived ground state atomic
coherences. Furthermore, this could result in a reconsideration of the concept of the dark-state polariton and the development of new
schemes and methods for more efficient control of light pulses in atomic media.
 M. Fleischhauer and M.D. Lukin, Phys. Rev. Lett. 84, 5094 (2000).
 D. F. Phillips, et al., Phys. Rev. Lett. 86, 783 (2001).
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