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Bulletin of the American Physical Society

Influence of atomic coherence diffusion on EIT and stored light

Yanhong Xiao, Irina V. Novikova, David H. Phillips, Ronald Lee Walsworth

Published May 18, 2005• 0 citations
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The storage of light using electromagnetically induced transparency (EIT) has become a well-known technique, with an obvious prospect for future quantum information systems. Utilizing this unique light-matter interaction, the complex amplitude of a 'probe' pulse can be stored onto the ground-state coherence of room-temperature atomic ensemble and can be retrieved after a controllable delay. The storage fidelity is limited by decay mechanisms of the ground-state coherence. This paper presents the study of the spatial behavior of two- and three-dimensional probe fields, under the influence of the thermal atomic diffusion.
How to store and process the quantum information is one of the core issues for the present study of quantum information.With numerical simulation method,the process of stored photonic information was based on the technique of electromagnetically induced transparency(EIT).And then,the influence on the storing process by changes of the coupling coefficient between the signal light and the atom,the atoms relaxation rate,and the controlling light were discussed.It shows that the output signal impulse is stronger with great strength of the coupling coefficient and the controlling light,and weaker with great atoms relaxation rate.Furthermore,the storage position is influenced by the intensity of controlling light.