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Proceedings Paper

Impact of non-adiabatic fields and dissipation on quantum storage and retrieval
Author(s): Joyee Ghosh; R. Ghosh; Deepak Kumar
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Paper Abstract

In a Λ-type atomic system with electromagnetically-induced transparency, we probe the fidelity of the storage and retrieval of an electromagnetic signal, as the control laser field is varied with time. We study numerically the adiabatic transfer problem for an isolated atom, and show that for a weak signal, even the slowest variations of the control field take the system out of the dark state, which is a coherent superposition of the two lower levels of the Λ system. Following this, we incorporate the effect of dissipation on system dynamics by allowing for spontaneous decay of the system to the lower levels in a wavefunction approach. We conclude that dissipation definitely aids the retrieval process but not so much the storage. Further, for storing the signal, the control field should be switched off as slowly as possible, but while retrieving it, the faster we switch on the control field, the better the signal is retrieved. Also, for a given system there is an optimal control power for the best retrieval. Our results find partial support in the reported experimental observations.

Paper Details

Date Published: 2 February 2009
PDF: 12 pages
Proc. SPIE 7226, Advances in Slow and Fast Light II, 72260K (2 February 2009); doi: 10.1117/12.816345
Show Author Affiliations
Joyee Ghosh, Jawaharlal Nehru Univ. (India)
R. Ghosh, Jawaharlal Nehru Univ. (India)
Deepak Kumar, Jawaharlal Nehru Univ. (India)

Published in SPIE Proceedings Vol. 7226:
Advances in Slow and Fast Light II
Selim M. Shahriar; Philip R. Hemmer; John R. Lowell, Editor(s)

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