Impact of non-adiabatic fields and dissipation on quantum storage and retrieval

Joyee Ghosh; R. Ghosh; Deepak Kumar

doi:10.1117/12.816345

2 February 2009 Impact of non-adiabatic fields and dissipation on quantum storage and retrieval

Joyee Ghosh, R. Ghosh, Deepak Kumar

Proceedings Volume 7226, Advances in Slow and Fast Light II; 72260K (2009) https://doi.org/10.1117/12.816345
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

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.

Citation Download Citation

Joyee Ghosh, R. Ghosh, and Deepak Kumar "Impact of non-adiabatic fields and dissipation on quantum storage and retrieval", Proc. SPIE 7226, Advances in Slow and Fast Light II, 72260K (2 February 2009); https://doi.org/10.1117/12.816345

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