Controlling Irreversibility and Directional Flow of Light with Atomic Motion

Details Controlling Irreversibility and Directional Flow of Light with Atomic Motion Controlling Irreversibility and Directional Flow of Light with Atomic Motion

2008-07-22

arxiv.org/abs/0807.3511v1

Physics

Quantum Physics

5 pages, 5 figures

Scientific paper

The Doppler effect of moving atoms can create irreversibility of light. We show that the laser field in electromagnetic induced transparency (EIT) scheme with atomic motion can control the directional propagation of two counter-propagating probe fields in atomic gas cell. The quantum coherence effect serves as an optical transistor. Interference of the two output fields from the cell shows useful feature for determining the mean atomic velocity and can be useful as quantum velocimeter. We also find that the sign of the dispersive phase in EIT has a unique property, which helps to explain certain features in the interference.

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