Trapping of Weak Signal Pulses by Soliton and Trajectory Control in a Coherent Atomic Gas

Zhiming Chen; Guoxiang Huang

doi:10.1103/physreva.89.033817

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arXiv · 1604.05046

Trapping of Weak Signal Pulses by Soliton and Trajectory Control in a Coherent Atomic Gas

Zhiming Chen·Guoxiang Huang

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Abstract

We propose a method for trapping weak signal pulses by soliton and realizing its trajectory control via electromagnetically induced transparency (EIT). The system we consider is a cold, coherent atomic gas with a tripod or multipod level configuration. We show that, due to the giant enhancement of Kerr nonlinearity contributed by EIT, several weak signal pulses can be effectively trapped by a soliton and cotravel stably with ultraslow propagating velocity. Furthermore, we demonstrate that the trajectories of the soliton and the trapped signal pulses can be manipulated by using a Stern-Gerlach gradient magnetic field. As a result, the soliton and the trapped signal pulses display a Stern-Gerlach deflection and both of them can bypass an obstacle together. The results predicted here may be used to design all-optical switching at very low light level.

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Zhiming Chen, Guoxiang Huang. 2016-04-18. Trapping of Weak Signal Pulses by Soliton and Trajectory Control in a Coherent Atomic Gas. https://doi.org/10.1103/physreva.89.033817

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