Tuesday, May 9, 2017

This Ain't Yer Gradma's Squeezed Vacuum!?

Multi-pass configuration for Improved Squeezed Vacuum Generation in Hot Rb Vapor

We study a squeezed vacuum field generated in hot Rb vapor via the polarization self-rotation effect. Our previous experiments showed that the amount of observed squeezing may be limited by the contamination of the squeezed vacuum output with higher-order spatial modes, also generated inside the cell. Here, we demonstrate that the squeezing can be improved by making the light interact several times with a less dense atomic ensemble. With optimization of some parameters we can achieve up to -2.6 dB of squeezing in the multi-pass case, which is 0.6 dB improvement compared to the single-pass experimental configuration. Our results show that other than the optical depth of the medium, the spatial mode structure and cell configuration also affect the squeezing level.
Comments: 7 pages, 8 figures
Subjects: Atomic Physics (physics.atom-ph); Quantum Physics (quant-ph)
Cite as: arXiv:1705.02914 [physics.atom-ph]

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