Mi Zhang,
Melissa A. Guidry,
R. Nicholas Lanning,
Zhihao Xiao,
Jonathan P. Dowling,
Irina Novikova,
Eugeniy E. Mikhailov
(Submitted on 8 May 2017 (v1), last revised 10 May 2017 (this version, v2))
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) |
| Journal reference: | Phys. Rev. A 96, 013835 (2017) |
| DOI: | 10.1103/PhysRevA.96.013835 |
| Cite as: | arXiv:1705.02914 [physics.atom-ph] |
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