Monday, July 31, 2017

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

Mi Zhang, Melissa A. Guidry, R. Nicholas Lanning, Zhihao Xiao, Jonathan P. Dowling, Irina Novikova, Eugeniy E. Mikhailov
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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