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

Abstract

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.

arXiv comment7 pages, 8 figures

References in corpus (18)

• The Quantum Internet
• Long-distance quantum communication with atomic ensembles and linear optics
• Quantum interface between light and atomic ensembles
• Quantum memories: emerging applications and recent advances
• Quantum noise limited and entanglement-assisted magnetometry
• Squeezed-Light Optical Magnetometry
• Generation of spatially broadband twin beams for quantum imaging
• Experimental Vacuum Squeezing in Rubidium Vapor via Self-Rotation
• Vacuum Squeezing in Atomic Media via Self-Rotation
• Quantum Enhanced Magnetometer with Low-Frequency Squeezing
• Low-frequency vacuum squeezing via polarization self-rotation in Rb vapor
• Polarization squeezing of light by single passage through an atomic vapor
• Generation of pulsed and continuous-wave squeezed light with ${}^{87}$Rb vapor
• Single mode quadrature entangled light from room temperature atomic vapour
• Vacuum squeezing via polarization self-rotation and excess noise in hot Rb vapors
• Spatial Multi-Mode Structure of Atom-Generated Squeezed Light
• Extracting Spatial Information from Noise Measurements of Multi-Spatial-Mode Quantum States
• Generating squeezed vacuum field with non-zero orbital angular momentum with atomic ensembles

Cited by in corpus (6)

• Spiral bandwidth of four-wave mixing in Rb vapour
• Polarization squeezing at the audio frequency band for the Rubidium D1 line
• Hybrid entanglement between optical discrete polarizations and continuous quadrature variables
• Low-Light Shadow Imaging using Quantum-Noise Detection with a Camera
• Quantized Nonlinear Gaussian-Beam Dynamics $-$ Tailoring Multimode Squeezed-Light Generation
• Quantum fluctuations spatial mode profiler