Squeezed states of light have received renewed attention due to their applicability to quantum-enhanced sensing. To take full advantage of their reduced noise properties to enhance atomic-based sensors, it is necessary to generate narrowband near or on atomic resonance single-mode squeezed states of light. We have previously generated bright two-mode squeezed states of light, or twin beams, that can be tuned to resonance with the D1 line of 87Rb with a non-degenerate four-wave mixing (FWM) process in a double-lambda configuration in a 85Rb vapor cell. Here we report on the use of feedforward to transfer the amplitude quantum correlations present in the twin beams to a single beam for the generation of single-mode amplitude squeezed light. With this technique we obtain a single-mode squeezed state with a squeezing level of −2.9±0.1 dB when it is tuned off-resonance and a level of −2.0±0.1 dB when it is tuned on resonance with the D1 F=2 to F′=2 transition of 87Rb.
@article{arxiv.1906.07666,
title = {Atomic Resonant Single-Mode Squeezed Light from Four-Wave Mixing through Feedforward},
author = {Saesun Kim and Alberto M. Marino},
journal= {arXiv preprint arXiv:1906.07666},
year = {2022}
}