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Due to its simple level structure, helium 4 is particularly attractive to investigate original scenario for nonlinear light-atom interaction. We illustrate this feature by two examples: i) the demonstration of an original CPT-enhanced phase sensitive amplifier for light, which has been used to generate a squeezed vacuum and, ii) the originality of spin noise spectroscopy in metastable helium 4.
Fabien Bretenaker,Fabienne Goldfarb,Shikang Liu,Pascal Neveu, andEtienne Brion
"Quantum optics in a metastable helium vapor", Proc. SPIE PC12016, Optical and Quantum Sensing and Precision Metrology II, PC1201634 (9 March 2022); https://doi.org/10.1117/12.2616988
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Fabien Bretenaker, Fabienne Goldfarb, Shikang Liu, Pascal Neveu, Etienne Brion, "Quantum optics in a metastable helium vapor," Proc. SPIE PC12016, Optical and Quantum Sensing and Precision Metrology II, PC1201634 (9 March 2022); https://doi.org/10.1117/12.2616988