Open AccessGeneration of squeezed light vacuum enabled by coherent population trapping
Author(s) -
Pascal Neveu,
Joseph Delpy,
S Liu,
Chitram Banerjee,
Jasleen Lugani,
Fabien Bretenaker,
Étienne Brion,
Fabienne Goldfarb
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.419495
Subject(s) - physics , four wave mixing , squeezed coherent state , metastability , mixing (physics) , photon , population , quantum optics , trapping , optics , electromagnetically induced transparency , spontaneous emission , noise (video) , atomic physics , quantum mechanics , coherent states , nonlinear optics , laser , quantum , ecology , demography , artificial intelligence , sociology , computer science , image (mathematics) , biology
We demonstrate the possibility to generate squeezed vacuum states of light by four wave mixing (FWM) enabled coherent population trapping in a metastable helium cell at room temperature. Contrary to usual FWM far detuned schemes, we work at resonance with an atomic transition. We investigate the properties of such states and show that the noise variances of the squeezed and anti-squeezed quadratures cannot be explained by the simple presence of losses. A specific model allows us to demonstrate the role played by spontaneous emitted photons, which experience squeezing while propagation inside of the cell. This theoretical model, which takes into account both residual absorption and spontaneous emission, leads to an excellent agreement with the experimental data without any adjusted parameter.