Squeezed states of the optical field were theoretically described in the early 1970s and first observed in the mid 1980s. The measured photon number of a squeezed state is correlated with the measured photon numbers of all other squeezed states of the same ensemble, providing sub-Poissonian statistics. Today all gravitational-wave observatories use squeezed light as the cost-efficient alternative to further scaling up the light power. This user application of quantum correlations was made possible through dedicated research and development of squeezed light between 2002 and 2010.
@article{arxiv.2307.08394,
title = {The success story of squeezed light},
author = {Roman Schnabel},
journal= {arXiv preprint arXiv:2307.08394},
year = {2023}
}
Comments
Proceedings paper of the invited talk at the 56th Rencontres de Moriond 2022 on Gravitation in La Thuile, Aosta Valley, Italy, January 30 - February 6, 2022. https://moriond.in2p3.fr/download/proceedings_gravitation_2022new.pdf ; Full proceedings available at https://doi.org/10.58027/1e1n-7973