We present a single-pass source of broadband multimode squeezed light with potential application in quantum information and quantum metrology. The source is based on a type I parametric down-conversion (PDC) process inside a bulk nonlinear crystal in a non-collinear configuration. The generated squeezed light exhibits a spatiotemporal multimode behavior that is probed using a homodyne measurement with a local oscillator shaped both spatially and temporally. Finally we follow a covariance matrix based approach to reveal the distribution of the squeezing among several independent temporal and spatial modes. This unambiguously validates the multimode feature of our source.
@article{arxiv.2001.03972,
title = {Multimode Single-Pass Spatio-temporal Squeezing},
author = {Luca La Volpe and Syamsundar De and Tiphaine Kouadou and Dmitri Horoshko and Mikhail Kolobov and Claude Fabre and Valentina Parigi and Nicolas Treps},
journal= {arXiv preprint arXiv:2001.03972},
year = {2020}
}