Multimode single-pass spatio-temporal squeezing
La Volpe, L. (Luca), De, S. (Syamsundar), Kouadou, T. (Tiphaine), Horoshko, D. (Dmitri), Kolobov, M. (Mikhail), Fabre, C. (Claude), Parigi, V. (Valentina), Treps, N. (Nicolas) · LillOA (Université de Lille (University Of Lille)) · 2020
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 spatio-temporal 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.