This work reports a fully guided setup for single-mode squeezing generation on integrated titanium-indiffused periodically poled nonlinear resonators. A continuous wave laser beam is delivered and the squeezed field is collected by single-mode fibers, where up to -3.17(9) dB of useful squeezing is available in fibers. To showcase the usefulness of such a fiber-coupled device, we applied the generated squeezed light in a fiber-based phase sensing experiment, showing a quantum enhancement in the signal-to-noise ratio of 0.35 dB. Moreover, our investigation of photorefraction's impact on the cavity resonance condition suggests that it causes system instabilities at high powers.
@article{arxiv.2306.04767,
title = {Fully guided and phase locked Ti:PPLN waveguide squeezing for applications in quantum sensing},
author = {Renato Domeneguetti and Michael Stefszky and Harald Herrmann and Christine Silberhorn and Ulrik L. Andersen and Jonas S. Neergaard-Nielsen and Tobias Gehring},
journal= {arXiv preprint arXiv:2306.04767},
year = {2023}
}