Fully guided and phase locked Ti:PPLN waveguide squeezing for applications in quantum sensing

This work reports a fully guided setup for single-mode squeezing 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; 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 the effect of photorefraction on the cavity resonance condition suggests that it causes system instabilities at high powers. (c) 2023 Optica Publishing Group

Automated summary

This study presents a guided setup for single-mode squeezing on integrated titanium-indiffused periodically poled nonlinear resonators. By using single-mode fibers, a continuous-wave laser beam is delivered and the squeezed field is collected, with up to -3.17(9) dB of useful squeezing available in fibers. The generated squeezed light was applied in a fiber-based phase sensing experiment, showing a quantum enhancement in the signal-to-noise ratio of 0.35 dB. The investigation also reveals that photorefraction can cause system instabilities at high powers.