Integrated squeezed light sources for two-mode entanglement in thin-film lithium niobate
Abstract
Scalable generation of nonclassical light sources on an integrated platform is a key requirement for photonic quantum information processing. In particular, realizing multiple indistinguishable squeezed light sources on a single chip is an essential step toward continuous-variable quantum computing. Here, we demonstrate the fabrication of two indistinguishable and independently controllable optical parametric oscillators on a thin-film lithium niobate (TFLN) platform. The device design focuses on reproducibility, independent tunability, and compatibility with larger telecom-wavelength continuous-variable photonic circuits. We observe up to 0.5 dB of directly measured squeezing below the shot-noise level from each source. By interfering the two modes on a beam splitter, we generate an EPR-type two-mode squeezed state and verify continuous-variable entanglement through violation of the Duan-Simon inseparability criterion. This is the first demonstration of two independently tunable squeezed-light sources on a single TFLN chip and their use for generating continuous-variable entanglement.
Keywords
Cite
@article{arxiv.2605.26583,
title = {Integrated squeezed light sources for two-mode entanglement in thin-film lithium niobate},
author = {Philipp Lohmann and Renato R. Domeneguetti and Daniel Wendland and Alessandro Perino and Tobias Egebjerg and Liam McRae and Jonas S. Neergaard-Nielsen and Wolfram H. P. Pernice and Ulrik L. Andersen},
journal= {arXiv preprint arXiv:2605.26583},
year = {2026}
}