Ultra-broadband quadrature squeezing with thin-film lithium niobate nanophotonics

TL;DR

This paper demonstrates the generation of broadband quadrature squeezed light using thin-film lithium niobate nanophotonics, achieving significant squeezing and wide spectral bandwidth, advancing integrated quantum photonics.

Contribution

It introduces a scalable, integrated platform for generating broadband squeezed light via ferroelectric domain engineering in thin-film lithium niobate.

Findings

Achieved 0.56 dB quadrature squeezing on-chip

Generated squeezed light with up to 7 THz bandwidth

Demonstrated efficient single-pass nonlinear process

Abstract

Squeezed light is a key quantum resource that enables quantum advantages for sensing, networking, and computing applications. The scalable generation and manipulation of squeezed light with integrated platforms are highly desired for the development of quantum technology with continuous variables. In this letter, we demonstrate squeezed light generation with thin-film lithium niobate integrated photonics. Para-metric down-conversion is realized with quasi-phase matching using ferroelectric domain engineering. With sub-wavelength mode confinement, efficient nonlinear processes can be observed with single-pass configuration. We measure0.56+-0.09dB quadrature squeezing(~3 dB inferred on-chip). The single-pass configuration further enables the generation of squeezed light with large spectral bandwidth up to 7 THz. This work represents a significant step towards the on-chip implementation of continuous-variable quantum information processing