Demonstration of a Squeezed Light Source on Thin-Film Lithium Niobate with Modal Phase Matching

TL;DR

This paper demonstrates a compact, integrated squeezed light source on thin-film lithium niobate with measurable noise reduction, highlighting its potential for scalable quantum information processing.

Contribution

It presents the first demonstration of a squeezed light source on TFLN using modal phase matching, simplifying design and fabrication compared to previous methods.

Findings

Achieved 0.46 dB shot noise reduction.

Used modal phase matching and grating couplers with -2.2 dB efficiency.

Comparable squeezing performance to more complex circuitry.

Abstract

Squeezed states are essential for continuous variable (CV) quantum information processing, with wide-ranging applications in computing, sensing and communications. Integrated photonic circuits provide a scalable, convenient platform for building large CV circuits. Thin-film Lithium Niobate (TFLN) is particularly promising due to its low propagation loss, efficient parametric down conversion, and fast electro-optical modulation. In this work, we demonstrate a squeezed light source on an integrated TFLN platform, achieving a measured shot noise reduction of 0.46 dB using modal phase matching and grating couplers with an efficiency of up to -2.2 dB. The achieved squeezing is comparable to what has been observed using more complex circuitry based on periodic poling. The simpler design allows for compact, efficient and reproducible sources of squeezed light.