Work

Singly poled thin film lithium niobate waveguide as a tunable source of photon pairs across telecom band

Year: 2025

Type: article

Abstract: Spontaneous parametric down-conversion (SPDC), especially in non-linear waveguides, serves as an important process to generate quantum states of light with desired properties. In this work, we report on a design of a strongly dispersive, singly poled thin film lithium niobate (TFLN) waveguide geometry which acts as a convertible source of photon pairs across telecom band with tunable spectral properties. Through our simulations, we demonstrate that by using this optimized waveguide geometry, two completely different yet desirable type II phase-matched SPDC processes are enabled using a single poling period. One process generates spectrally correlated non-degenerate photon pairs with one photon at 1310nm (telecom O band) and the other at 1550nm (telecom C band). The second SPDC process results in spectrally uncorrelated photon pairs in telecom C band at 1533nm and 1567nm respectively.We attribute this versatility of TFLN waveguide to its strong dispersion properties and make a comparative study with the existing weakly dispersive waveguide platforms.We believe that such a versatile source of photon pairs will serve as an important ingredient in various quantum optical tasks which require photons at different telecom bands and desired spectral properties.

Source: Physica Scripta

DOI: 10.1088/1402-4896/add054

Authors: Muskan Arora, Jyoti Arya, Pranav Chokkara, Jasleen Lugani

Institution: Indian Institute of Technology Delhi

Language: English

Topic: Photorefractive and Nonlinear Optics

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Ministry of Education, India, Science and Engineering Research Board, Division of Human Resource Development

Award: G7002372916