Single-pass generation of widely-tunable frequency-domain entangled photon pairs

TL;DR

This paper presents a novel single-pass method for generating widely-tunable, frequency-entangled photon pairs with high polarization purity, suitable for advanced quantum sensing, imaging, and processing applications.

Contribution

The authors introduce a single-pass, wide-tuning technique using a single nonlinear crystal to produce high-quality frequency-entangled photon pairs with polarization control.

Findings

Photon pairs exhibit non-degenerate Hong-Ou-Mandel interference

Method enables wide-range quantum sensing and imaging

High polarization definition of entangled photons

Abstract

We demonstrate a technique that generates frequency-entangled photon pairs with high polarization definition by using a single-period nonlinear crystal and single pass configuration. The technique is based on the simultaneous occurrence of two spontaneous parametric down-conversion processes satisfying independent type-II collinear pseudo-phase matching conditions in periodically poled stoichiometric lithium tantalate. The generated photon pairs exhibit non-degenerate Hong-Ou-Mandel interference, indicating the presence of quantum entanglement in the frequency domain. This method provides a light source capable of wide-range quantum sensing and quantum imaging or high-dimensional quantum processing.