Work

Tailoring orbital angular momentum entanglement through inverse design based on gradient descent

Year: 2025

Type: article

Abstract: High-dimensional quantum entanglement is an important resource for fundamental research and quantum technological application. Recently, the orbital angular momentum (OAM) of light has received much attention to realize high-dimensional quantum systems, and generating and manipulating the OAM entanglement has become an important topic. Here, we propose an inverse design technique to manipulate the OAM entanglement of the photon pair generated through spontaneous parametric down-conversion. The proposed technique directly tailors the OAM states of entangled photon pairs by shaping the incident pump beam. In particular, we construct a physics-informed model by leveraging the backpropagation algorithm and adhering to the overlap integral relation. Our model automatically optimizes diffractive masks, allowing the structured pump to quantitatively modulate the OAM distribution. The generation of maximally entangled states in different dimensions is demonstrated numerically and experimentally.

Source: Optics & Laser Technology

DOI: 10.1016/j.optlastec.2025.113283

Authors: Youngbin Na, Do-Kyeong Ko

Institution: Gwangju Institute of Science and Technology

Language: English

Topic: Orbital Angular Momentum in Optics

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,230

Funders: Gwangju Institute of Science and Technology, National Research Foundation of Korea, Ministry of Science and ICT, South Korea