Spatial-spectral mapping to prepare the frequency entangled qudits
Abstract
Entangled qudits, the high-dimensional entangled states, play an important role in the study of quantum information. How to prepare entangled qudits in an efficient and easy-to-operate manner is still a challenge in quantum technology. Here, we demonstrate a method to engineer frequency entangled qudits in a spontaneous parametric downconversion process. The proposal employs an angle-dependent phase-matching condition in a nonlinear crystal, which forms a classical-quantum mapping between the spatial (pump) and spectral (biphotons) degrees of freedom. In particular, the pump profile is separated into several bins in the spatial domain, and thus shapes the down-converted biphotons into discrete frequency modes in the joint spectral space. Our approach provides a feasible and efficient method to prepare a high-dimensional frequency entangled state. As an experimental demonstration, we generate a three-dimensional entangled state by using a homemade variable slit mask.
Keywords
Cite
@article{arxiv.2307.08583,
title = {Spatial-spectral mapping to prepare the frequency entangled qudits},
author = {Zi-Xiang Yang and Zi-Qi Zeng and Ying Tian and Shun Wang and Ryosuke Shimizu and Hao-Yu Wu and Shilong Liu and Rui-Bo Jin},
journal= {arXiv preprint arXiv:2307.08583},
year = {2023}
}
Comments
9 pages, 9 figures