Spatial-spectral mapping to prepare the frequency entangled qudits
arXiv:2307.08583 · doi:10.1364/OL.487300
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.
9 pages, 9 figures
References in corpus (5)
- Heralded Generation of Ultrafast Single Photons in Pure Quantum States
- High-dimensional frequency-bin entangled photons in an optical microresonator on a chip
- On-demand harnessing of photonic soliton molecules
- Quantum frequency combs and Hong-Ou-Mandel interferometry: the role of spectral phase coherence
- Design of mid-infrared entangled photon sources using lithium niobate