AI Article Synopsis
- Entangled qudits, which are advanced quantum states, are crucial for quantum information research, but creating them efficiently is still a challenge.
- The authors present a new technique for generating frequency entangled qudits using spontaneous parametric downconversion, leveraging an angle-dependent phase-matching in a nonlinear crystal.
- The method involves spatially splitting the pump beam into discrete bins to create high-dimensional frequency modes, and the authors successfully demonstrate this by producing a three-dimensional entangled state with a custom slit mask.
Article 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.
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| http://dx.doi.org/10.1364/OL.487300 | DOI Listing |
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