High Purity OAM Entangled Photons from SPDC with Reduced Spatial Spectral Correlations

• URL: http://arxiv.org/abs/2603.04578v1
• Date: Wed, 04 Mar 2026 20:17:06 GMT
• Title: High Purity OAM Entangled Photons from SPDC with Reduced Spatial Spectral Correlations
• Authors: F. Crislane V. de Brito, Sylwia Kolenderska, Piotr Kolenderski,
• Abstract summary: Entanglement generated by Spontaneous Parametric Down Conversion (SPDC) involves multiple, often mutually correlated degrees of freedom.<n>We focus on the spatial spectral correlations that, if left, introduce distinguishability and reduce coherence, undermining applications such as high-dimensional OAM encoding.<n>We then quantify how spatial spectral couplings OAM spatial purity, mapping high-purity regions as functions of OAM order, crystal length, and pump/collection waists.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Entanglement generated by Spontaneous Parametric Down Conversion (SPDC) involves multiple, often mutually correlated degrees of freedom. These degrees of freedom are often treated independently, overlooking the intrinsic correlation between them. We focus on the spatial spectral correlations that, if left uncontrolled, introduce distinguishability and reduce coherence, undermining applications such as high-dimensional OAM encoding. We analyze the spatio spectral structure of the biphoton and identify source configurations enabling a strong reduction of such correlations. We then quantify how spatial spectral coupling degrades OAM spatial purity, mapping high-purity regions as functions of OAM order, crystal length, and pump/collection waists. The resulting design parameters enable engineering bright, high purity OAM entangled sources, reducing the need for loss-introducing filtering and therefore supporting scalable high-dimensional photonic quantum technologies.

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