Quantum Information Processing with Spatially Structured Light

• URL: http://arxiv.org/abs/2510.11154v1
• Date: Mon, 13 Oct 2025 08:48:06 GMT
• Title: Quantum Information Processing with Spatially Structured Light
• Authors: Suraj Goel, Bohnishikha Ghosh, Mehul Malik,
• Abstract summary: We review advances in quantum optical circuits with spatially structured light.<n>We highlight circuits based on platforms such as multi-plane light conversion, complex scattering media, multimode and multi-core fibers.<n>We discuss their applications for the manipulation and measurement of multi-dimensional and multi-mode quantum states.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Qudits have proven to be a powerful resource for quantum information processing, offering enhanced channel capacities, improved robustness to noise, and highly efficient implementations of quantum algorithms. The encoding of photonic qudits in transverse-spatial degrees of freedom has emerged as a versatile tool for quantum information processing, allowing access to a vast information capacity within a single photon. In this review, we examine recent advances in quantum optical circuits with spatially structured light, focusing particularly on top-down approaches that employ complex mode-mixing transformations in free-space and fibers. In this context, we highlight circuits based on platforms such as multi-plane light conversion, complex scattering media, multimode and multi-core fibers. We discuss their applications for the manipulation and measurement of multi-dimensional and multi-mode quantum states. Furthermore, we discuss how these circuits have been employed to perform multi-party operations and multi-outcome measurements, thereby opening new avenues for scalable photonic quantum information processing.

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