ArticleScience advances2025
Ultracompact 3D integrated photonic chip for high-fidelity high-dimensional quantum gates.
Article in Science advances, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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8 authors.
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Abstract
Spatial modes of photons offer a rich encoding resource for high-dimensional quantum information processing. Multiplane light conversion (MPLC) enables spatial mode transformation and is applicable in both classical and quantum optics. Here, we demonstrate a polymer-based MPLC device, fabricated via femtosecond laser three-dimensional printing, that realizes high-dimensional quantum logic gates in an ultracompact format. Specifically, we design a three-dimensional Hadamard gate by training a diffractive neural network to generate the required phase distribution. The device is evaluated through quantum process tomography at the single-photon level within spatial modes, achieving a fidelity of 90%. Compared to traditional spatial light modulator-based implementations, our approach integrates spatial mode manipulation into a miniaturized photonic platform. These results highlight the feasibility of polymer-based MPLC for compact quantum logic and open possibilities for scalable, high-dimensional quantum information processing on integrated photonic chips.
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