Logical rotation of non-separable states via uniformly self-assembled chiral superstructures

Yi-Heng Zhang, Si-Jia Liu, Peng Chen (), Dong Zhu, Wen Chen, Shi-Jun Ge, Yu Wang, Zhi-Feng Zhang and Yan-Qing Lu ()
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Yi-Heng Zhang: Nanjing University
Si-Jia Liu: Nanjing University
Peng Chen: Nanjing University
Dong Zhu: Nanjing University
Wen Chen: Nanjing University
Shi-Jun Ge: Nanjing University
Yu Wang: Nanjing University
Zhi-Feng Zhang: Nanjing University
Yan-Qing Lu: Nanjing University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract The next generation of high-capacity, multi-task optical informatics requires sophisticated manipulation of multiple degrees of freedom (DoFs) of light, especially when they are coupled in a non-separable way. Vector beam, as a typical non-separable state between the spin and orbital angular momentum DoFs, mathematically akin to entangled qubits, has inspired multifarious theories and applications in both quantum and classical regimes. Although qubit rotation is a vital and ubiquitous operation in quantum informatics, its classical analogue is rarely studied. Here, we demonstrate the logical rotation of vectorial non-separable states via the uniform self-assembled chiral superstructures, with favorable controllability, high compactness and exemption from formidable alignment. Photonic band engineering of such 1D chiral photonic crystal renders the incident-angle-dependent evolution of the spatially-variant polarizations. The logical rotation angle of a non-separable state can be tuned in a wide range over 4π by this single homogeneous device, flexibly providing a set of distinguished logic gates. Potential applications, including angular motion tracking and proof-of-principle logic network, are demonstrated by specific configuration. This work brings important insight into soft matter photonics and present an elegant strategy to harness high-dimensional photonic states.

Date: 2024
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DOI: 10.1038/s41467-024-45299-8

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