2026-10-12T22:22:17Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34033662 2026-09-30T16:01:15Z category_37476 portal_1023 item_type_12 month_year_09_2026

Generating Vector-Vortex $γ$ Photons by Nonlinear Compton Scattering Yong-Zheng Ren (25144800) Mamutjan Ababekri (14410179) Jun-Lin Zhou (594662) Feng Wan (565437) Qian Zhao (217607) Zhong-Peng Li (19346245) Kun Xue (2965698) Ya-Qing Huang (10030715) Zhao-Hui Chen (396863) Zhong-Feng Xu (14410188) Jian-Xing Li (12335938) Physics (arXiv) physics.optics (arXiv) hep-ph (arXiv) quant-ph (arXiv) Vector-vortex photons, characterized by a nonseparable coupling between polarization and orbital angular momentum (OAM), offer opportunities for optical manipulation, quantum communication, nuclear photonics, etc. However, their generation in the $γ$-ray regime remains challenging. Here, we put forward a novel method to generate vector-vortex $γ$ photons via nonlinear Compton scattering in elliptically polarized laser pulses. We reveal that tailoring laser ellipticity directs the multiphoton absorption to coherently populate OAM modes with opposite winding numbers, $\pm \ell$, tied to orthogonal circular polarizations, producing nonseparable spin-OAM photon states. For a linearly polarized laser of moderate intensity (dimensionless amplitude $a_0 \sim 1$), the mode-pair concurrence--a 0-to-1 measure of spin-OAM entanglement--reaches unity for MeV $γ$ photons, realizing maximally nonseparable radial- or azimuthal-type vector-vortex states. The laser amplitude further controls the accessible OAM spectrum. Our method offers a route to MeV vector-vortex photons, opening a new avenue for nuclear-scale structured photonics and high-energy quantum information. 2026-09-28T00:00:00Z Text Preprint 10.48550/arXiv.2609.35208 https://figshare.com/articles/preprint/Generating_Vector-Vortex_Photons_by_Nonlinear_Compton_Scattering/34033662 CC0