发表机构
Xi’an Jiaotong University（西安交通大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
提出利用椭圆偏振激光脉冲中的非线性康普顿散射产生MeV矢量涡旋γ光子，通过调控激光椭圆率实现自旋-OAM不可分离态，为核尺度结构光子学与高能量子信息开辟新途径。
AI 中文摘要
矢量涡旋光子具有偏振与轨道角动量（OAM）之间不可分离的耦合特征，为光学操控、量子通信、核光子学等提供了机遇。然而，在γ射线波段产生此类光子仍具挑战性。本文提出一种新颖方法，利用椭圆偏振激光脉冲中的非线性康普顿散射产生矢量涡旋γ光子。我们揭示，调控激光椭圆率可引导多光子吸收，使OAM模式以相反绕数±ℓ相干布居，并与正交圆偏振相关联，从而产生不可分离的自旋-OAM光子态。对于中等强度（无量纲振幅a₀~1）的线偏振激光，模式对并发度（衡量自旋-OAM纠缠的0到1指标）在MeVγ光子下达到1，实现最大不可分离的径向或方位型矢量涡旋态。激光振幅进一步控制可访问的OAM谱。我们的方法为产生MeV矢量涡旋光子提供了途径，为核尺度结构光子学和高能量子信息开辟了新方向。
英文摘要
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.
Comments8 pages, 5 figures
