The present work theoretically investigates the probability of generation of entangled electron–photon pair in high-energy Compton scattering of unpolarized electrons and photons due to scattering-channel-exchange mechanism. The study suggests that the scattering of unpolarized electrons and photons with nearly equal energy of the order of MeV at cross-channel can create entangled pair of up-spin electron and RCP photon or down-spin electron and LCP photon. The entanglement is quite strong exhibiting jump-concurrence for particular directions of scattering, however not limited by the Kapitza–Dirac restriction. Such strong electron–photon entanglement is observed to be highly selective along the directions of scattering on the surface of two opposite cones at 45° around the electron-detector axis and on the plane perpendicular to it, the latter one exhibiting maximal entanglement. The work predicts that spin-polarization entangled electron–photon pairs are highly possible to be found in practical experiments of high-energy Compton scattering with specific directional selectivity.

本工作从理论上研究了由于散射通道交换机制而在非极化电子和光子的高能康普顿散射中产生纠缠的电子-光子对的可能性。研究表明，在交叉通道处具有几乎等量MeV能量的非极化电子和光子的散射会产生上旋电子和RCP光子或下旋电子和LCP光子的纠缠对。纠缠非常强，在特定的散射方向上表现出跳跃并发性，但是不受Kapitza–Dirac限制的限制。观察到这种强的电子-光子缠结在两个相对的圆锥体表面上围绕电子检测器轴和垂直于其的平面上以45°的散射方向具有很高的选择性，后者表现出最大的纠缠。这项工作预测，在具有特定方向选择性的高能康普顿散射的实际实验中，极有可能发现自旋极化纠缠的电子-光子对。