标题： 光子在时空电磁场不均匀性上的量子反射 显示英文标题

标题： Quantum reflection of photons off spatio-temporal electromagnetic field inhomogeneities

摘要： 我们重新考虑了最近提出的非线性QED效应，即光子在不均匀强场区域的量子反射。 我们给出了在空间和时间上都变化的强场的新结果。 虽然这种配置可能产生新的效应，如频率混合，但基于先前一维研究的反射率估计得到了证实。 在概念层面，我们对传统局部常场近似的适用范围进行了批判性重新审视，并确定了可以可靠处理的运动学配置。 我们的结果进一步强调了量子反射作为量子真空非线性新特征的发现潜力。 显示英文摘要

摘要： We reconsider the recently proposed nonlinear QED effect of quantum reflection of photons off an inhomogeneous strong-field region. We present new results for strong fields varying both in space and time. While such configurations can give rise to new effects such as frequency mixing, estimated reflection rates based on previous one-dimensional studies are corroborated. On a conceptual level, we critically re-examine the validity regime of the conventional locally-constant-field approximation and identify kinematic configurations which can be treated reliably. Our results further underline the discovery potential of quantum reflection as a new signature of the nonlinearity of the quantum vacuum.