超快电子动力学中的光子统计力
Photon-statistics force in ultrafast electron dynamics
AI总结：
该研究将强场近似理论扩展为量子强场近似（qSFA），揭示驱动光的量子态会通过光子统计力影响高次谐波产生中的电子轨迹与阿秒脉冲，从而在阿秒科学与量子光学之间建立直接联系。
摘要：
在强场物理与阿秒科学中，强光会诱导超快电子动力学。物质中电子的这种超快动力学是高次谐波产生（HHG）等现象的核心，在这些现象中，此类动力学导致发射具有阿秒持续时间的极紫外脉冲。迄今为止，物质的所有超快动力学都被理解为完全源于驱动光的经典矢势，而忽略了光的量子性质的影响。在此我们表明，由明亮（强）光驱动的物质动力学显著依赖于驱动光的量子态，后者会诱导一种有效的光子统计力。为了给这种力的分析与控制提供统一框架，我们扩展了强场近似（SFA）理论，以计入非经典驱动光。我们的量子SFA（qSFA）理论表明，在HHG中，实验上可行的驱动光压缩可以在数百阿秒的尺度上移动并塑造电子轨迹和阿秒脉冲。我们的工作通过依赖非经典电磁场，为阿秒光谱学提供了一个新的自由度，并且更一般地，在阿秒科学与量子光学之间建立了直接联系。
英文摘要：
In strong-field physics and attosecond science, intense light induces ultrafast electron dynamics. Such ultrafast dynamics of electrons in matter is at the core of phenomena such as high harmonic generation (HHG), where these dynamics lead to emission of extreme UV bursts with attosecond duration. So far, all ultrafast dynamics of matter were understood to originate purely from the classical vector potential of the driving light, disregarding the influence of the quantum nature of light. Here we show that dynamics of matter driven by bright (intense) light significantly depend on the quantum state of the driving light, which induces an effective photon-statistics force. To provide a unified framework for the analysis & control over such a force, we extend the strong-field approximation (SFA) theory to account for non-classical driving light. Our quantum SFA (qSFA) theory shows that in HHG, experimentally feasible squeezing of the driving light can shift & shape electronic trajectories and attosecond pulses at the scale of hundreds of attoseconds. Our work presents a new degree-of-freedom for attosecond spectroscopy, by relying on nonclassical electromagnetic fields, and more generally, introduces a direct connection between attosecond science and quantum optics.
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