亮压缩真空驱动高次谐波产生中的高阶关联与超快维格纳负性
High-order correlations and ultrafast Wigner negativities in bright-squeezed-vacuum-driven high-harmonic generation
- Max Planck Institute for the Structure and Dynamics of Matter（马普固体与结构研究所）
- Guangdong Technion-Israel Institute of Technology（广东以色列理工学院）
- Technion–Israel Institute of Technology（以色列理工学院）
- Initiative for Computational Catalysis (ICC), Flatiron Institute（Flatiron研究所计算催化倡议）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究建立完全量子框架，求解亮压缩真空驱动两能级系统的多模动力学，发现谐波发射具有独特的高阶光子关联，并产生阿秒时间尺度演化的维格纳负性，为量子HHG实验提供预测与解释途径。
AI中文摘要：
高次谐波产生（HHG）是一种典型的强场过程，其中强光驱动物质以驱动频率的整数倍发射辐射。将HHG扩展到量子光学领域，为利用光的非经典态探测和控制强非线性光-物质相互作用提供了新的机会。然而，描述这一领域需要对相关的电子-光子动力学进行完全量子处理，这对于宽带、强压缩场而言在计算上具有挑战性。在此，我们在收敛的多模希尔伯特空间中求解了由亮压缩真空驱动的两能级系统的量子电动力学动力学。驱动场和发射的谐波都被完全量子化，光-物质相互作用以非微扰方式处理。这使得我们能够直接访问多模量子态及其高阶关联，超越了半经典采样或微扰描述。我们表明，与相干激发相比，压缩真空驱动产生的谐波发射具有性质上不同的二阶和三阶光子关联。此外，驱动发射体的反作用强烈重塑了入射的压缩场，产生了在阿秒时间尺度上演化的显著维格纳函数负性。我们的结果建立了一个用于宽带强场动力学与压缩光的完全量子框架，并为预测和解释量子HHG实验及其向更复杂发射体的扩展提供了途径。
英文摘要：
High-harmonic generation (HHG) is a prototypical strong-field process in which intense light drives matter to emit radiation at integer multiples of the driving frequency. Extending HHG into the quantum-optical regime offers new opportunities to probe and control strongly nonlinear light-matter interactions using nonclassical states of light. Yet describing this regime requires a fully quantum treatment of the correlated electron-photon dynamics, which becomes computationally challenging for broadband, strongly squeezed fields. Here we solve the quantum-electrodynamical dynamics of a two-level system driven by bright squeezed vacuum in a converged multimode Hilbert space. Both the driving field and emitted harmonics are fully quantized, with the light-matter interaction treated nonperturbatively. This enables direct access to the multimode quantum state and its higher-order correlations beyond semiclassical sampling or perturbative descriptions. We show that squeezed-vacuum driving produces harmonic emission with qualitatively distinct second- and third-order photon correlations compared with coherent excitation. Moreover, back-action from the driven emitter strongly reshapes the incident squeezed field, generating pronounced Wigner-function negativities that evolve on attosecond timescales. Our results establish a fully quantum framework for broadband strong-field dynamics with squeezed light and provide a route to predicting and interpreting quantum-HHG experiments and their extension to more complex emitters.
