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Physics

Capturing the Path of a Light Pulse

Erika K. Carlson

Published Jan 8, 2021• 0 citations
Publisher
DOI
10.1103/physics.14.4

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Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text C. Otey, M. L. Povinelli, and S. Fan, "Capturing Light Pulses Completely Using a Few Dynamic Microcavities," in Slow and Fast Light, (Optica Publishing Group, 2008), paper STuB3. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

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The recently available high-intensity quantum light pulses provide novel tools for controlling light-matter interactions. However, the rigor of the theoretical frameworks currently used to describe the interaction of strong quantum light with atoms and molecules remains unverified. Here, we establish a rigorous benchmark by solving the fully quantized time-dependent Schrödinger equation for an atom exposed to bright squeezed vacuum light. Our \textit{ab initio} simulations reveal a critical limitation of the widely used QQQ-representation: although it accurately reproduces the total photoelectron spectrum after tracing over photon states, it completely fails to capture the electron-photon joint energy spectrum. To overcome this limitation, we develop a general theoretical framework based on the Feynman path integral that properly incorporates the electron-photon quantum entanglement. Our results provide both quantitative benchmarks and fundamental theoretical insights for the emerging field of strong-field quantum optics.