Emergence of nonclassical radiation in strongly laser-driven quantum systems
- 1Friedrich Schiller University Jena
- 2Fraunhofer Institute for Applied Optics and Precision Engineering
Abstract
We present an analytical framework for the emergence of nonclassical radiation in strongly laser-driven quantum systems, with a focus on high-order harmonic generation (HHG). Starting from a Pauli–Fierz description, we employ a parametric factorization of the coupled light–matter wavefunction that reduces the dynamics to coupled equations for a field-driven electronic state and a quantized light mode. Within this framework, we identify a simple and predictive mechanism for nonclassicality: it originates from the nonlinear dependence of the electronic dipole response on the light-mode coordinate. An approximately constant dipole yields coherent radiation, a linear dependence produces squeezing, and higher-order nonlinearities give rise to Wigner-function negativity. We illustrate this mechanism for atomic and molecular model systems and analyze its scaling in multi-emitter configurations, indicating routes toward high-photon-number nonclassical radiation in HHG. Our results provide a transparent connection between strong-field dynamics and quantum-optical properties of emitted light, offering a basis for engineering nonclassical states in intense laser–matter interactions.
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BibTeX
@article{gonoskov2026emergence,
title = {{Emergence of nonclassical radiation in strongly laser-driven quantum systems}},
author = {Ivan Gonoskov and Christian Hünecke and Stefanie Gräfe},
journal = {New Journal of Physics},
year = {2026},
month = oct,
doi = {10.1088/1367-2630/aeae67},
url = {https://iopscience.iop.org/article/10.1088/1367-2630/aeae67},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Emergence of nonclassical radiation in strongly laser-driven quantum systems
AU - Ivan Gonoskov
AU - Christian Hünecke
AU - Stefanie Gräfe
PY - 2026
DA - 2026/10/15
JO - New Journal of Physics
DO - 10.1088/1367-2630/aeae67
UR - https://iopscience.iop.org/article/10.1088/1367-2630/aeae67
AB - We present an analytical framework for the emergence of nonclassical radiation in strongly laser-driven quantum systems, with a focus on high-order harmonic generation (HHG). Starting from a Pauli–Fierz description, we employ a parametric factorization of the coupled light–matter wavefunction that reduces the dynamics to coupled equations for a field-driven electronic state and a quantized light mode. Within this framework, we identify a simple and predictive mechanism for nonclassicality: it originates from the nonlinear dependence of the electronic dipole response on the light-mode coordinate. An approximately constant dipole yields coherent radiation, a linear dependence produces squeezing, and higher-order nonlinearities give rise to Wigner-function negativity. We illustrate this mechanism for atomic and molecular model systems and analyze its scaling in multi-emitter configurations, indicating routes toward high-photon-number nonclassical radiation in HHG. Our results provide a transparent connection between strong-field dynamics and quantum-optical properties of emitted light, offering a basis for engineering nonclassical states in intense laser–matter interactions.
SN - 1367-2630
ER -