A field-quadrature perspective on strong-field ionization with squeezed light
- 1Graduate School, China Academy of Engineering Physics
- 2Institute of Atomic and Molecular Physics, Jilin University
Abstract
Bright squeezed vacuum (BSV) has emerged as a macroscopic nonclassical light source capable of driving strong-field processes. Yet its broad, long-tailed photon-number distribution bears little resemblance to the narrow poissonian distribution of a coherent field, obscuring how the corresponding strong-field responses are connected. We show that field-quadrature space supplies the missing continuous description: coherent, squeezed coherent, and BSV states are Gaussian wave packets distinguished only by their centers and widths. This representation provides a unified framework for tracing the coherent-to-BSV transition at fixed mean photon number and for analyzing both ionization yields and photoelectron spectra. Crucially, BSV is a symmetry-protected endpoint in quadrature space. Near the BSV limit, we identify a simple scaling law of the ionization response associated with a residual coherent component. We show that this scaling arises from parity-induced stationarity with respect to the Gaussian center, together with the accompanying width variation near the BSV limit. The result provides a symmetry-based criterion for approaching the BSV regime and a potential probe of a mode-matched coherent displacement through the strong-field response itself.
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BibTeX
@article{liu2026fieldquadrature,
title = {{A field-quadrature perspective on strong-field ionization with squeezed light}},
author = {Haoyu Liu and Jianmin Yuan and Xu Wang},
journal = {New Journal of Physics},
year = {2026},
month = oct,
doi = {10.1088/1367-2630/aeb154},
url = {https://iopscience.iop.org/article/10.1088/1367-2630/aeb154},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - A field-quadrature perspective on strong-field ionization with squeezed light
AU - Haoyu Liu
AU - Jianmin Yuan
AU - Xu Wang
PY - 2026
DA - 2026/10/23
JO - New Journal of Physics
DO - 10.1088/1367-2630/aeb154
UR - https://iopscience.iop.org/article/10.1088/1367-2630/aeb154
AB - Bright squeezed vacuum (BSV) has emerged as a macroscopic nonclassical light source capable of driving strong-field processes. Yet its broad, long-tailed photon-number distribution bears little resemblance to the narrow poissonian distribution of a coherent field, obscuring how the corresponding strong-field responses are connected. We show that field-quadrature space supplies the missing continuous description: coherent, squeezed coherent, and BSV states are Gaussian wave packets distinguished only by their centers and widths. This representation provides a unified framework for tracing the coherent-to-BSV transition at fixed mean photon number and for analyzing both ionization yields and photoelectron spectra. Crucially, BSV is a symmetry-protected endpoint in quadrature space. Near the BSV limit, we identify a simple scaling law of the ionization response associated with a residual coherent component. We show that this scaling arises from parity-induced stationarity with respect to the Gaussian center, together with the accompanying width variation near the BSV limit. The result provides a symmetry-based criterion for approaching the BSV regime and a potential probe of a mode-matched coherent displacement through the strong-field response itself.
SN - 1367-2630
ER -