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arXiv · 2608.15859

Anomalous radiation pressure in strong-field ionization driven by quantum light

Xiaodan Mao·Feng He·Pei-Lun He
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Abstract

We show that in strong-field ionization driven by bright squeezed vacuum, the mean longitudinal photoelectron momentum scales with the mean incident intensity $I$ as $I^{2/3}$, rather than linearly as under coherent-light driving. This anomalous scaling originates from a field-amplitude saddle-point structure: nonlinear tunneling selects two dominant field amplitudes of equal magnitude and opposite sign from the broad quantum fluctuations. Tracing over the final photon state erases their relative-phase information, leaving their common magnitude to determine the field-dependent longitudinal momentum shift and its $I^{2/3}$ scaling. Photon-number resolution instead preserves this coherence, producing parity-dependent modulations of the longitudinal momentum transfer through time-domain double-slit interference between two field pathways separated by half a cycle. These results establish longitudinal momentum transfer as a distinct observable in strong-field quantum optics that encodes both the photon statistics and the field coherence of intense quantum light.

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Xiaodan Mao, Feng He, Pei-Lun He. 2026-08-16. Anomalous radiation pressure in strong-field ionization driven by quantum light. https://arxiv.org/abs/2608.15859

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