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

• URL: http://arxiv.org/abs/2608.15859v1
• Date: Sun, 16 Aug 2026 17:03:39 GMT
• Title: Anomalous radiation pressure in strong-field ionization driven by quantum light
• Abstract summary: 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 $I2/3$, rather than linearly as under coherent-light driving.<n>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.
• Score: 1.2374488894930669
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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