Unravelling inter-channel quantum interference in below-threshold nonsequential double ionization with statistical measures

• URL: http://arxiv.org/abs/2510.16135v1
• Date: Fri, 17 Oct 2025 18:21:54 GMT
• Title: Unravelling inter-channel quantum interference in below-threshold nonsequential double ionization with statistical measures
• Authors: S. Hashim, C. Figueira de Morisson Faria,
• Abstract summary: Interchannel quantum interference is studied in laser-collision nonsequential double ionization (Ninduced)<n>We quantify the interplay between channels resulting from a vast number of interfering processes.<n>Our findings establish a hierarchy of interference mechanisms in RESI and may provide practical guidelines for enhancing or suppressing interference in different regions of the momentum plane.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: We present a systematic study of interchannel quantum interference in laser-induced nonsequential double ionization (NSDI) within the strong-field approximation. Focusing on the below-threshold intensity regime where the recollision-excitation with subsequent ionization (RESI) pathway dominates, we derive analytical phase conditions governing interference between distinct excitation channels for arbitrary driving fields. To quantify the interplay between channels resulting from a vast number of interfering processes, we introduce statistical metrics based on the Earth Mover's Distance, allowing us to assess the relative weight of each channel's contribution to the two-electron photoelectron momentum distributions (PMDs). We identify key factors that determine whether interchannel interference is appreciable such as comparable channel intensities, strong spatial overlap between the excited-state wavefunctions and the energy difference between contributing channels. We demonstrate that for linearly polarized few-cycle pulses, the typical intrachannel interference features associated with exchange, temporal shifts and combined exchange-temporal interference are retained with interchannel interference. Our findings establish a hierarchy of interference mechanisms in RESI and may provide practical guidelines for enhancing or suppressing interference in different regions of the momentum plane.

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