Intermodal entanglement in a quantum optical model of HHG due to the back-action on the driving field

• URL: http://arxiv.org/abs/2603.01315v1
• Date: Sun, 01 Mar 2026 23:05:05 GMT
• Title: Intermodal entanglement in a quantum optical model of HHG due to the back-action on the driving field
• Authors: Ákos Gombkötő, Péter Ádám, David Theidel, Tamás Kiss,
• Abstract summary: Preparation of nonclassical light with special quantum properties is essential for quantum technologies.<n>In this work, we theoretically investigate entanglement between different harmonics within an effective quantum optical model.<n>We find that entanglement is produced as a result of the often neglected back-action.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Preparation of nonclassical light with special quantum properties is essential for quantum technologies. High-harmonic generation (HHG) is a process which not only enables the creation of attosecond pulses but also has the potential to generate light with intricate quantum properties. In a recent experiment [1], nonclassical inter-harmonic correlations have been measured from a HHG source. In this work, we theoretically investigate entanglement between different harmonics within an effective quantum optical model. This model implements a signifcant degree of simplifcation regarding the processes within the target material, treating the material through susceptibilities, as it is usual in quantum optics. Such an approach yields a general description of HHG, permitting the implications that can be derived within it to hold broadly. We find that entanglement is produced as a result of the often neglected back-action. We can qualitatively reproduce experimentally measured nonclassicalities, which suggests that intermodal entanglement can, to an extent, be considered a universal phenomenon associated with HHG, rather than a result of using specific material targets.

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