Nonperturbative treatment of double compton backscattering in intense laser fields

Area of Science:

• Quantum Electrodynamics
• High-Intensity Laser Physics
• Relativistic Quantum Mechanics

Background:

• Electron interactions in intense laser fields are complex.
• Understanding entangled photon emission is crucial for quantum technologies.
• Previous models often used perturbative approaches.

Purpose of the Study:

• To describe entangled photon emission via two-photon transitions.
• To investigate nonperturbative effects using relativistic Dirac-Volkov states.
• To quantify photon polarization correlation and entanglement.

Main Methods:

• Modeling two-photon transitions of laser-dressed, relativistic Dirac-Volkov states.
• Analyzing the limit of small laser field intensity.
• Employing the concurrence measure for entanglement quantification.

Main Results:

• The two-photon transition amplitude converges to double Compton scattering at low laser intensity.
• Nonperturbative treatment significantly modifies theoretical predictions.
• Entanglement and polarization correlations were quantified using concurrence.

Conclusions:

• Relativistic Dirac-Volkov states provide a robust framework for high-intensity laser-electron interactions.
• Nonperturbative calculations are essential for accurate predictions in such regimes.
• The study offers a method to measure entanglement in photon emission experiments.