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  • Open Access

Entanglement and pair production in intense electromagnetic fields

S. Tang1, B. Dillon2, and B. King3,*

  • *Contact author: b.king@plymouth.ac.uk
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Phys. Rev. D 112, 056032 – Published 26 September, 2025

DOI: https://doi.org/10.1103/9br2-tj4t

Abstract

We investigate the spin correlations between electron-positron pairs created from a photon when it scatters in a high-intensity laser pulse via the nonlinear Breit-Wheeler process. We find that the spin states of the generated electron-positron pair can exhibit strong entanglement, with the degree being sensitive to the photon energy, laser intensity, and the relative polarization of the photon and laser pulse. Photons with a high degree of polarization can create strongly entangled pairs even in the intermediate intensity (nonperturbative) regime. We find that if the photons are provided by a Compton source, strongly spin-entangled electron-positron pairs can be generated with technology available today.

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Phys. Rev. D 112, 056032– Published 26 September, 2025
  • Received 16 April 2025
  • Accepted 3 September 2025
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