Correlated two-photon emission by transitions of Dirac-Volkov states in intense laser fields: QED predictions

Erik Lötstedt, Ulrich D. Jentschura

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In an intense laser field, an electron may decay by emitting a pair of photons. The two photons emitted during the process, which can be interpreted as a laser-dressed double Compton scattering, remain entangled in a quantifiable way: namely, the so-called concurrence of the photon polarizations gives a gauge-invariant measure of the correlation of the hard gamma rays. We calculate the differential rate and concurrence for a backscattering setup of the electron and photon beam, employing Volkov states and propagators for the electron lines, thus accounting nonperturbatively for the electron-laser interaction. The nonperturbative results are shown to differ significantly compared to those obtained from the usual double Compton scattering.

Original languageEnglish
Article number053419
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number5
Publication statusPublished - Nov 20 2009


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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