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.
E. Lotstedt and U. D. Jentschura, "Correlated Two-Photon Emission by Transitions of Dirac-Volkov States in Intense Laser Fields: QED Predictions," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 80, no. 5, pp. 053419-1-053419-14, American Physical Society (APS), Nov 2009.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.80.053419
Keywords and Phrases
Compton Scattering; Electrons; Gamma Rays; Laser Optics; Lasers; Multiphoton Processes; Photons; Intense Laser Field; Invariant Measure; Laser Interaction; Nonperturbative; Photon Beams; Photon Polarization; Two Photon; Two-photon Emission; Volkov State
International Standard Serial Number (ISSN)
Article - Journal
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