In perturbative relativistic 2→2 scattering the concurrence of the traced-out qubit density matrix depends at leading order on the real part of the inelastic forward amplitude.
Tree-level entanglement in quantum electrodynamics
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The paper derives regularized density matrix expressions and polarization correlations for double Compton scattering of entangled photons by enforcing unitarity at tree level, proposing a novel cross-section definition and drawing an analogy to Young's diffraction experiment.
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Qubit entanglement from forward scattering
In perturbative relativistic 2→2 scattering the concurrence of the traced-out qubit density matrix depends at leading order on the real part of the inelastic forward amplitude.
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Regularized Compton double scattering via unitarity
The paper derives regularized density matrix expressions and polarization correlations for double Compton scattering of entangled photons by enforcing unitarity at tree level, proposing a novel cross-section definition and drawing an analogy to Young's diffraction experiment.