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.
Lykken, ``Quantum Information for Particle Theorists,'' PoS TASI2020, 010 (2021) arXiv:2010.02931 [quant-ph] https://arxiv.org/abs/2010.02931
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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.