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Measuring the Evolution of Entanglement in Compton Scattering

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arxiv 2406.14352 v1 pith:LBWRHPHI submitted 2024-06-20 quant-ph

Igor Tkachev , Sultan Musin , Dzhonrid Abdurashitov , Alexander Baranov , Fedor Guber , Alexander Ivashkin , Alexander Strizhak This is my paper · ORCID
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The evolution of the entanglement measure during Compton scattering is studied. Our analytical results show that the corresponding measure coincides with the concurrence of the two-qubit state arising after scattering. The state never collapses to a separable one, contrary to what was previously assumed. The behavior of quantum entanglement during scattering is identical to the behavior of initially classically correlated photons up to a constant factor equal to two. This is consistent with local quantum field theory, and "spooky action at a distance" is not required to explain the change in state of nonlocally entangled qubits during the measurement of one of them. Our dedicated experiment with annihilation photons confirms these results and explains the "Puzzle of Decoherence" observed recently.

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  1. An accelerator-based source of high-intensity quantum-entangled annihilation gamma photons

    physics.acc-ph 2026-08 conditional novelty 4.0 of 10

    A proposal for an accelerator-driven source of high-intensity entangled 511 keV gamma pairs at Jefferson Lab, with the flux advantage asserted but not yet quantitatively demonstrated.

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