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Abstract |
Quantum entanglement, a fundamental aspect of quantum mechanics and quantum field theory, plays a central role in areas such as cryptography, quantum computation, and information theory. Recent measurements by the ATLAS and CMS collaborations have demonstrated entanglement in top-antitop quark pairs produced at the LHC, motivating further exploration of this phenomenon. This work investigates the entanglement properties of top-antitop systems at future e+e- colliders, highlighting two key findings: (i) Entanglement becomes significant at center-of-mass energies above 400 GeV, and (ii) its magnitude depends on the initial beam polarization, which can be tuned to enhance the quantum correlations by up to 9% between the eL+eR- and the eR+eL- case. We further analyze the impact of single final-state gluon radiation on entanglement, finding that high-energy emissions can substantially reduce it, potentially transforming an entangled state into a separable one. A complementary statistical analysis shows that this radiation-induced entanglement loss, interpreted as an experimentally accessible indicator of gluon-induced decoherence effects, could be observed with a significance exceeding 5 sigma at the expected LCF configurations, using hadronic polarimetry in leptonic+hadronic and fully hadronic channels. Consistent results are obtained for two robust quantum observables, establishing linear colliders as gateways to further investigate quantum entanglement and probe signatures of quantum decoherence in particle physics in the decades to come. |
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Address |
[Camacho Juarez, Jose Manuel; Moreno, Maria; Vos, Marcel] Univ Valencia, Inst Fis Corpuscular IFIC, CSIC, C-Catedrat Jose Beltran 2, Paterna 46980, Spain, Email: Jose.M.Camacho@uv.es; |
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