Quantum discord and steering in top quarks at the LHC

Abstract

Top quarks have been recently shown to be a promising system to study quantum information at the highest-energy scale available. The current lines of research mostly discuss topics such as entanglement, Bell nonlocality or quantum tomography. Here, we provide the full picture of quantum correlations in top quarks by studying also quantum discord and steering. We find that both phenomena are present at the LHC. In particular, quantum discord in a separable quantum state is expected to be detected with high-statistical significance. Interestingly, due to the singular nature of the measurement process, quantum discord can be measured following its original definition, and the steering ellipsoid can be experimentally reconstructed, both highly-demanding measurements in conventional setups. In contrast to entanglement, the asymmetric nature of quantum discord and steering can provide witnesses of $CP$-violating physics beyond the Standard Model.

arXiv comment6 pages, 3 figures

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Cited by in corpus (34)

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• Entanglement and Bell inequality violation in vector diboson systems produced in decays of spin-0 particles
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• Interference Resurrection of the $\tau$ Dipole through Quantum Tomography
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• Climbing to the Top of the ATLAS 13 TeV data
• Entropic uncertainty relations and quantum Fisher information of top quarks in a large hadron collider
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• Analytical Insights on Hadronic Top Quark Polarimetry
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