Entanglement and quantum tomography with top quarks at the LHC



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Afik, Yoav and Muñoz de Nova, Juan Ramón (2021) Entanglement and quantum tomography with top quarks at the LHC. The European Physical Journal Plus, 136 (9). ISSN 2190-5444

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Official URL: https://doi.org/10.1140/epjp%2Fs13360-021-01902-1


Entanglement is a central subject in quantum mechanics. Due to its genuine relativistic behavior and fundamental nature, high-energy colliders are attractive systems for the experimental study of fundamental aspects of quantum mechanics. We propose the detection of entanglement between the spins of top–antitop–quark pairs at the LHC, representing the first proposal of entanglement detection in a pair of quarks, and also the entanglement observation at the highest energy scale so far. We show that entanglement can be observed by direct measurement of the angular separation between the leptons arising from the decay of the top–antitop pair. The detection can be achieved with high statistical significance, using the current data recorded during Run 2 at the LHC. In addition, we develop a simple protocol for the quantum tomography of the top–antitop pair. This experimental technique reconstructs the quantum state of the system, providing a new experimental tool to test theoretical predictions. Our work explicitly implements canonical experimental techniques in quantum information in a two-qubit high-energy system, paving the way to use high-energy colliders to also study quantum information aspects.

Item Type:Article
Additional Information:

CRUE-CSIC (Acuerdos Transformativos 2021)

Subjects:Sciences > Physics
ID Code:70541
Deposited On:17 Feb 2022 11:53
Last Modified:18 Feb 2022 12:59

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