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Author  |
ATLAS Collaboration (Aad, G. et al); Aikot, A.; Amos, K.R.; Aparisi Pozo, J.A.; Bailey, A.J.; Bouchhar, N.; Cabrera Urban, S.; Cantero, J.; Cardillo, F.; Castillo Gimenez, V.; Chitishvili, M.; Costa, M.J.; Didenko, M.; Escobar, C.; Fiorini, L.; Fuster, J.; Garcia, C.; Garcia Navarro, J.E.; Gomez Delegido, A.J.; Gonzalez de la Hoz, S.; Gonzalvo Rodriguez, G.R.; Guerrero Rojas, J.G.R.; Lacasta, C.; Marti-Garcia, S.; Martinez Agullo, P.; Melini, D.; Mitsou, V.A.; Monsonis Romero, L.; Moreno Llacer, M.; Munoz Perez, D.; Navarro-Gonzalez, J.; Poveda, J.; Prades Ibañez, A.; Rubio Jimenez, A.; Ruiz-Martinez, A.; Sabatini, P.; Saibel, A.; Salt, J.; Sanchez Sebastian, V.; Sayago Galvan, I.; Senthilkumar, V.; Soldevila, U.; Sanchez, J.; Torro Pastor, E.; Valero, A.; Valiente Moreno, E.; Valls Ferrer, J.A.; Varriale, L.; Villaplana Perez, M.; Vos, M.; Zakareishvili, T. |
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Title |
Observation of quantum entanglement with top quarks at the ATLAS detector |
Type |
Journal Article |
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Year |
2024 |
Publication |
Nature |
Abbreviated Journal |
Nature |
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Volume |
633 |
Issue |
8030 |
Pages |
542-547 |
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Keywords |
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Abstract |
Entanglement is a key feature of quantum mechanics(1-3), with applications in fields such as metrology, cryptography, quantum information and quantum computation(4-8). It has been observed in a wide variety of systems and length scales, ranging from the microscopic(9-13) to the macroscopic(14-16). However, entanglement remains largely unexplored at the highest accessible energy scales. Here we report the highest-energy observation of entanglement, in top-antitop quark events produced at the Large Hadron Collider, using a proton-proton collision dataset with a centre-of-mass energy of root s=13TeV and an integrated luminosity of 140inverse femtobarns (fb)(-1) recorded with the ATLAS experiment. Spin entanglement is detected from the measurement of a single observable D, inferred from the angle between the charged leptons in their parent top- and antitop-quark rest frames. The observable is measured in a narrow interval around the top-antitop quark production threshold, at which the entanglement detection is expected to be significant. It is reported in a fiducial phase space defined with stable particles to minimize the uncertainties that stem from the limitations of the Monte Carlo event generators and the parton shower model in modelling top-quark pair production. The entanglement marker is measured to be D=-0.5370.002 (stat.)+/- 0.019 (syst.) for 340 GeV < m(t<(t)over bar>) 380 GeV. The observed result is more than five standard deviations from a scenario without entanglement and hence constitutes the first observation of entanglement in a pair of quarks and the highest-energy observation of entanglement so far. |
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Address |
[Aad, G.; Barbero, M.; Bernon, F.; Chiedde, N.; Coadou, Y.; Djama, F.; Duperrin, A.; Feligioni, L.; Fernoux, M. J. V.; Fujimoto, M.; Hallewell, G. D.; Laatu, L. A. O.; Ramos, J. Manjarres; Monnier, E.; Muanza, S.; Nagy, E.; Petit, E.; Rougier, C.; Rozanov, A.; Stark, J.; Strebler, T.; Sur, N.; Talby, M.; Tarna, G.; Theveneaux-Pelzer, T.; Torres, H.; Vallier, A.] Aix Marseille Univ, CPPM, CNRS, IN2P3, Marseille, France |
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Publisher |
Nature Portfolio |
Place of Publication |
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Editor |
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Language |
English |
Summary Language |
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Original Title |
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Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0028-0836 |
ISBN |
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Notes |
WOS:001397550200001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6520 |
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