Please use this identifier to cite or link to this item:
https://hdl.handle.net/20.500.11851/11874
Title: | Observation of Quantum Entanglement With Top Quarks at the Atlas Detector | Authors: | Zwalinski L. Zou W. Zormpa O. Zorbas T.G. Zoch K. Zoccoli A. Živković L. |
Keywords: | Elementary Particles Protons Quantum Theory proton collision data set energy management experimental study Monte Carlo analysis quantum mechanics scale effect Article astronomy cryptography hadron large hadron collider luminance metrology polarization quantum computation quantum entanglement quantum information quantum mechanics elementary particle quantum theory |
Publisher: | Nature Research | Abstract: | Entanglement is a key feature of quantum mechanics1–3, with applications in fields such as metrology, cryptography, quantum information and quantum computation4–8. It has been observed in a wide variety of systems and length scales, ranging from the microscopic9–13 to the macroscopic14–16. 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 √s = 13 TeV and an integrated luminosity of 140 inverse 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 = −0.537 ± 0.002 (stat.) ± 0.019 (syst.) for 340GeV<mtt¯<380GeV. 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. © The Author(s) 2024. | URI: | https://doi.org/10.1038/s41586-024-07824-z https://hdl.handle.net/20.500.11851/11874 |
ISSN: | 0028-0836 |
Appears in Collections: | PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection |
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