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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