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@ARTICLE{Aad:616865,
      author       = {Aad, Georges and others},
      collaboration = {{ATLAS Collaboration}},
      title        = {{O}bservation of quantum entanglement with top quarks at
                      the {ATLAS} detector},
      journal      = {Nature},
      volume       = {633},
      number       = {8030},
      issn         = {0028-0836},
      address      = {London [u.a.]},
      publisher    = {Nature Publ. Group},
      reportid     = {PUBDB-2024-06556, arXiv:2311.07288. CERN-EP-2023-230},
      pages        = {542-547},
      year         = {2024},
      note         = {Nature 633 (2024) 542. 49 pages in total, author list
                      starting page 32, 4 figures, 2 tables, published as Nature
                      633 (2024) 542. All figures including auxiliary figures are
                      available at
                      http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2021-24},
      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 √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 $340\,{\rm{GeV}} < {m}_{t\bar{t}} <
                      380\,{\rm{GeV}}$. 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.},
      keywords     = {p p: scattering (INSPIRE) / p p: colliding beams (INSPIRE)
                      / top: pair production (INSPIRE) / particle: stability
                      (INSPIRE) / parton: showers (INSPIRE) / threshold:
                      production (INSPIRE) / entanglement: quantum (INSPIRE) /
                      anti-top (INSPIRE) / ATLAS (INSPIRE) / numerical
                      calculations: Monte Carlo (INSPIRE) / spin (INSPIRE) / final
                      state: ((n)jet dilepton) (INSPIRE) / electron (INSPIRE) /
                      muon (INSPIRE) / CERN LHC Coll (INSPIRE) / phase space
                      (INSPIRE) / experimental results (INSPIRE) / 13000 GeV-cms
                      (INSPIRE)},
      cin          = {ATLAS},
      ddc          = {500},
      cid          = {I:(DE-H253)ATLAS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / DFG
                      project G:(GEPRIS)469666862 - Präzisionstests des
                      Standardmodells unter der Verwendung von geboosteten
                      W/Z-Bosonen am Large Hadron Collider (469666862)},
      pid          = {G:(DE-HGF)POF4-611 / G:(GEPRIS)469666862},
      experiment   = {EXP:(DE-H253)LHC-Exp-ATLAS-20150101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2311.07288},
      howpublished = {arXiv:2311.07288},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2311.07288;\%\%$},
      pubmed       = {pmid:39294352},
      UT           = {WOS:001397550200001},
      doi          = {10.1038/s41586-024-07824-z},
      url          = {https://bib-pubdb1.desy.de/record/616865},
}