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Observation of quantum entanglement with top quarks at the ATLAS detector

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  • معلومة اضافية
    • بيانات النشر:
      Nature Research
    • الموضوع:
      2024
    • Collection:
      University of Glasgow: Enlighten - Publications
    • نبذة مختصرة :
      Entanglement is a key feature of quantum mechanics1,2,3, with applications in fields such as metrology, cryptography, quantum information and quantum computation4,5,6,7,8. It has been observed in a wide variety of systems and length scales, ranging from the microscopic9,10,11,12,13 to the macroscopic14,15,16. 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 GeV < mtt¯ < 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.
    • File Description:
      text
    • Relation:
      https://eprints.gla.ac.uk/342517/1/342517.pdf; Aad, G. et al. (2024) Observation of quantum entanglement with top quarks at the ATLAS detector. Nature , 633(8030), pp. 542-547. (doi:10.1038/s41586-024-07824-z ) (PMID:39294352) (PMCID:PMC11410654)
    • الدخول الالكتروني :
      https://eprints.gla.ac.uk/342517/
      https://eprints.gla.ac.uk/342517/1/342517.pdf
    • Rights:
      cc_by_4
    • الرقم المعرف:
      edsbas.9795E136