Observation of quantum entanglement with top quarks at the ATLAS detector


Zwalinski L., Zou W., Zormpa O., Zorbas T., Zoch K., Zoccoli A., ...Daha Fazla

Nature, cilt.633, sa.8030, ss.542-547, 2024 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 633 Sayı: 8030
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1038/s41586-024-07824-z
  • Dergi Adı: Nature
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, International Bibliography of Social Sciences, Aerospace Database, Agricultural & Environmental Science Database, Animal Behavior Abstracts, Applied Science & Technology Source, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Art Source, Artic & Antarctic Regions, BIOSIS, CAB Abstracts, Chemical Abstracts Core, Communication Abstracts, EBSCO Education Source, Environment Index, Food Science & Technology Abstracts, Gender Studies Database, Geobase, INSPEC, MEDLINE, Metadex, MLA - Modern Language Association Database, Pollution Abstracts, Psycinfo, Public Affairs Index, Veterinary Science Database, zbMATH, DIALNET, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.542-547
  • İstanbul Üniversitesi Adresli: Evet

Özet

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