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Observation of quantum entanglement with top quarks at the ATLAS detector

Författare

  • G. Aad
  • T.P.A. Åkesson
  • C. Doglioni
  • P.A. Ekman
  • V. Hedberg
  • H. Herde
  • B. Konya
  • E. Lytken
  • R. Poettgen
  • N.D. Simpson
  • O. Smirnova
  • L. Zwalinski
Visa allt

Summary, in English

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

Avdelning/ar

  • Partikel- och kärnfysik
  • eSSENCE: The e-Science Collaboration
  • Fysiska institutionen

Publiceringsår

2024

Språk

Engelska

Sidor

542-547

Publikation/Tidskrift/Serie

Nature

Volym

633

Avvikelse

8030

Dokumenttyp

Artikel i tidskrift

Förlag

Nature Publishing Group

Ämne

  • Subatomic Physics

Nyckelord

  • 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
  • elementary particle
  • quantum theory

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 0028-0836