Observation of quantum entanglement with top quarks at the ATLAS detector
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10494664" target="_blank" >RIV/00216208:11320/24:10494664 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/24:00611757 RIV/68407700:21220/24:00382188 RIV/68407700:21240/24:00382188 RIV/68407700:21340/24:00382188 and 2 more
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=X6Z76UQy4p" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=X6Z76UQy4p</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41586-024-07824-z" target="_blank" >10.1038/s41586-024-07824-z</a>
Alternative languages
Result language
angličtina
Original language name
Observation of quantum entanglement with top quarks at the ATLAS detector
Original language description
Entanglement is a key feature of quantum mechanics1-3, with applications infields such as metrology, cryptography, quantum information and quantumcomputation4-8. It has been observed in a wide variety of systems and length scales,ranging from the microscopic9-13 to the macroscopic14-16. However, entanglementremains largely unexplored at the highest accessible energy scales. Here we report thehighest-energy observation of entanglement, in top-antitop quark events producedat the Large Hadron Collider, using a proton-proton collision dataset with a centre-ofmassenergy of SQUARE ROOTs = 13 TeV and an integrated luminosity of 140 inverse femtobarns(fb)-1 recorded with the ATLAS experiment. Spin entanglement is detected from themeasurement of a single observable D, inferred from the angle between the chargedleptons in their parent top- and antitop-quark rest frames. The observable is measuredin a narrow interval around the top-antitop quark production threshold, at which theentanglement detection is expected to be significant. It is reported in a fiducial phasespace defined with stable particles to minimize the uncertainties that stem from thelimitations of the Monte Carlo event generators and the parton shower model inmodelling top-quark pair production. The entanglement marker is measured to beD = -0.537 +- 0.002 (stat.) +- 0.019 (syst.) for 340 GeV <mtt < 380 GeV. The observedresult is more than five standard deviations from a scenario without entanglementand hence constitutes the first observation of entanglement in a pair of quarks and thehighest-energy observation of entanglement so far.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10300 - Physical sciences
Result continuities
Project
<a href="/en/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Fundamental constituents of matter through frontier technologies</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Nature
ISSN
0028-0836
e-ISSN
1476-4687
Volume of the periodical
633
Issue of the periodical within the volume
Sept
Country of publishing house
GB - UNITED KINGDOM
Number of pages
6
Pages from-to
542-547
UT code for WoS article
001397550200001
EID of the result in the Scopus database
2-s2.0-85204418526