Physicists report the first observations of quantum entanglement in quarks, the heaviest known fundamental particles, inside the Large Hadron Collider
The ATLAS detector, part of the Large Hadron Collider, sits 100 meters below ground, where it measures various properties of high-energy particles.— a state in which particles intermingle, losing their individuality so they can no longer be described separately — between quarks. The feat, achieved at CERN, Europe’s particle-physics laboratory near Geneva, Switzerland, could open the door to further probes of quantum information in particles at high energies.
To observe entanglement at the LHC, physicists working on the ATLAS detector analysed about one million pairs of top and anti-top quarks — the heaviest of all known fundamental particles and their antimatter counterparts. They found statistically overwhelming evidence for entanglement, which they announced in September last year, and describe in detail today in
“It is really interesting because it’s the first time you can study entanglement at the highest possible energies obtained with the LHC,” says Giulia Negro, a particle physicist at Purdue University in West Lafayette, Indiana, who worked on the CMS analysis.— the current best theory of fundamental particles and forces through which they interact — is built atop quantum mechanics, which describes entanglement. But the latest measurement is nonetheless valuable, researchers say.
After making an experimental measurement of the top-quark spins, the teams compared their results with theoretical predictions. But the models of top-quark production and decays didn’t match the detector measurements.
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1st-ever observation of 'spooky action' between quarks is highest-energy quantum entanglement ever detectedBen Turner is a U.K. based staff writer at Live Science. He covers physics and astronomy, among other topics like tech and climate change. He graduated from University College London with a degree in particle physics before training as a journalist.
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