Physicists help uncover ‘spooky’ quantum effect in the Large Hadron Collider | CERN Detects Quant…

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Physicists help uncover 'spooky' quantum effect in the Large Hadron Collider

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Physicists at the University of Oxford have helped confirm that one of the strangest phenomena in physics—quantum entanglement—occurs even among some of the heaviest and most fleeting particles ever created. The discovery, made using the world's most powerful particle collider at CERN, has been published in Physical Review Letters.

Entanglement is the phenomenon in which two particles from the same origin remain connected, even if they move far apart in time and space. If something affects one particle, it will also affect all the particles with which it is entangled. This means that measuring a property of one particle instantly tells you something about its entangled partners, no matter how distant they are.

CERN Detects Quantum Entanglement in Particles Born From The Higgs Boson

In the cascade of debris that sprays out from high-energy collisions in the world's most powerful particle collider, physicists have found strong evidence of a phenomenon Albert Einstein famously called "spooky action at a distance".

It's not the first time quantum entanglement has been detected at the LHC – but this time, it's somewhere new.

Now, scientists have found the first strong evidence of entanglement between a pair of Z bosons produced in the decay of a Higgs boson – their spins so inextricably linked that one cannot be fully described without the other.

"The spins of the two Z bosons are extremely entangled, considerably more so than in the top-antitop case that was measured previously," said physicist Juan Antonio Aguilar-Saavedra of the Institute of Theoretical Physics in Spain, translated from a Spanish-language video.

CERN’s Large Hadron Collider Finds ‘spooky Action’ In Particle Collisions

Physicists at the University of Oxford have contributed to a confirmation that quantum entanglement, Albert Einstein’s “spooky action at a distance”, persists even within the fleeting existence of some of the most massive particles created by science. Using the Large Hadron Collider at CERN, an international collaboration detected entanglement in pairs of Z bosons, particles that vanish in a fraction of a second after being produced by collisions of thirteen trillion electron volts.

This demonstration extends entanglement to energies far beyond previous tests, and as Professor Alan Barr commented, “We’re used to thinking of entanglement as something delicate, seen in laboratory experiments with single photons.” The finding published in Physical Review Letters on September 11, 2026 has implications for technologies that use entanglement, including quantum computing and secure communication networks.

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