Physicists at the Large Hadron Collider (LHC) have successfully observed quantum entanglement between top quarks for the first time. This discovery confirms that the “spooky action at a distance” predicted by quantum mechanics holds true even at the colossal energy levels of particle collisions, opening a new door to test our fundamental understanding of reality.
Entanglement at the energy frontier
Quantum entanglement is a phenomenon where two particles become linked in such a way that the state of one instantly influences the other, no matter how far apart they are. While this has been proven in laboratories with photons and electrons, observing it in the chaotic, high-energy environment of the LHC is a massive leap forward.
The ATLAS and CMS collaborations at CERN measured this effect between pairs of top quarks produced in proton-proton collisions. Top quarks are the heaviest known elementary particles. Unlike lighter quarks, they have an extremely short lifespan—they decay in a tiny fraction of a second (roughly $10^{-25}$ seconds).
This short life is actually a gift for physicists. Top quarks decay so quickly that they do not have time to form hadron particles (like protons). This means the “spin” information of the original quark is perfectly preserved in its decay products. By tracking these decay products, scientists can reconstruct the spin of the original top quarks and prove they were entangled at the moment of their creation.
Testing quantum reality with Bell inequalities
The observation of entanglement is just the first step. The real excitement lies in what comes next: using these top quarks to perform Bell inequality tests.
Bell’s theorem is a way to test whether quantum mechanics is the true description of reality, or if there are “hidden variables” we don’t know about that determine particle behavior. Experiments with low-energy particles have consistently backed quantum mechanics. However, some theories suggest that quantum processes in the brain or the universe might operate differently at other scales.
Now, physicists want to run these tests at the 13 Tera-electronvolt (TeV) scale. The recent results from ATLAS and CMS suggest that the LHC can be used as a laboratory to test Bell inequalities. If the standard rules of quantum mechanics break down at these extreme energies, it would signal “new physics”—a discovery that could rewrite our understanding of the universe.
A new tool to probe the Standard Model
This breakthrough turns the LHC into a tool for quantum information science. Observing entanglement in top quarks confirms the Standard Model of particle physics in a new territory.
The results showed that the entanglement was statistically significant (exceeding five standard deviations, the gold standard in physics). This precision allows researchers to look for subtle deviations. Any mismatch between the predicted and observed entanglement could hint at unknown particles or forces interacting with the top quark.
What you can do about it
While you cannot run a particle collider at home, you can stay engaged with the shifting understanding of our universe.
- Stay curious: Follow updates from CERN and physics journals. The next phase of these experiments could challenge how we define reality.
- Explore quantum concepts: Read about how quantum teleportation is achieved to understand how these principles are applied in technology today.
- Broaden your view: Concepts like entanglement often bridge the gap between hard science and philosophy. Reading about theories where consciousness connects to the universe can provide a wider context for these discoveries.
Sources & related information
CERN – LHC experiments at CERN observe quantum entanglement at the highest energy yet – 2024
The ATLAS and CMS collaborations observed quantum entanglement between top quarks and their antimatter counterparts at 13 TeV, confirming quantum predictions at the highest energy scale ever tested.
Nature – Observation of quantum entanglement with top quarks at the ATLAS detector – 2024
This peer-reviewed study details the methodology and results of the ATLAS experiment, reporting the observation of spin entanglement in top quark pairs with high statistical significance.
Physics World – Quantum entanglement observed in top quarks – 2023
This article explains the significance of the findings, noting that entanglement persists at energies 12 orders of magnitude higher than typical laboratory experiments.
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