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Scientists Trap Single Antimatter Particle for Months

A team of physicists at Northwestern University has managed to hold a single antimatter particle in a trap for months, unlocking new possibilities for studying quantum states and the mysteries of physics.

Radwan AbdulhadiEditor and technology writer

Published: October 25, 2026 · Updated: October 25, 2026 · 3 min read

Scientists Trap Single Antimatter Particle for Months — Image: WIRED

Trapping Antimatter in Isolation

Antimatter has long posed severe challenges for researchers because these elusive and reactive particles are notoriously difficult to [get ahold of](https://www.wired.com/story/this-giant-subterranean-neutrino-detector-is-taking-on-the-mysteries-of-physics/), let alone study. When an antiparticle comes into contact with ordinary matter, the two annihilate each other and release energy, creating significant experimental hazards.

To prevent research facilities from dangerous explosions, scientists typically rely on vacuum chambers and electromagnetic fields that suspend the antiparticles [in isolation](https://www.wired.com/story/the-nothing-that-has-the-potential-to-be-anything/). However, studying these particles and experimenting with their behavior on [a quantum scale](https://www.wired.com/story/is-it-even-possible-to-understand-quantum-mechanics/) has remained exceptionally difficult.

A Breakthrough at Absolute Zero

Recently, a team of physicists at Northwestern University led by Gerald Gabrielse managed to trap a single antimatter particle for months. Cooling it to temperatures near absolute zero, the researchers could control its quantum states with great precision without even touching it. The experiment, published in [Physical Review Letters](https://journals.aps.org/prl/abstract/10.1103/gbkc-6nlj), represents a significant breakthrough in our understanding of one of the great mysteries of physics.

The team developed a device known as a single-positron quantum cyclotron, which used electric and magnetic fields to hold a positron—the antimatter counterpart of [electrons](https://www.wired.com/story/the-electron-is-having-a-magnetic-moment-its-a-big-deal/)—in a vacuum at a temperature close to absolute zero. This maintained the antimatter particle at its lowest energy state, allowing the researchers to induce controlled changes in its quantum behavior.

Unresolved Mysteries of Matter and Antimatter

In theory, antimatter [should be everywhere](https://www.wired.com/story/antihelium-offers-hope-in-the-search-for-dark-matter/). Mathematics predicts that every particle of matter has an equivalent antiparticle, a fact that scientists have verified experimentally. The universe should therefore contain similar amounts of both, but almost everything we observe is made up of ordinary matter, and experts [don’t know why](https://www.wired.com/story/particle-hunters-physics-icecube-lhc/).

While it is possible to produce [particles in laboratories](https://www.wired.com/story/scientists-find-most-convincing-evidence-yet-dark-matter-particle/), analyzing them over extended periods has always been blocked by annihilation risks. Because the new methodology did not destroy the particle, the researchers were able to keep the single antiparticle trapped for months to repeat measurements.

Enhancing Precision for Future Physics

Scientists already know that matter and antimatter share very similar properties. For example, an electron and a positron have exactly the same mass, though their electric charges are opposite. However, questions remain regarding whether there are small, unnoticed differences between the two forms of matter.

To investigate this, researchers want to compare the magnetic properties of both particles. Physicists have previously made precise measurements with electrons, but achieving comparable precision with positrons proved difficult. According to the American Physical Society, the new device could enable measurements of antimatter particles about 30 times more precise than previous capabilities.

So far, the experiment has not revealed any unexpected differences between the two particles, but it substantially improves the ability to detect them. If future measurements reveal that a positron responds to magnetic fields differently than an electron, scientists would have to revise some fundamental laws used to explain particle behavior.