Vienna researchers have created something that shouldn't work by the rules we learned in school: a one-dimensional gas of ultracold atoms where mass and energy move indefinitely without losing power to friction or collisions.
In the real world, resistance is everywhere. Rub your hands together and friction creates heat. Push a ball across a table and it slows down. Even light traveling through glass loses a tiny bit of energy. These losses happen because particles collide and scatter, gradually converting ordered motion into random thermal chaos. It's so fundamental we barely notice it anymore.
But in this quantum system at Vienna University of Technology, something different happens. The atoms collide constantly—thousands of times per second—yet the gas behaves like a perfect conductor. Energy and momentum flow through it without degrading, as if the collisions were choreographed rather than chaotic.
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Start Your News Detox"By studying the atomic current, we could see that diffusion is practically completely suppressed," says Frederik Møller, one of the researchers. "The gas behaves like a perfect conductor; even though countless collisions occur between the atoms, quantities like mass and energy flow freely, without dissipating into the system."
The key is what happens during those collisions. In normal matter, when particles crash into each other, they scatter in random directions, their individual momenta mixing together like colors of paint. But in this quantum gas, momentum isn't scattered—it's exchanged. Each atom passes its momentum to its collision partner intact, like a Newton's cradle toy where the motion continues indefinitely without slowing down. The total momentum of the system stays perfectly conserved.
This behavior reveals something profound about why things behave the way they do. In everyday physics, we expect systems to reach thermal equilibrium—a state where all particles have the same average temperature and energy is evenly distributed. It's so universal we call it a law of thermodynamics. Yet this quantum gas refuses to thermalize. Its energy remains organized, flowing coherently rather than dispersing into heat.
"These results show why such an atomic cloud does not thermalize—why it doesn't distribute its energy according to the usual laws of thermodynamics," Møller explains. "Studying transport under such perfectly controlled conditions could open new ways to understand how resistance emerges, or disappears, at the quantum level."
The findings, published in Science in 2025, matter because they expose a gap in our understanding. For centuries, physics has treated friction and energy loss as inevitable. But at the quantum scale, under the right conditions, they're not. Understanding when and why resistance emerges—and when it vanishes—could eventually reshape how we think about energy transport in materials, from superconductors to future quantum computers.
For now, this quantum wire remains a laboratory curiosity, a perfectly controlled system that reveals nature's hidden rules. But every major technology started as something that seemed to violate common sense.
