Simple

A Tiny Quantum Motor in a Diamond ⚡ экспресс

Original: "Converting coherence into work with a fully quantum engine"
arXiv:2511.06096 · 2025-11-08 · CC BY 4.0 · ⏱ 1 min · Quantum Physics Mesoscale
Physicists have built the first fully quantum engine: it runs not on heat, but on the flawless rhythm of a single electron.
Abstract

Scientists have created a quantum engine that runs not on heat but on particle 'coherence' — as if a battery were charged by the synchronized dance of atoms. In a few cycles, it produced almost three times more energy than a conventional analogue. What if future machines are powered not by fuel but by the order of the quantum world?

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A regular motor burns fuel and wastes a ton of energy as heat — that's dictated by the laws of thermodynamics. A quantum engine does it differently: its fuel isn’t heat, but a perfect rhythm. Physicists call this rhythmic precision quantum coherence. Think of it like an orchestra where every musician keeps flawless tempo — but here, the entire orchestra is just a single electron.

Scientists used a diamond with a carbon defect, which hosts that precise electron. Using a laser probe, they monitored its state, like tapping into a tiny battery. The electron was charged with a microwave field — imagine setting an ideal musical beat that makes the particle “dance.” The stored energy then turned into useful work. Remarkably, the same electron was both the motor and the battery.

After several cycles, the quantum machine produced nearly double the work of its classical heat-based twin. This success opens the door to nanomotors that will only operate at full power in the quantum regime.

The entire engine fits on the tip of a needle and is invisible to the naked eye — its working substance is just a single electron.

🎯 Quantum coherence is extremely fragile: the slightest disturbance throws off the rhythm. Yet this motor runs at ordinary room temperature, without bulky refrigerators. Such resilience feels almost miraculous — and suggests that quantum machines might one day leave the lab.

Scientists
Christian DopplerD. B. McLaughlinDidier QuelozMichel MayorR. A. RossiterJacob Bekenstein
Tags
entropy carbon spectroscopy
Laws
second law of thermodynamicsDoppler effectBekenstein-Hawking entropyMaxwell's equationsPlanck's lawPlanck–Einstein relation
Original: arXiv:2511.06096 · CC BY 4.0 · bridge42worlds