A Tiny Quantum Motor in a Diamond ⚡ экспресс
A fully quantum engine has been realized that converts quantum coherence (the synchronized state of particles) into mechanical work. A single spin (magnetic moment) in diamond cyclically accumulates energy in a quantum battery using a coherent bath, and after just a few cycles it delivers nearly 200% more work than its classical counterpart. Success criteria were defined, and the special role of the coherent contact between engine and battery was revealed. This shows that all components of a nanomachine can be quantum, paving the way to ultra-efficient devices.
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.
🎯 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.