Matteo Brunelli unveils quantum grandfather clock
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- Matteo Brunelli and his team at Collège de France unveiled a quantum grandfather clock design that uses a single atom, two mirrors, and light to mimic a pendulum clock.
- Quantum clock operates inside a cavity with a fixed mirror and an oscillating mirror, where a three‑level atom’s thermally induced transitions emit photons that bounce between the mirrors and drive the oscillation.
- Atom serves as the escapement mechanism, repeatedly cycling through energy states to give the oscillating mirror regular kicks and maintain stable ticks without external lasers.
- Design breaks the thermodynamic uncertainty relation that limited previous autonomous quantum clocks, allowing higher accuracy while functioning as a self‑contained thermodynamic machine.
- Research aims to deepen understanding of quantum clock accuracy and explore the interplay between quantum mechanics and gravity.
Why it matters: Quantum metrology labs gain a self‑contained, ultra‑accurate clock, reducing reliance on laser systems and cutting experimental costs, while advancing tests of quantum‑gravity interplay and enabling new precision experiments in fundamental physics.
