Hidden Synchrony: Two Quantum Clocks Align via Dissipation in Trapped Ions

Physicists demonstrated synchronization between two quantum van der Pol oscillators realized as shared vibrational modes in a trapped-ion pair. The fixed relative phase emerges only in the joint state, not in either oscillator alone, thanks to engineered gain/loss processes and a collective dissipative channel. This hidden synchronization, detected through joint Wigner-function maps, points toward scalable quantum oscillator networks with potential uses in quantum sensors and clocks beyond classical limits.