Physicists observe a new form of temporal order: the time rondeau crystal
A team led by Leo Joon Il Moon at UC Berkeley reported the first experimental observation of a time rondeau crystal, a phase in which long-range temporal order coexists stably with controllable short-time disorder.
Using an ensemble of carbon-13 nuclear spins in diamond driven by tailored pulse sequences, they sustained the ordered response for over 170 drive cycles — roughly four seconds. The work shows that order and randomness can robustly coexist in a periodically driven quantum system, generalising the notion of discrete time crystals that spontaneously break time-translation symmetry.
The finding deepens the study of how driven, far-from-equilibrium systems organise themselves in time, and hints at applications in quantum sensing and temporally encoded information storage.