# Observation of a discrete time crystal

@article{Zhang2016ObservationOA, title={Observation of a discrete time crystal}, author={J. H. Zhang and Paul W Hess and A. Kyprianidis and Patrick Becker and A. C. Lee and J. Smith and Guido Pagano and Ionut-Dragos Potirniche and Andrew C. Potter and Ashvin Vishwanath and Norman Y. Yao and Christopher R. Monroe}, journal={Nature}, year={2016}, volume={543}, pages={217-220} }

Spontaneous symmetry breaking is a fundamental concept in many areas of physics, including cosmology, particle physics and condensed matter. An example is the breaking of spatial translational symmetry, which underlies the formation of crystals and the phase transition from liquid to solid. Using the analogy of crystals in space, the breaking of translational symmetry in time and the emergence of a ‘time crystal’ was recently proposed, but was later shown to be forbidden in thermal equilibrium…

## 752 Citations

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Time crystals are physical systems whose time translation symmetry is spontaneously broken. Although the spontaneous breaking of continuous time-translation symmetry in static systems is proved…

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Using Doob's transform as a tool, this work provides a mechanism to build classical time-crystal generators from the rare event statistics of some driven diffusive systems and uncovers striking similarities, but also key differences, with the Kuramoto synchronization transition.

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Floquet driven systems represent an extremely interesting arena to study out-of-equilibrium phenomena. For instance, they provide realizations of discrete time crystals, where the discrete time…

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This work observes long-lived temporal correlations, experimentally identifies the phase boundary and finds that the temporal order is protected by strong interactions, which opens the door to exploring dynamical phases of matter and controlling interacting, disordered many-body systems.

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Periodically driven quantum systems host a range of non-equilibrium phenomena which are unrealizable at equilibrium. Discrete time-translational symmetry in a periodically driven many-body system can…

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