# Discrete Time-Crystalline Order in Cavity and Circuit QED Systems.

@article{Gong2017DiscreteTO, title={Discrete Time-Crystalline Order in Cavity and Circuit QED Systems.}, author={Zongping Gong and Ryusuke Hamazaki and Masahito Ueda}, journal={Physical review letters}, year={2017}, volume={120 4}, pages={ 040404 } }

Discrete time crystals are a recently proposed and experimentally observed out-of-equilibrium dynamical phase of Floquet systems, where the stroboscopic dynamics of a local observable repeats itself at an integer multiple of the driving period. We address this issue in a driven-dissipative setup, focusing on the modulated open Dicke model, which can be implemented by cavity or circuit QED systems. In the thermodynamic limit, we employ semiclassical approaches and find rich dynamical phases on…

## 114 Citations

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Time crystals are quantum many-body systems which are able to self-organize their motion in a periodic way in time. Discrete time crystals have been experimentally demonstrated in spin systems.…

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Discrete time crystals (DTCs) are a many-body state of matter whose dynamics are slower than the forces acting on it. The same is true for classical systems with period-doubling bifurcations. Hence,…

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These time crystals arise only from the Floquet dynamical symmetry and thus appear in both dissipative and isolated systems and in the presence of disorder as long as the FDS is respected, and their experimental realizations in cold atom experiments are discussed.

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