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

  title={Discrete Time-Crystalline Order in Cavity and Circuit QED Systems.},
  author={Zongping Gong and Ryusuke Hamazaki and Masahito Ueda},
  journal={Physical review letters},
  volume={120 4},
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… 

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