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Dissipation Induced Nonstationarity in a Quantum Gas
Berislav Buča1, Dieter Jaksch1,2
1Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
Physical Review Letters
|January 18, 2020
Summary
This study reveals that driven two-component Bose-Einstein condensates coupled to optical cavities exhibit instability, even when mean-field theory suggests stability. Dissipation induces squeezing and entanglement, forming a dissipative time crystal.
Area of Science:
- Quantum physics
- Condensed matter physics
- Atomic, molecular, and optical physics
Background:
- Recent observations show nonstationary dynamics in driven two-component Bose-Einstein condensates coupled to optical cavities.
- Existing analyses rely on mean-field theory, which may not capture all system behaviors.
Purpose of the Study:
- To solve the underlying model in the thermodynamic limit and analyze the dynamics of the driven two-component Bose-Einstein condensate system.
- To investigate the conditions leading to instability and the role of cavity dissipation.
Main Methods:
- Solving the underlying model in the thermodynamic limit.
- Utilizing perturbation theory for finite system sizes.
- Analyzing higher-order correlation functions.
Main Results:
- The system is always dynamically unstable, contrary to mean-field predictions.
- Cavity dissipation induces squeezing and entanglement.
- The observed dynamics can be interpreted as the formation of a dissipative time crystal.
Conclusions:
- Mean-field theory is insufficient for fully describing the dynamics of this system.
- Higher-order correlations and cavity dissipation are crucial for understanding the observed nonstationary behavior.
- The system exhibits characteristics of a dissipative time crystal.
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