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Experimental observation of a generalized Gibbs ensemble
Tim Langen1, Sebastian Erne2, Remi Geiger1
1Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria.
Science (New York, N.Y.)
|April 11, 2015
Summary
Researchers experimentally show that a Bose gas in one dimension relaxes to a generalized ensemble state. This finding addresses fundamental questions in quantum statistical mechanics and non-equilibrium dynamics.
Area of Science:
- Quantum Many-Body Physics
- Statistical Mechanics
- Quantum Dynamics
Background:
- Describing non-equilibrium dynamics in isolated quantum systems is a key challenge.
- Standard statistical mechanics ensembles are insufficient for systems with many conserved quantities.
Purpose of the Study:
- To experimentally investigate the relaxation dynamics of a quantum many-body system.
- To determine if generalized ensembles can describe systems with nontrivial conserved quantities.
Main Methods:
- Experimental realization of a degenerate one-dimensional Bose gas.
- Analysis of correlation functions up to 10th order to verify the ensemble state.
Main Results:
- The Bose gas was observed to relax to a state describable by a generalized ensemble.
- Experimental data confirmed the predictions for entropy maximization in such systems.
Conclusions:
- Generalized ensembles are applicable to isolated quantum many-body systems.
- This provides insight into the emergence of classical statistical properties from quantum evolution.
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