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Recurrences in an isolated quantum many-body system
Bernhard Rauer1, Sebastian Erne1,2,3, Thomas Schweigler1
1Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria.
Science (New York, N.Y.)
|February 24, 2018
Summary
Researchers demonstrate quantum state recurrences in large interacting systems by observing collective excitations. This breakthrough allows studying coherent dynamics in thousands of particles, even after reaching a thermal-like state.
Area of Science:
- Quantum physics
- Condensed matter physics
- Many-body systems
Background:
- Interacting quantum many-body systems exhibit complex dynamics.
- Probing the full quantum state of large systems is experimentally challenging.
- Recurrences of quantum states are typically observed only in small systems.
Purpose of the Study:
- To demonstrate quantum state recurrences in a large, interacting quantum many-body system.
- To investigate the dynamics of coherence and long-range order in superfluids.
- To enable the study of coherent dynamics in systems beyond the smallest scales.
Main Methods:
- Realization of a commensurate spectrum of collective excitations.
- Utilizing one-dimensional superfluids.
- Observation of recurrences on the level of accessible observables.
Main Results:
- Demonstrated recurrences of coherence and long-range order.
- Studied an interacting quantum many-body system with thousands of particles.
- Confirmed recurrences in a system exhibiting a transient thermal-like state.
Conclusions:
- Quantum state recurrences can be observed in large interacting systems.
- The study opens new avenues for investigating coherent dynamics in macroscopic quantum systems.
- Findings are crucial for understanding quantum chaos and thermalization in many-body systems.
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