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Emergent SU(2) Dynamics and Perfect Quantum Many-Body Scars
Soonwon Choi1, Christopher J Turner2, Hannes Pichler3,4
1Department of Physics, University of California Berkeley, Berkeley, California 94720, USA.
Physical Review Letters
|July 9, 2019
Summary
Researchers engineered a modified Rydberg atom chain to achieve nearly perfect many-body revivals. This work reveals quantum many-body scars as key to understanding these phenomena and enhancing quantum dynamics.
Area of Science:
- Quantum physics
- Atomic physics
- Condensed matter theory
Background:
- Recent experiments observed coherent many-body revivals in constrained Rydberg atom chains.
- Understanding the mechanisms behind these revivals is crucial for quantum dynamics control.
Purpose of the Study:
- To theoretically investigate and enhance coherent many-body revivals in Rydberg atom systems.
- To explore the role of quantum many-body scars in emergent quantum dynamics.
Main Methods:
- Constructing a weak quasilocal deformation of the Rydberg-blockaded Hamiltonian.
- Analyzing the emergent SU(2)-spin dynamics within a specific subspace.
- Developing a toy model exhibiting exact quantum many-body scars.
Main Results:
- The engineered Hamiltonian leads to virtually perfect many-body revivals.
- Identified atypical, nonergodic energy eigenstates, termed quantum many-body scars, as essential for perfect dynamics.
- Demonstrated an intuitive model for the origin of quantum many-body scars.
Conclusions:
- Quantum many-body scars are pivotal for achieving enhanced coherent many-body revivals.
- The findings provide a pathway for stabilizing quantum many-body scars in the thermodynamic limit.
- Offers insights into controlling complex quantum systems through Hamiltonian engineering.
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