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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Extensive Multipartite Entanglement from su(2) Quantum Many-Body Scars
Jean-Yves Desaules1, Francesca Pietracaprina2, Zlatko Papić1
1School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom.
Physical Review Letters
|July 22, 2022
Summary
Quantum many-body scars exhibit unique multipartite entanglement, unlike generic thermal states. This finding in Rydberg atom quantum simulators highlights their potential for quantum-enhanced metrology.
Area of Science:
- Quantum physics
- Quantum information science
- Condensed matter physics
Background:
- Quantum many-body scars are eigenstates that evade thermalization in quantum systems.
- These scars exhibit unique entanglement properties, such as subvolume bipartite entanglement.
- Understanding their structure is key to exploring novel quantum phenomena.
Purpose of the Study:
- To investigate the multipartite entanglement structure of exact many-body scars.
- To analyze the role of su(2) spectrum generating algebra in scar properties.
- To explore the potential of these states in quantum-enhanced metrology.
Main Methods:
- Analytical demonstration of superextensive quantum Fisher information for exact scarred eigenstates.
- Numerical studies of multipartite entanglement signatures in the PXP model.
- Global quench experiments to induce extensive quantum Fisher information density.
Main Results:
- Exact many-body scars stemming from an su(2) algebra possess extensive multipartite entanglement.
- Quantum Fisher information scales superextensively for scarred eigenstates, contrasting with thermal states.
- Global quenches in the PXP model dynamically generate extensive quantum Fisher information density.
Conclusions:
- Scarred states exhibit rich multipartite correlation structures.
- These structures are distinct from those in generic thermal states.
- Scarred states represent a valuable resource for quantum-enhanced metrology.
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