Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.220602
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Funding
- Slovenian Research Agency [P1-0044]
- Mebus Fellowship
- Max Planck Harvard Research Center for Quantum Optics
- National Science Foundation [PHY-1748958, PHY-1806428, PHY-1707482]
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Much has been learned about universal properties of entanglement entropies in ground states of quantum many-body lattice systems. Here we unveil universal properties of the average bipartite entanglement entropy of eigenstates of the paradigmatic quantum Ising model in one dimension. The leading term exhibits a volume-law scaling that we argue is universal for translationally invariant quadratic models. The subleading term is constant at the critical field for the quantum phase transition and vanishes otherwise (in the thermodynamic limit); i.e., the critical field can be identified from subleading corrections to the average (over all eigenstates) entanglement entropy.
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