TY - JOUR

T1 - Entanglement Entropy of Eigenstates of Quantum Chaotic Hamiltonians

AU - Vidmar, Lev

AU - Rigol, Marcos

N1 - Funding Information:
This work was supported by the Office of Naval Research, Grant No. N00014-14-1-0540. We acknowledge discussions with Lucas Hackl and Eugenio Bianchi. The computations were done at the Institute for CyberScience at Penn State.
Publisher Copyright:
© 2017 American Physical Society.

PY - 2017/11/29

Y1 - 2017/11/29

N2 - In quantum statistical mechanics, it is of fundamental interest to understand how close the bipartite entanglement entropy of eigenstates of quantum chaotic Hamiltonians is to maximal. For random pure states in the Hilbert space, the average entanglement entropy is known to be nearly maximal, with a deviation that is, at most, a constant. Here we prove that, in a system that is away from half filling and divided in two equal halves, an upper bound for the average entanglement entropy of random pure states with a fixed particle number and normally distributed real coefficients exhibits a deviation from the maximal value that grows with the square root of the volume of the system. Exact numerical results for highly excited eigenstates of a particle number conserving quantum chaotic model indicate that the bound is saturated with increasing system size.

AB - In quantum statistical mechanics, it is of fundamental interest to understand how close the bipartite entanglement entropy of eigenstates of quantum chaotic Hamiltonians is to maximal. For random pure states in the Hilbert space, the average entanglement entropy is known to be nearly maximal, with a deviation that is, at most, a constant. Here we prove that, in a system that is away from half filling and divided in two equal halves, an upper bound for the average entanglement entropy of random pure states with a fixed particle number and normally distributed real coefficients exhibits a deviation from the maximal value that grows with the square root of the volume of the system. Exact numerical results for highly excited eigenstates of a particle number conserving quantum chaotic model indicate that the bound is saturated with increasing system size.

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U2 - 10.1103/PhysRevLett.119.220603

DO - 10.1103/PhysRevLett.119.220603

M3 - Article

C2 - 29286792

AN - SCOPUS:85037683434

SN - 0031-9007

VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

IS - 22

M1 - 220603

ER -