Power-law entanglement growth from typical product states

Talía L.M. Lezama, David J. Luitz

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Generic quantum many-body systems typically show a linear growth of the entanglement entropy after a quench from a product state. While entanglement is a property of the wave function, it is generated by the unitary time-evolution operator and is therefore reflected in its increasing complexity as quantified by the operator entanglement entropy. Using numerical simulations of a static and a periodically driven quantum spin chain, we show that there is a robust correspondence between the entanglement entropy growth of typical product states and the operator entanglement entropy of the unitary evolution operator, while special product states, e.g., σz basis states, can exhibit faster entanglement production. In the presence of a disordered magnetic field in our spin chains, we show that both the wave function and operator entanglement entropies exhibit a power-law growth with the same disorder-dependent exponent and clarify the apparent discrepancy in previous results. These systems, in the absence of conserved densities, provide further evidence for slow information spreading on the ergodic side of the many-body localization transition.

Original languageEnglish
Article number033067
JournalPhysical Review Research
Volume1
Issue number3
DOIs
StatePublished - 1 Nov 2019
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (all)

Fingerprint

Dive into the research topics of 'Power-law entanglement growth from typical product states'. Together they form a unique fingerprint.

Cite this