Spurious longrange entanglement and replica correlation length
Abstract
Topological entanglement entropy has been regarded as a smokinggun signature of topological order in two dimensions, capturing the total quantum dimension of the topological particle content. An extrapolation method on cylinders has been used frequently to measure the topological entanglement entropy. Here in this paper, we show that a class of shortrange entangled 2D states, when put on an infinite cylinder of circumference L , exhibits the entanglement Rényi entropy of any integer index α ≥ 2 that obeys S_{α} = a Lγ , where α, γ > 0 . Under the extrapolation method, the subleading term γ would be identified as the topological entanglement entropy, which is spurious. A nonzero γ is always present if the 2D state reduces to a certain symmetryprotected topological 1D state, upon disentangling spins that are far from the entanglement cut. The internal symmetry that stabilizes γ > 0 is not necessarily a symmetry of the 2D state, but should be present after the disentangling reduction. If the symmetry is absent, γ decays exponentially in L with a characteristic length, termed as a replica correlation length, which can be arbitrarily large compared to the twopoint correlation length of the 2D state. We propose amore »
 Authors:

 Harvard Univ., Cambridge, MA (United States). Dept. of Physics
 Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
 Publication Date:
 Research Org.:
 Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1505757
 Alternate Identifier(s):
 OSTI ID: 1306698
 Grant/Contract Number:
 SC0008739
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 94; Journal Issue: 7; Journal ID: ISSN 24699950
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Zou, Liujun, and Haah, Jeongwan. Spurious longrange entanglement and replica correlation length. United States: N. p., 2016.
Web. doi:10.1103/physrevb.94.075151.
Zou, Liujun, & Haah, Jeongwan. Spurious longrange entanglement and replica correlation length. United States. doi:10.1103/physrevb.94.075151.
Zou, Liujun, and Haah, Jeongwan. Thu .
"Spurious longrange entanglement and replica correlation length". United States. doi:10.1103/physrevb.94.075151. https://www.osti.gov/servlets/purl/1505757.
@article{osti_1505757,
title = {Spurious longrange entanglement and replica correlation length},
author = {Zou, Liujun and Haah, Jeongwan},
abstractNote = {Topological entanglement entropy has been regarded as a smokinggun signature of topological order in two dimensions, capturing the total quantum dimension of the topological particle content. An extrapolation method on cylinders has been used frequently to measure the topological entanglement entropy. Here in this paper, we show that a class of shortrange entangled 2D states, when put on an infinite cylinder of circumference L , exhibits the entanglement Rényi entropy of any integer index α ≥ 2 that obeys Sα = a Lγ , where α, γ > 0 . Under the extrapolation method, the subleading term γ would be identified as the topological entanglement entropy, which is spurious. A nonzero γ is always present if the 2D state reduces to a certain symmetryprotected topological 1D state, upon disentangling spins that are far from the entanglement cut. The internal symmetry that stabilizes γ > 0 is not necessarily a symmetry of the 2D state, but should be present after the disentangling reduction. If the symmetry is absent, γ decays exponentially in L with a characteristic length, termed as a replica correlation length, which can be arbitrarily large compared to the twopoint correlation length of the 2D state. We propose a simple numerical procedure to measure the replica correlation length through replica correlation functions. We also calculate the replica correlation functions for representative wave functions of Abelian discrete gauge theories and the double semion theory in 2D, to show that they decay abruptly to zero. This supports a conjecture that the replica correlation length being small implies that the subleading term from the extrapolation method determines the total quantum dimension.},
doi = {10.1103/physrevb.94.075151},
journal = {Physical Review B},
number = 7,
volume = 94,
place = {United States},
year = {2016},
month = {8}
}
Web of Science
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