Entanglement growth and simulation efficiency in one-dimensional quantum lattice systems

Perales, Alvaro and Vidal, Guifre (2008) Entanglement growth and simulation efficiency in one-dimensional quantum lattice systems. Physical Review A, 78 4: 042337-1-042337-6. doi:10.1103/PhysRevA.78.042337

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Author Perales, Alvaro
Vidal, Guifre
Title Entanglement growth and simulation efficiency in one-dimensional quantum lattice systems
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2008-10-31
Sub-type Article (original research)
DOI 10.1103/PhysRevA.78.042337
Open Access Status File (Publisher version)
Volume 78
Issue 4
Start page 042337-1
End page 042337-6
Total pages 6
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract We have synthesized a compound ideally suited to the study of structure-function relationships in eumelanin synthesis. N-methyl-5-hydroxy-6-methoxy-indole (MHMI) has key functional groups strategically placed on the indole framework to hinder binding in the 2, 5, 6 and 7 positions. Thus, the dimer bound exclusively in the 4-4' positions was isolated and characterized. In order to study the difference in vibrational structure between the MHMI monomer and dimer, Raman spectra were acquired of both compounds, as well as indole, indole-2-carboxylic acid and 5,6-dihydroxyindole-2-carboxylic acid (DHICA). Peaks were assigned to particular vibrational modes using B3LYP density functional theory calculations, and experimental and theoretical spectra displayed good agreement. Addition of functional groups to either benzene or pyrrole rings in the indole framework impacted vibrational spectra attributed to vibrations in either ring, and in some cases, peaks appearing unchanged between two compounds corresponded to different contributing vibrations. Dimerization resulted in an expected increase in the number of vibrational modes, but not a significant increase in the number of apparent peaks, as several modes frequently contributed to an individual observed peak. Comparison of spectral features of the monomer and dimer provides insight into eumelanin photochemistry, but final conclusions depend on the planarity of oligomeric structure in vivo.
Keyword Ground states
Matrix algebra
Quantum entanglement
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article #042337

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 17 Mar 2009, 01:37:38 EST by Jo Hughes on behalf of School of Mathematics & Physics