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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Quantum coherence and uncertainty in the anisotropic XY chain

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Author(s):
Karpat, G. [1] ; Cakmak, B. [2] ; Fanchini, F. F. [1]
Total Authors: 3
Affiliation:
[1] UNESP, Fac Ciencias, BR-17033360 Bauru, SP - Brazil
[2] Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul - Turkey
Total Affiliations: 2
Document type: Journal article
Source: Physical Review B; v. 90, n. 10 SEP 30 2014.
Web of Science Citations: 77
Abstract

We explore the local quantum coherence and the local quantum uncertainty, based on Wigner-Yanase skew information, in the ground state of the anisotropic spin-1/2 XY chain in a transverse magnetic field. We show that the skew information, as a figure of merit, supplies the necessary information to reveal the occurrence of the second-order phase transition and the completely factorized ground state in the XY model. Additionally, in the same context, we also discuss the usefulness of a simple experimentally friendly lower bound of local quantum coherence. Furthermore, we demonstrate how the connection between the appearance of nonanalyticities in the local quantum uncertainty of the ground state and the quantum phase transitions does not hold in general, by providing explicit examples of the situation. Lastly, we discuss the ability of the local quantum coherence to accurately estimate the critical point of the phase transition, and we investigate the robustness of the factorization phenomenon at low temperatures. (AU)

FAPESP's process: 12/50464-0 - A study of quantum correlations in open quantum systems
Grantee:Felipe Fernandes Fanchini
Support type: Regular Research Grants
FAPESP's process: 08/57856-6 - National Institute of Science and Technology - Quantum Information
Grantee:Amir Ordacgi Caldeira
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/18558-5 - Studying the monogamic relations between entanglement and quantum correlations
Grantee:Goktug Karpat
Support type: Scholarships in Brazil - Post-Doctorate