Quantum coherence and uncertainty in the anisotropic XY chain

Autor(es)

Karpat, G. ^[1] ; Cakmak, B. ^[2] ; Fanchini, F. F. ^[1]

Afiliação do(s) autor(es)

^[1] UNESP, Fac Ciencias, BR-17033360 Bauru, SP - Brazil

^[2] Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul - Turkey

• Tipo de documento: Artigo Científico
• Fonte: Physical Review B; v. 90, n. 10 SEP 30 2014.
• Citações Web of Science: 69

Resumo

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)

• Processo FAPESP: 08/57856-6 - Instituto Nacional de Ciência e Tecnologia em Informação Quântica
• Beneficiário: Amir Ordacgi Caldeira
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 12/18558-5 - Estudo das relações monogâmicas entre o emaranhamento e a correlação quântica
• Beneficiário: Goktug Karpat
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/50464-0 - Estudo das correlações quânticas em sistemas quânticos abertos
• Beneficiário: Felipe Fernandes Fanchini
• Modalidade de apoio: Auxílio à Pesquisa - Regular