Examining quantum correlations in the XY spin chain by local quantum uncertainty
| Autor: | Jin-Liang Guo, Jin-Long Wei, Qing-Xia Mu, Wan Qin |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Physics
Quantum phase transition Quantum discord Statistical and Nonlinear Physics Quantum entanglement Quantum phases Theoretical Computer Science Electronic Optical and Magnetic Materials Modeling and Simulation Quantum process Quantum mechanics Signal Processing Quantum operation Electrical and Electronic Engineering Quantum dissipation Amplitude damping channel |
| Zdroj: | Quantum Information Processing. 14:1429-1442 |
| ISSN: | 1573-1332 1570-0755 |
| DOI: | 10.1007/s11128-015-0933-0 |
| Popis: | We study the thermal quantum correlations in terms of entanglement, quantum discord (QD) and local quantum uncertainty (LQU) in the XY spin chain, and analyze their capability in detecting the critical points of quantum phase transition. By considering the effects of the three-site interaction, site distance, system size and anisotropy parameter, we show that LQU is superior to QD in detecting the critical points. The advantages of LQU are not to be restricted to zero temperature, and it is possible to estimate the critical points at high temperature. Furthermore, the properties of LQU are very interesting and exhibit different quantum correlations which cannot be shown by entanglement and QD. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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