Quantum correlations of three-qubit states driven by a classical random external field

• Published in: Physica scripta Vol. 90; no. 3; pp. 35103 - 8
• Main Authors: Guo, Youneng, Fang, Maofa, Zhang, Shiyang, Liu, Xiang
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.03.2015
• Subjects: Correlation; Correlation analysis; Death; Displays; Dynamics; Entanglement; entanglement witnesses; negativity; quantum discord; Qubits (quantum computing); Survival
• ISSN: 0031-8949; 1402-4896
• DOI: 10.1088/0031-8949/90/3/035103

In this paper, we exploit the notions of tripartite quantum discord , tripartite negativity , and entanglement witnesses (EWs), respectively, as a measure of quantum correlations in a model of three noninteracting qubits subject to a classical random external field. We compare the dynamics of with that of entanglement for the initial entangled pure or mixed GHZ- and W-type states. We find that the quantum correlations dynamics depend on the input configuration of the purity of the initial states. The results show that may be more robust than entanglement and no sudden death of the occurs, whereas entanglement displays periodically sudden death and revivals in the regions for GHZ- and W-type states driven by a classical random external field. Furthermore, we also show that the survival partial entanglement can be detected by means of the suitable EWs.