Faculty of Science, Assiut University, Assiut 71516, Egypt Al-Aflaj Community College, Salman Bin Abdulaziz University, Saudi Arabia
http://dx.doi.org/10.1016/j.joems.2012.10.005
Abstract
The dynamic of pairwise correlations, including quantum entanglement (QE) and discord (QD) with geometric measure of quantum discord (GMQD), are shown in the four-qubit Heisenberg XX spin chain. The results show that the effect of the entanglement degree of the initial state on the pairwise correlations is stronger for alternate qubits than it is for nearest-neighbor qubits. This parameter results in sudden death for QE, but it cannot do so for QD and GMQD. With different values for this entanglement parameter of the initial state, QD and GMQD differ and are sensitive for any change in this parameter. It is found that GMQD is more robust than both QD and QE to describe correlations with nonzero values, which offers a valuable resource for quantum computation.
Mohamed, A. A. (2013). Pairwise correlations via quantum discord and its geometric measure in a four-qubit spin chain. Journal of the Egyptian Mathematical Society, 21(1), 68-74. doi: http://dx.doi.org/10.1016/j.joems.2012.10.005
MLA
Abdel-Baset A. Mohamed. "Pairwise correlations via quantum discord and its geometric measure in a four-qubit spin chain". Journal of the Egyptian Mathematical Society, 21, 1, 2013, 68-74. doi: http://dx.doi.org/10.1016/j.joems.2012.10.005
HARVARD
Mohamed, A. A. (2013). 'Pairwise correlations via quantum discord and its geometric measure in a four-qubit spin chain', Journal of the Egyptian Mathematical Society, 21(1), pp. 68-74. doi: http://dx.doi.org/10.1016/j.joems.2012.10.005
VANCOUVER
Mohamed, A. A. Pairwise correlations via quantum discord and its geometric measure in a four-qubit spin chain. Journal of the Egyptian Mathematical Society, 2013; 21(1): 68-74. doi: http://dx.doi.org/10.1016/j.joems.2012.10.005
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