Pairwise correlations via quantum discord and its geometric measure in a four-qubit spin chain | ||
| Journal of the Egyptian Mathematical Society | ||
| Volume 21, Issue 1, April 2013, Pages 68-74 PDF (1016.89 K) | ||
| Document Type: Original Article | ||
| DOI: 10.1016/j.joems.2012.10.005 | ||
| Author | ||
| Abdel-Baset A. Mohamed* | ||
| Faculty of Science, Assiut University, Assiut 71516, Egypt Al-Aflaj Community College, Salman Bin Abdulaziz University, Saudi Arabia | ||
| 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. | ||
| Keywords | ||
| Pairwise correlations; Quantum discord; Spin chain model | ||
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