Pairwise correlations via quantum discord and its geometric measure in a four-qubit spin chain | Zendy

Abdel-Baset A. Mohamed | Zendy

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Pairwise correlations via quantum discord and its geometric measure in a four-qubit spin chain

Author(s) -

Abdel-Baset A. Mohamed

Publication year - 2012

Publication title -

journal of the egyptian mathematical society

Language(s) - English

Resource type - Journals

eISSN - 2090-9128

pISSN - 1110-256X

DOI - 10.1016/j.joems.2012.10.005

Subject(s) - qubit , quantum entanglement , quantum discord , pairwise comparison , measure (data warehouse) , mathematics , quantum mechanics , quantum correlation , spin (aerodynamics) , pairwise independence , statistical physics , physics , quantum , statistics , probability distribution , computer science , database , thermodynamics , algebra of random variables , moment generating function

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

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