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Analysing nonlocality robustness in multiqubit systems under noisy conditions and weak measurements
P. Singh,
Published in Springer New York LLC
Volume: 17
Issue: 9
We analyse robustness of nonlocal correlation in multiqubit entangled states—three- and four-qubit GHZ class and three-qubit W class—useful for quantum information and computation, under noisy conditions and weak measurements. For this, we use a Bell-type inequality whose violation is considered as a signature for confirming the presence of genuine nonlocal correlations between the qubits. In order to demonstrate the effects of noise and weak measurements, an analytical relation is established between the maximum expectation value of three and four-qubit Svetlichny operators for the systems under study, noise parameter and strengths of weak measurements. Our results show that for a set of three- and four-qubit GHZ class states, maximal nonlocality does not coincide with maximum entanglement for a given noise parameter and a certain range of weak measurement parameter. Our analysis further shows an excellent agreement between the analytical and numerical results. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.
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JournalData powered by TypesetQuantum Information Processing
PublisherData powered by TypesetSpringer New York LLC
Open AccessNo