Abstract
In this work we study the entanglement of pure four-qubit quantum states. The analysis is realized, firstly, through the comparison between two different entanglement measures: the Groverian entanglement measure and the residual entanglement calculated with negativities. After, we use the last to measure the entanglement of several four-qubit states and the variation of the entanglement when the four-qubit state is processed by a two-qubit gate.
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Oliveira, D.S., Ramos, R.V. Residual entanglement with negativity for pure four-qubit quantum states. Quantum Inf Process 9, 497–508 (2010). https://doi.org/10.1007/s11128-009-0154-5
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DOI: https://doi.org/10.1007/s11128-009-0154-5