Abstract
With a two-step method of optimizing entanglement witness, we propose a set of necessary and sufficient entanglement criteria for four-qubit symmetric Greenberger–Horne–Zeilinger (GHZ) diagonal states. The criterion set contains four criteria. Two of them are linear with density matrix elements. The other two criteria are nonlinear with density matrix elements. The criterion set has a nest structure. A proper subset of the criteria is necessary and sufficient for entanglement of the corresponding subset of states. We illustrate the nest structure of criterion set with highly symmetric GHZ diagonal state set, its subset the general Werner state set and its superset the symmetric GHZ diagonal state set.
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Support from the National Natural Science Foundation of China (Grant Nos: 61871347 and 11375152) is gratefully acknowledged.
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Chen, Xy., Jiang, Lz. A hierarchy of entanglement criteria for four-qubit symmetric Greenberger–Horne–Zeilinger diagonal states. Quantum Inf Process 18, 262 (2019). https://doi.org/10.1007/s11128-019-2373-8
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DOI: https://doi.org/10.1007/s11128-019-2373-8