This research confirms a negative expectation value for multipartite entanglement in Dicke states on IBM QPU, indicating the effectiveness of error mitigation techniques.
An entanglement witness is necessary to characterize genuine multipartite entan-gled states. We theoretically derive the entanglement witness for the four-qubit Dicke state. A negative expectation value confirms genuine multipartite entanglement. Our witness was experimentally verified on IBM QPU, with and without error mitigation techniques.
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Prajapati et al. (2025) studied this question.
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