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Entanglement witnesses with local partial ordering (2409.17689v1)
Published 26 Sep 2024 in quant-ph
Abstract: We investigate a class of entanglement witnesses where each witness is formulated as a difference of two product observables. These observables are decomposable into positive semidefinite local operators that obey a partial ordering rule defined over all their possible expectation values. We provide a framework to construct these entanglement witnesses along with some examples. We also discuss methods to improve them both linearly and nonlinearly.
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