Quantum entanglement as an extremal Kirkwood-Dirac nonreality

• URL: http://arxiv.org/abs/2501.04137v2
• Date: Sun, 19 Jan 2025 23:03:01 GMT
• Title: Quantum entanglement as an extremal Kirkwood-Dirac nonreality
• Authors: Agung Budiyono,
• Abstract summary: We discuss a link between quantum entanglement and the anomalous or nonclassical nonreal values of Kirkwood-Dirac (KD) quasiprobability. We first construct an entanglement monotone for a pure bipartite state based on the nonreality of the KD quasiprobability. We then construct a bipartite entanglement monotone for generic quantum states using the convex roof extension.
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• Abstract: Understanding the relationship between various different forms of nonclassicality and their resource character is of great importance in quantum foundation and quantum information. Here, we discuss a quantitative link between quantum entanglement and the anomalous or nonclassical nonreal values of Kirkwood-Dirac (KD) quasiprobability, in a bipartite setting. We first construct an entanglement monotone for a pure bipartite state based on the nonreality of the KD quasiprobability defined over a pair of orthonormal bases in which one of them is a product, and optimizations over these bases. It admits a closed expression as a Schur-concave function of the state of the subsystem having a form of nonadditive quantum entropy. We then construct a bipartite entanglement monotone for generic quantum states using the convex roof extension. Its normalized value is upper bounded by the concurrence of formation, and for two-qubit systems, they are equal. We also derive lower and upper bounds in terms of different forms of uncertainty in the subsystem quantified respectively by an extremal trace-norm asymmetry and a nonadditive quantum entropy. The entanglement monotone can be expressed as the minimum total state disturbance due to a nonselective local binary measurement. Finally, we discuss its estimation using weak value measurement and classical optimization, and its connection with strange weak value and quantum contextuality.

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