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arxiv: quant-ph/9605038 · v2 · submitted 1996-05-28 · 🪐 quant-ph

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Separability of Mixed States: Necessary and Sufficient Conditions

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classification 🪐 quant-ph
keywords separabilitynecessarysufficientconditionscriterionmixedstatescase
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We provide necessary and sufficient conditions for separability of mixed states. As a result we obtain a simple criterion of separability for $2\times2$ and $2\times3$ systems. Here, the positivity of the partial transposition of a state is necessary and sufficient for its separability. However, it is not the case in general. Some examples of mixtures which demonstrate the utility of the criterion are considered.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Separability from Multipartite Measures

    quant-ph 2026-05 unverdicted novelty 5.0

    Third-order negativity is a necessary and sufficient criterion for full separability of tripartite pure states and extends to mixed states and qudits.

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    Multiple Unruh-DeWitt detectors harvest more vacuum entanglement when arranged in specific configurations, with harvested negativity scaling linearly in linear chains.

  3. Separability from Multipartite Measures

    quant-ph 2026-05 unverdicted novelty 4.0

    Third-order negativity provides a necessary and sufficient criterion for full separability of tripartite pure states, with generalizations to mixed states, qudits, and an application to conformal field theory.