On the equivalence between SAPPT and SAS states

• URL: http://arxiv.org/abs/2411.16461v1
• Date: Mon, 25 Nov 2024 15:06:52 GMT
• Title: On the equivalence between SAPPT and SAS states
• Authors: Jonathan Louvet, Eduardo Serrano-Ensástiga, Thierry Bastin, John Martin,
• Abstract summary: equivalence between absolutely separable (AS) states and absolutely positive partial transposed (APPT) states in general remains an open problem in quantum entanglement theory. We show that SAPPT states are not always symmetric absolutely separable (SAS) by providing explicit counterexamples.
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• Abstract: The equivalence between absolutely separable (AS) states and absolutely positive partial transposed (APPT) states in general remains an open problem in quantum entanglement theory. In this work, we study an analogous question for symmetric multiqubit states. We show that SAPPT states (symmetric states that remain PPT after any symmetry-preserving unitary evolution) are not always symmetric absolutely separable (SAS) by providing explicit counterexamples. More precisely, we construct a family of entangled 5-qubit SAPPT states. Similar counterexamples for larger odd numbers of qubits are identified.

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