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This research extends the analysis of quantum nonlocality sharing to $n$-qubit GHZ systems, demonstrating that unbiased unsharp measurements optimize qubit recycling for generating genuine multipartite nonlocality. The study reveals a key distinction between unilateral and multilateral sequential measurement scenarios, where the former allows for limited sharing (e.g., two copies for a four-qubit state) while the latter yields no additional advantage. These findings provide theoretical bounds for future quantum network protocols involving sequential observer interactions.
Genuine Multipartite Nonlocality sharing under sequential measurement
arXiv:2501.10274v3 Announce Type: replace Abstract: The study of quantum nonlocality sharing has garnered significant attention, particularly for two-qubit and three-qubit entangled systems. In this paper, we extend the investigation to $n$-qubit Greenberger-Horne-Zeilinger (GHZ) systems, analyzing nonlocality sharing under unbiased unsharp measurements. Employing the Seevink and Svetlichny inequalities, we explore both unilateral and multilateral sequential measurement scenarios. In the unilateral scenario, we derive the range for which an observer's multiple copies can share genuine $n$-partite nonlocality with single copies of the remaining parties. In the multilateral scenario, we identify the maximum number of independent observers on $m$ sides who can share genuine $n$-partite nonlocality with other parties. A crucial aspect of our results is that all findings stem from a measurement strategy where each sequential observer utilizes unbiased unsharp measurements. As a specific case, for the four-qubit maximally entangled GHZ state, we demonstrate that at most two copies of an observer (e.g., Alice) can share nonlocality in the unilateral sequential measurement scenario. However, in the multilateral scenario, no additional sharing is possible compared to the unilateral case. This finding highlights the significance of unsharp measurements in optimizing the recycling of qubits for generating quantum nonlocality.
Abstract:The study of quantum nonlocality sharing has garnered significant attention, particularly for two-qubit and three-qubit entangled systems. In this paper, we extend the investigation to $n$-qubit Greenberger-Horne-Zeilinger (GHZ) systems, analyzing nonlocality sharing under unbiased unsharp measurements. Employing the Seevink and Svetlichny inequalities, we explore both unilateral and multilateral sequential measurement scenarios. In the unilateral scenario, we derive the range for which an observer's multiple copies can share genuine $n$-partite nonlocality with single copies of the remaining parties. In the multilateral scenario, we identify the maximum number of independent observers on $m$ sides who can share genuine $n$-partite nonlocality with other parties. A crucial aspect of our results is that all findings stem from a measurement strategy where each sequential observer utilizes unbiased unsharp measurements. As a specific case, for the four-qubit maximally entangled GHZ state, we demonstrate that at most two copies of an observer (e.g., Alice) can share nonlocality in the unilateral sequential measurement scenario. However, in the multilateral scenario, no additional sharing is possible compared to the unilateral case. This finding highlights the significance of unsharp measurements in optimizing the recycling of qubits for generating quantum nonlocality.
arXiv:2501.10274 [quant-ph]
(or arXiv:2501.10274v3 [quant-ph] for this version)
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