Quantum

Quantumness of entanglement in Schwarzschild-de Sitter spacetime

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Briefings

A 2026 arXiv preprint investigates genuine multipartite entanglement and tripartite nonlocality in Schwarzschild-de Sitter spacetime. The study finds that black and cosmological horizons redistribute entanglement differently between accessible and inaccessible states, with Svetlichny violation restricted to accessible states. Genuine multipartite entanglement can persist in inaccessible states even when nonlocality is absent, and initial white noise suppresses correlations, with Svetlichny surviving in a narrower parameter range. Results show correlations concentrate in accessible states under the Nariai limit.

Key points

• Genuine multipartite entanglement survives in physically inaccessible states even when genuine tripartite nonlocality is absent.
• Svetlichny nonlocality occurs only in physically accessible states, while genuine multipartite entanglement persists in inaccessible states.

Context

This research examines quantum correlations in a cosmological black hole environment using a generalized GHZ state in Schwarzschild-de Sitter spacetime, revealing how horizons and noise affect quantum correlations.

Limitations

The study relies on a single arXiv preprint with limited experimental validation; results are theoretical and subject to further testing.

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