Quantumness of Entanglement in Schwarzschild de Sitter Spacetime

@misc{wang2026quantumness,
  title = {{Quantumness of Entanglement in Schwarzschild de Sitter Spacetime}},
  author = {Sumeng Wang and Xiaofen Huang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.22761},
  eprint = {2610.22761},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.22761},
}

TY  - UNPB
TI  - Quantumness of Entanglement in Schwarzschild de Sitter Spacetime
AU  - Sumeng Wang
AU  - Xiaofen Huang
PY  - 2026
DA  - 2026/10/16
PB  - arXiv
DO  - 10.48550/arxiv.2610.22761
UR  - https://arxiv.org/abs/2610.22761
AB  - We investigate genuine multipartite entanglement and genuine tripartite nonlocality of a noisy generalized GHZ state in Schwarzschild-de Sitter spacetime. The genuine multipartite concurrence and optimized Svetlichny parameter are employed to characterize these two quantum correlations. It is shown that the black hole and cosmological event horizons redistribute genuine multipartite entanglement differently among the physically accessible and inaccessible reduced states, while Svetlichny violation occurs only in the physically accessible state. We find that genuine multipartite entanglement can survive in the physically inaccessible states even when genuine tripartite nonlocality is absent. In addition, initial white noise suppresses both correlations, with Svetlichny nonlocality surviving over a narrower parameter region. Furthermore, in the Nariai limit, under the normalization adopted here, the correlations become concentrated in the physically accessible state. These results demonstrate the different robustness of genuine multipartite entanglement and genuine tripartite nonlocality under horizon effects and initial noise.
ER  -