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PreprintarXiv licencearXiv

Separating entanglement at emission from femtoscopic correlations

  • Isaac Vidaña
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Abstract

We investigate how femtoscopic correlations modify the relation between the spin entanglement of emitted particle pairs and that of pairs selected at a given relative momentum. For two spin-1/2 particles, we show that the momentum-selected spin state can be entangled even when the corresponding state at emission is separable. We derive a momentum-dependent separability criterion that determines whether the observed spin correlations require entanglement at emission. As an application, we consider a pair of identical Λ hyperons, for which quantum statistics and final-state interactions affect the singlet and triplet spin channels differently at low relative momentum. Our results provide a framework for using experimentally accessible spin correlations to investigate entanglement at emission.

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Cite

BibTeXRIS
BibTeX
@misc{vidana2026separating,
  title = {{Separating entanglement at emission from femtoscopic correlations}},
  author = {Isaac Vidaña},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.14358},
  eprint = {2610.14358},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.14358},
}
RIS
TY  - UNPB
TI  - Separating entanglement at emission from femtoscopic correlations
AU  - Isaac Vidaña
PY  - 2026
DA  - 2026/10/09
PB  - arXiv
DO  - 10.48550/arxiv.2610.14358
UR  - https://arxiv.org/abs/2610.14358
AB  - We investigate how femtoscopic correlations modify the relation between the spin entanglement of emitted particle pairs and that of pairs selected at a given relative momentum. For two spin-1/2 particles, we show that the momentum-selected spin state can be entangled even when the corresponding state at emission is separable. We derive a momentum-dependent separability criterion that determines whether the observed spin correlations require entanglement at emission. As an application, we consider a pair of identical Λ hyperons, for which quantum statistics and final-state interactions affect the singlet and triplet spin channels differently at low relative momentum. Our results provide a framework for using experimentally accessible spin correlations to investigate entanglement at emission.
ER  -