Entanglement certification of attosecond light fields with photoelectron interferometry

@misc{stammer2026entanglement,
  title = {{Entanglement certification of attosecond light fields with photoelectron interferometry}},
  author = {Philipp Stammer},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.31187},
  eprint = {2610.31187},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.31187},
}

TY  - UNPB
TI  - Entanglement certification of attosecond light fields with photoelectron interferometry
AU  - Philipp Stammer
PY  - 2026
DA  - 2026/10/22
PB  - arXiv
DO  - 10.48550/arxiv.2610.31187
UR  - https://arxiv.org/abs/2610.31187
AB  - The emergence of entangled quantum optical states in high-harmonic generation raises a fundamental problem about its characterization, namely, \textit{how can entanglement of extreme-ultraviolet radiation be certified for attosecond light fields?} Here, we provide experimentally accessible separability tests, particularly showing that attosecond photoelectron interferometry provides a direct solution to this problem. This is achieved by a quantum optical treatment of mapping photoelectron interferometry to the measurement of optical correlation functions. This yields a negative-partial-transpose witness for infrared-XUV entanglement and a sufficient witness of genuine multipartite entanglement without auxiliary optical measurements. We evaluate both witnesses on explicit optical states and identify how the protocol can be extended to XUV-XUV entanglement certification. Hence, we establish attosecond photoelectron interferometry as a general framework for entanglement certification across a wide range of optical frequencies.
ER  -