Universal limitations on quantum key distribution over a network

@article{Das2021UniversalLO,
  title={Universal limitations on quantum key distribution over a network},
  author={Siddhartha Das and Stefan B{\"a}uml and Marek Winczewski and Karol Horodecki},
  journal={ArXiv},
  year={2021},
  volume={abs/1912.03646}
}
The possibility to achieve secure communication among trusted parties by means of the quantum entanglement is intriguing both from a fundamental and an application purpose. In this work, we show that any state (after distillation) from which a quantum secret key can be obtained by local measurements has to be genuinely multipartite entangled. We introduce the most general form of memoryless network quantum channel: quantum multiplex channels. We define and determine asymptotic and non… 

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