Corpus ID: 227254337

Efficient Algorithms for Causal Order Discovery in Quantum Networks

@article{Bai2020EfficientAF,
  title={Efficient Algorithms for Causal Order Discovery in Quantum Networks},
  author={Ge Bai and Ya-Dong Wu and Yan Zhu and Masahito Hayashi and Giulio Chiribella},
  journal={arXiv: Quantum Physics},
  year={2020}
}
Given black-box access to the input and output systems, we develop the first efficient quantum causal order discovery algorithm with polynomial query complexity with respect to the number of systems. We model the causal order with quantum combs, and our algorithms output the order of inputs and outputs that the given process is compatible with. Our algorithm searches for the last input and the last output in the causal order, removes them, and iteratively repeats the above procedure until we… Expand

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