# Cyclic Quantum Causal Models

@article{Barrett2020CyclicQC, title={Cyclic Quantum Causal Models}, author={Jonathan Barrett and Robin Lorenz and Ognyan Oreshkov}, journal={arXiv: Quantum Physics}, year={2020} }

We present an extension of the framework of quantum causal models to cyclic causal structures. This offers a novel causal perspective on processes beyond those corresponding to standard circuits, such as processes with dynamical causal order and causally nonseparable processes, including processes that violate causal inequalities. We illustrate the concept with examples of well known causally nonseparable processes. We show that for any directed graph, if a process arises from a unitary process… CONTINUE READING

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