Quantifying information flow in quantum processes
arxiv(2024)
摘要
We present a framework for quantifying information flow within general
quantum processes. For this purpose, we introduce the signaling power of
quantum channels and discuss its relevant operational properties. This function
supports extensions to higher order maps, enabling the evaluation of
information flow in general quantum causal networks and also processes with
indefinite causal order. Furthermore, our results offer a rigorous approach to
information dynamics in open systems that applies also in the presence of
initial system-environment correlations, and allows for the distinction between
classical and quantum information backflow.
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