The conditional quantum entropy is an entropy measure used in quantum information theory. It is a generalization of the conditional entropy of classical information theory. For a bipartite state, the conditional entropy is written, or, depending on the notation being used for the von Neumann entropy.
For the remainder of the article, we use the notation for the von Neumann entropy, which we simply call "entropy".
Read more about Conditional Quantum Entropy: Definition, Properties
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