Quantum information theory | Quantum mechanical entropy

Joint quantum entropy

The joint quantum entropy generalizes the classical joint entropy to the context of quantum information theory. Intuitively, given two quantum states and , represented as density operators that are subparts of a quantum system, the joint quantum entropy is a measure of the total uncertainty or entropy of the joint system. It is written or , depending on the notation being used for the von Neumann entropy. Like other entropies, the joint quantum entropy is measured in bits, i.e. the logarithm is taken in base 2. In this article, we will use for the joint quantum entropy. (Wikipedia).

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Related pages

Information theory | Density matrix | Borel functional calculus | Bell state | Quantum entanglement | Partial trace | Quantum mutual information | Random variable | Joint entropy | Entropy | Mutual information | Quantum relative entropy | Spectral theorem | Von Neumann entropy | Conditional entropy | Bit | Conditional quantum entropy