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In quantum information theory, quantum discord is a measure of nonclassical correlations between two subsystems of a quantum system. It includes correlations that are due to quantum physical effects but do not necessarily involve quantum entanglement .
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where (‖) denotes quantum relative entropy. Note that there is an alternative generalization of mutual information to the quantum case. The difference between the two for a given state is called quantum discord, a measure for the quantum correlations of the state in question.
{{Quantum field theories}} {{Quantum gravity}} {{Quantum information}} This template's initial visibility currently defaults to autocollapse, meaning that if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute), it is hidden apart from its title bar; if not, it is fully visible.
Perhaps this template should be renamed to "Quantum field theory in HEP", or "Relativistic quantum field theory", and theirs should be called "Quantum field theory in condensed matter physics," or "non-relativistic quantum field theory." Actually, I feel that this template is too broad to be useful anyway; it needs to be split up.
The category quantum information science concerns information science that depends on quantum effects in physics. It includes theoretical issues in computational models as well as more experimental topics in quantum computing.