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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 .
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 mechanics is a fundamental theory that describes the behavior of nature at and below the scale of atoms. [2]: 1.1 It is the foundation of all quantum physics, which includes quantum chemistry, quantum field theory, quantum technology, and quantum information science.
In quantum information theory, quantum state merging [1] [2] is the transfer of a quantum state when the receiver already has part of the state. The process optimally transfers partial information using entanglement and classical communication.
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.
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Download as PDF; Printable version; In other projects ... Appearance. move to sidebar hide. Quantum field theory; Feynman diagram. History: Background. Field theory ...