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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 .
Wojciech Hubert Zurek [1] (Polish: Żurek; born 1951) is a Polish and American theoretical physicist and a leading authority on quantum theory, especially decoherence and non-equilibrium dynamics of symmetry breaking and resulting defect generation (known as the Kibble–Zurek mechanism).
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.
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Ralph is known for developing continuous variable quantum cryptography [2] and co-founder of measurement based computation with continuous variable optics. [3] In 2012, Ralph was one of the scientists responsible for establishing quantum discord as a computational resource. [4] As of 2012, Tim has 200 publications and over 4500 citations.
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.
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