An easy measure of quantum correlation

An easy measure of quantum correlation To measure the quantum correlation of a bipartite state, a test matrix is constructed through the commutations among the blocks of its density matrix, which turns out to be a zero matrix for a classical state with zero quantum correlation, and a nonzero one for a quantum state with positive quantum correlation. The Frobenius norm of the test matrix is used to measure the quantum correlation, which satisfies the basic requirements for a good measure and coincides with Wootters concurrence for two-qubit pure states. Since no optimization is involved in the definition, this measure of quantum correlation is easy to compute and even can be calculated manually. Quantum Information Processing Springer Journals

An easy measure of quantum correlation

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Springer US
Copyright © 2015 by The Author(s)
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
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    Guo, JL; Li, H; Long, GL
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  • Geometric measure of quantum discord
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  • Analytic expressions of discord and geometric discord in Werner derivatives
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