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Quantum Information Processing

, Volume 14, Issue 11, pp 4103–4112

First Online: 25 August 2015Received: 09 April 2015Accepted: 09 July 2015

Abstract

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.

KeywordsQuantum correlation Measure Manually calculable  Frobenius norm  Download fulltext PDF



Author: Hui Cao - Zhao-Qin Wu - Li-Yun Hu - Xue-Xiang Xu - Jie-Hui Huang

Source: https://link.springer.com/







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