Sharma-Mittal Quantum Discord

11/22/2018

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by   Souma Mazumdar, et al.

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We demonstrate a generalization of quantum discord using a generalized definition of von-Neumann entropy, which is Sharma-Mittal entropy; and the new definition of discord is called Sharma-Mittal quantum discord. Its analytic expressions are worked out for two qubit quantum states as well as Werner, isotropic, and pointer states as special cases. The Rényi, Tsallis, and von-Neumann entropy based quantum discords can be expressed as a limiting cases for of Sharma-Mittal quantum discord. We also numerically compare all these discords and entanglement negativity.