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Super-quantum correlation for SU(2) invariant state in \(4\otimes 2\) system

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Abstract

We analytically evaluate the weak one-way deficit and super-quantum discord for a system composed of spin-3/2 and spin-1/2 subsystems possessing SU(2) symmetry. We also make a comparative study of the relationships among the quantum discord, one-way deficit, weak one-way deficit, and super-quantum discord for the SU(2) invariant state. It is shown that super-quantum discord via weak measurement is greater than that via von Neumann measurement. But weak one-way deficit is less than the one-way deficit. As a result, weak measurement do not always reveal more quantumness.

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Authors and Affiliations

  1. Department of Mathematics, College of Sciences, Yanbian University, Yanji, 133002, China

    Lin-Song Li, Yuan-Hong Tao, Hua Nan & Hui Xu

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  1. Lin-Song Li
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  2. Yuan-Hong Tao
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  3. Hua Nan
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  4. Hui Xu
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Correspondence to Lin-Song Li.

Additional information

This work is supported by Natural Science Foundation of China under Numbers 11361065 and 11761073.

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Li, LS., Tao, YH., Nan, H. et al. Super-quantum correlation for SU(2) invariant state in \(4\otimes 2\) system. Quantum Inf Process 17, 86 (2018). https://doi.org/10.1007/s11128-017-1789-2

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