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Quantum contextuality of a qutrit state

We present a study of quantum contextuality of three-dimensional mixed states for the Klyachko-Can-Binicioğlu-Shumovsky (KCBS) and the Kurzyński-Kaszlikowski (KK) noncontextuality inequalities. For any class of states whose eigenvalues are arranged in decreasing order, a universal set of measurements always exists for the KK inequality, whereas none does for the KCBS inequality. This difference can be reflected from the spectral distribution of the overall measurement matrix. Our results would facilitate the error analysis for experimental setups, and our spectral method in the paper combined with graph theory could be useful in future studies on quantum contextuality.

preprint2015arXivOpen access
Zhen-Peng XuHong-Yi SuJing-Ling Chen
quant-ph
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Open access3 authors1 topic
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Zhen-Peng XuHong-Yi SuJing-Ling Chen

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