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In quantum information theory, entropic inequalities act as the necessary andsufficient conditions to noncontextuality. Here, we first experimentallydemonstrate the violation of the entropic noncontextual inequality in afour-level quantum system, by using the five-qubit IBM quantum computer. Theexperimental result disproves the existence of a local realist model.

Experimental Realization of Quantum Violation of Entropic Noncontextual Inequality in Four Dimension Using IBM Quantum Computer