Experimental demonstration of the violations of Mermin’s and Svetlichny’s inequalities for W and GHZ states

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Violation of Mermin’s and Svetlichny’s inequalities can rule out the predictions of local hidden variable theory and can confirm the existence of true nonlocal correlation for n-particle pure quantum systems (\({n} \ge 3\)). Here we demonstrate the experimental violation of the above inequalities for W and GHZ state. We use IBM’s five-qubit quantum computer for experimental implementation of these states and illustration of inequalities’ violations. Our results clearly show the violations of both Mermin’s and Svetlichny’s inequalities for W and GHZ states, respectively. Being a superconducting qubit-based quantum computer, the platform used here opens up the opportunity to explore multipartite inequalities which is beyond the reach of other existing technologies.

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We acknowledge IBM team for providing free access to their cloud computing platform. The work presented here is only of the authors and does not include any technical contribution of IBM team.

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Correspondence to Bikash K. Behera.

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Swain, M., Rai, A., Behera, B.K. et al. Experimental demonstration of the violations of Mermin’s and Svetlichny’s inequalities for W and GHZ states. Quantum Inf Process 18, 218 (2019). https://doi.org/10.1007/s11128-019-2331-5

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  • IBM quantum experience
  • Mermin’s inequality
  • Svetlichny’s inequality