Abstract
We investigate the norms of Bloch vectors in four-partite quantum systems. An upper bound for the sum of the norms of three-order Bloch vectors has been obtained. We then present a trade-off relation of the Svetlichny inequality for any multipartite qubits systems by the upper bound. We show that for four-qubit systems, the reduced triple qubits cannot reach the maximal violate value simultaneously, while for any six-qubit state, the reduced triple qubits cannot violate Svetlichny inequality in the same time.
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This work is supported by the NSFC Nos. 11775306 and 11701568; the Fundamental Research Funds for the Central Universities Grant Nos. 16CX02049A, 17CX02033A and 18CX02023A; the Shandong Provincial Natural Science Foundation Nos. ZR2016AQ06 and ZR2017BA019
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Wang, Z., Qiao, J., Wang, J. et al. The norms of Bloch vectors and a trade-off relation of Svetlichny inequalities. Quantum Inf Process 17, 220 (2018). https://doi.org/10.1007/s11128-018-1990-y
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DOI: https://doi.org/10.1007/s11128-018-1990-y