Abstract
We study the norms of the Bloch vectors for arbitrary n-partite quantum states. A tight upper bound of the norms is derived for n-partite systems with different individual dimensions. These upper bounds are used to deal with the separability problems. Necessary conditions are presented for \(\mathbf {m}\)-separable states in n-partite quantum systems. Based on the upper bounds, classification of multipartite entanglement is illustrated with detailed examples.
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Acknowledgements
This work is supported by the NSF of China under Grant Nos. 11571119 and 11675113, the Key Project of Beijing Municipal Commission of Education (Grant No. KZ201810028042), and Beijing Natural Science Foundation (Z190005). It is a pleasure to thank Jin-Wei Huang for helpful discussion.
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Xu, W., Zhu, CJ., Zheng, ZJ. et al. Necessary conditions for classifying \(\mathbf {m}\)-separability of multipartite entanglements. Quantum Inf Process 19, 200 (2020). https://doi.org/10.1007/s11128-020-02705-6
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DOI: https://doi.org/10.1007/s11128-020-02705-6