Comment on: Multipartite entanglement in four-qubit graph state
Haddadi, Saeed
Original · EN
The following comment is based on an article by M. Jafarpour and L. Assadi [Eur. Phys. J. D 70, 62 (2016), doi:10.1140/epjd/e2016-60555-5] which with an exploitation of Scott measure (or generalized Meyer-Wallach measure) the entanglement quantity of four-qubit graph states has been calculated. We are to reveal that the Scott measure (Qₘ) nominates limits for m which would prevent us from calculating Q₃ in four-qubit system. Incidentally in a counterexample we will confirm as it was recently concluded in the mentioned article, the Q₂ quantity is not necessarily always greater than Q₃.
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