Symmetric 3 Qubit State Invariants

  title={Symmetric 3 Qubit State Invariants},
  author={Alexander Meill and David A. Meyer},
For pure symmetric 3-qubit states there are only three algebraically independent entanglement measures; one choice is the pairwise concurrence $\mathcal C$, the 3-tangle $\tau$, and the Kempe invariant $\kappa$. Using a canonical form for symmetric $N$-qubit states derived from their Majorana representation, we derive the explicit achievable region of triples $(\mathcal C,\tau,\kappa)$. 

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