Stochastic local operations and classical communication invariant and the residual entanglement for n qubits
Dafa Li, Xiangrong Li, Hongtao Huang, Xinxin Li · Physical Review A · 2007
We find an invariant for $n$ qubits and propose residual entanglement for $n$ qubits by means of the invariant. Thus, we establish a relation between stochastic local operations and classical communication (SLOCC) entanglement and residual entanglement. Invariant and residual entanglement can be used for SLOCC entanglement classification of $n$ qubits.