 perfect entanglement swapping set $\hat{{\rm {\mathcal S}}}\left(R_{j} \right)$, $\gamma =0$, the $B'_{R_{j} } \left(\pi _{S} \right)$ outgoing entanglement rate is $\left|B'_{R_{j} } \left(\pi _{S} \right)\right|={\tfrac{0}{0+