Distribution of Gaussian entanglement in linear-optical systems

Entanglement is an essential ingredient for building a quantum network that can have many applications. Understanding how entanglement distributed in crucial step to move forward. Here we study the conservation and distribution of Gaussian linear using new quantifier bipartite entanglement. We show be through beam splitter same way as transmittance reflectance. The requirements on entangled states type networks satisfy this relation are presented explicitly. Our results provide useful quantification further insights into structure network.