Multipartite Entanglement Witnesses

J. Sperling, W. Vogel
2013 Physical Review Letters  
We derive a set of algebraic equations, the so-called multipartite separability eigenvalue equations. Based on their solutions, we introduce a universal method for the construction of multipartite entanglement witnesses. We witness multipartite entanglement of 10^3 coupled quantum oscillators, by solving our basic equations analytically. This clearly demonstrates the feasibility of our method for studying ultra-high orders of multipartite entanglement in complex quantum systems.
doi:10.1103/physrevlett.111.110503 pmid:24074063 fatcat:qiwi7blbavfcjlthbpakxnuhgi