1204.2722 (Marcin Wieśniak et al.)

Package of facts and theorems for efficiently generating entanglement
criteria for many qubits    [PDF]

Marcin Wieśniak, Koji Maruyama

We present a package of mathematical theorems, which allow to construct multipartite entanglement criteria. Importantly, establishing bounds for certain classes of entanglement does not take an optimization over continuous sets of states. These bonds are found from the properties of commutativity graphs of operators used in the criterion. We present two examples of criteria constructed according to our method. One of them detects genuine 5-qubit entanglement without ever referring to correlations between all five qubits.

View original: http://arxiv.org/abs/1204.2722