Experimental measurement of collective nonlinear entanglement witness for two qubits
Experimental measurement of collective nonlinear entanglement witness for two qubits
We present a proof-of-principle experiment demonstrating measurement of the collectibility, a nonlinear entanglement witness proposed by \L{}. Rudnicki et al. [Phys. Rev. Lett. 107, 150502 (2011)]. This entanglement witness works for both mixed and pure two-qubit states. In the latter case it can be used to measure entanglement in terms …