  We present entanglement witness operators for detecting genuine multipartite
entanglement. These witnesses are robust against noise and require only two
local measurement settings when used in an experiment, independent from the
number of qubits. This allows detection of entanglement for an increasing
number of parties without a corresponding increase in effort. The witnesses
presented detect states close to GHZ, cluster and graph states. Connections to
Bell inequalities are also discussed.
