Detecting Genuine Multipartite Entanglement with Two Local Measurements

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Abstract
We describe a method for constructing entanglement witnesses with a simple local decomposition based on the stabilizer formalism. We demonstrate the power of our approach by presenting witnesses to detect genuine multipartite entanglement for quantum states close to GHZ and cluster states for an arbitrary number of qubits. Our constructions are robust against noise and require only two local measurement settings when used in an experiment, independent from the number of qubits. Our approach is generalized for graph states and three-qubit W states. Some connections to Bell inequalities are also discussed.

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