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We revisit the problem of detection of entanglement of an unknown two-qubitstate using minimal resources. Using weak values and just two copies of anarbitrary two-qubit state, we present a protocol where a post selectionmeasurement in the computational basis provides enough information to identifyif the state is entangled or not. Our protocol enables complete stateidentification with a single-setting post selection measurement on two copiesof the state. It follows that by restricting to pure states, the globalinteraction required for determining the weak values can be realized by localoperations. We further show that our protocol is robust against errors arisingfrom inappropriate global interactions applied during weak value determination.

Universal detection of entanglement in two-qubit states using only two copies