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We study the procedure for sequential unambiguous state discrimination. Aqubit is prepared in one of two possible states, and measured by two observersBob and Charlie sequentially. A necessary condition for the state to beunambiguously discriminated by Charlie is the absence of entanglement betweenthe principal qubit, prepared by Alice, and Bob's auxiliary system. In general,the procedure for both Bob and Charlie to recognize between two nonorthogonalstates conclusively relies on the availability of quantum discord which isprecisely the quantum dissonance when the entanglement is absent. In Bob'smeasurement, the left discord is positively correlated with the informationextracted by Bob, and the right discord enhances the information left toCharlie. When their product achieves its maximum the probability for both Boband Charlie to identify the state achieves its optimal value.

Sequential State Discrimination and Requirement of Quantum Dissonance