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The optimal state determination (or tomography) is studied for a compositesystem of two qubits when measurements can be performed on one of the qubitsand interactions of the two qubits can be implemented. The goal is to minimizethe number of interactions to be used. The algebraic method applied in thepaper leads to an extension of the concept of mutually unbiased measurements.Comment: 8 pages LATE

State tomography for two qubits using reduced densities