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We present an optical implementation of two programmable quantum measurementdevices. The first one serves for unambiguous discrimination of twononorthogonal states of a qubit. The particular pair of states to bediscriminated is specified by the quantum state of a program qubit. The seconddevice can perform von Neumann measurements on a single qubit in any basislocated on the equator of the Bloch sphere. Again, the basis is selected by thestate of a program qubit. In both cases the data and program qubits arerepresented by polarization states of photons. The experimental apparatusexploits the fact that two Bell states can be distinguished solely by means oflinear optics. The outcome corresponding to the remaining two Bell statesrepresents an inconclusive result.Comment: 7 pages, 7 figure

Experimental realization of a programmable quantum-state discriminator and a phase-covariant quantum multimeter