Realization of Bipartite Positive-Operator-Value Measurements of Two-Photon Polarization States

In this letter, we propose a scheme of a special quantum optical Fredkin gateassisted by optical manipulations and postselection from the coincidencemeasurements, and then modify it with cross-Kerr nonlinearities to be suitablefor the realization of all possible positive operator-valued measurements ofbipartite polarization states. This scheme is feasible in the lab with thecurrent experimental technology.