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Using multiport beam-splitter (BS) configurations eight input operatorsa(0),a(1),a(2) a(3),a(4) a(5),a(6), a(7) are mixed by 12 BS's to produce theoutput operators b(0), b(1), b(2), b(3), b(4), b(5), b(6), b(7). A singlephoton entering into, or exiting from, one port of a BS is considered as the|0> state while that in the second port of the BS is considered as the |1>state. Two single photons are inserted into two of the BS's simulating twoinput qubit-states by operators a(0), a(1),a(2), a(3) . In order to simulatethe two-qubit gates we exclude by postselection all the cases in which one ortwo photons exit through output ports b(4), b(5), b(6), b(7) so that only 25%of the experiments are taken into account. The method simulates explicitly theCNOT and SWAP gates but similar methods can be used for other gates.

Simulation of quantum gates by postselection of interference experiments in multi-port beam-splitter (BS) configurations