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Experimental controlled-NOT logic gate for single photons in the coincidence basis

Experimental controlled-NOT logic gate for single photons in the coincidence basis

We report a proof-of-principle demonstration of a probabilistic controlled-NOT gate for single photons. Single-photon control and target qubits were mixed with a single ancilla photon in a device constructed using only linear optical elements. The successful operation of the controlled-NOT gate relied on post-selected three-photon interference effects which required the …