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We propose and experimentally demonstrate that a Mach-Zehnder interferometercomposed of polarized beam splitters and a pentaprism in the place of one ofthe mirrors works as a linear optical quantum controlled-NOT (CNOT) gate. Toperform the information processing, the polarization and orbital angularmomentum (OAM) of the photons act as the control and target qubits,respectively. The readout process is simple, requiring only a linear polarizerand a triangular diffractive aperture before detection. The viability andstability of the experiment makes the present proposal a valuable candidate forfuture implementations in optical quantum computation protocols.

Experimental realization of a quantum CNOT gate for orbital angular momentum and polarization with linear optical elements