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Opt Express. 2010 Apr 26;18(9):9207-12. doi: 10.1364/OE.18.009207.

A Michelson controlled-not gate with a single-lens astigmatic mode converter.

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Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói - RJ, Brazil.


We propose and demonstrate experimentally a single lens design for an astigmatic mode converter that transforms the transverse mode of paraxial optical beams. As an application, we implement a controlled-not gate based on a Michelson interferometer in which the photon polarization is the control bit and the first order transverse mode is the target. As a further application, we also build a transverse mode parity sorter which can be useful for quantum information processing as a measurement device for the transverse mode qubit.

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