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The orbital angular momentum (OAM) provides a unique way of adding a degree of freedom to the information content of a photon. We show a method to sort the OAM content of a collimated laser beam at very low light levels by using spatial interference between the OAM beam and a strong local oscillator field. The resulting interferogram is analyzed in the Fourier domain. By further numerically filtering, the OAM content of the beam can be distinguished with a one-count standard deviation consistent with the quantum noise floor.
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