The scheme of Clauser and Dowling [Phys. Rev. A 53, 4587 (1996)] for factoring N by means of an N-slit interference experiment is translated into an experiment with a single Mach-Zehnder interferometer. With dispersive phase shifters, the ratio of the coherence length to wavelength limits the numbers that can be factored. A conservative estimate permits N≈10⁷. It is furthermore shown that sine and cosine Fourier coefficients of a real periodic function can be obtained with such an interferometer.
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Johann Summhammer (1997) studied this question.
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