30 August 2010 Analogue factoring algorithm based on polychromatic interference
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We present a novel factorization algorithm which can be computed using an analogue computer based on a polychromatic source with a given wavelength bandwidth, a multi-path interferometer and a spectrometer. The core of this algorithm stands on the measurement of the periodicity of a "factoring" function given by an exponential sum at continuous argument by recording a sequence of interferograms associated with suitable units of displacement in the inteferometer. A remarking rescaling property of such interferograms allows, in principle, the prime number decomposition of several large integers. The information about factors is encoded in the location of the inteferogram maxima.
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Vincenzo Tamma, Augusto Garuccio, Yanhua Shih, "Analogue factoring algorithm based on polychromatic interference", Proc. SPIE 7815, Quantum Communications and Quantum Imaging VIII, 78150R (30 August 2010); doi: 10.1117/12.877427; https://doi.org/10.1117/12.877427


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