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It is shown how to use a lenticular fringe detector as a complex homodyne receiver working ratiometrically in a photon counting mode. While analog outputs for both quadrature components are available simultaneously it is argued that recursive digital filtering confers the benefits of photon antibunching. A successful hardware implementation of the polar innovations form of such a digital filter is also demonstrated.
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L. Mertz (1988) studied this question.
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