Entropic Reciprocity in Time-Reversed Young Interferometry

• URL: http://arxiv.org/abs/2605.01052v1
• Date: Fri, 01 May 2026 19:31:26 GMT
• Title: Entropic Reciprocity in Time-Reversed Young Interferometry
• Abstract summary: We show that time-reversed Young interferometry reorganizes, rather than reverses, optical entropy.<n>A fixed detector conditions the reciprocal source--detector Green function and produces a source-label probability distribution.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We show that time-reversed Young interferometry reorganizes, rather than reverses, optical entropy. A fixed detector conditions the reciprocal source--detector Green function and produces a source-label probability distribution. Marginal entropies in the standard and time-reversed geometries are generally unequal; the reciprocal invariant is instead the mutual information between source and detector coordinates. Near a destructive response, the conditioned source-label entropy can decrease while Fisher information for small phase, tilt, or defocus perturbations increases. The result identifies time-reversed Young interferometry as a source-space information processor with no analogue in ordinary detector-plane fringe readout.

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