This work derives the exact contraction coefficient for m-ary symmetric channels, indicating a novel equivalence with the χ² metric.
We derive an exact closed-form expression for the Jensen–Shannon divergence contraction coefficient of m-ary symmetric channels and show its equality with the χ² contraction coefficient, using a local-to-global and metric-transport analysis.
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Alex B. Shvets (2026) studied this question.
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