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arXiv:2608.19685

Tight Entropy Contraction of Generalized Quantum Depolarization

Li Gao, Long Zhao

quant-phmath.FAmath.OASubmitted Aug 20, 2026• Announced Aug 21, 2026• 0 citations
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Abstract

We establish upper and lower bounds for relative entropy contraction of generalized quantum depolarizing channels and semigroups. Our bound provides tight first order asymptotic of the contraction rate in terms of the dimension constant. One side estimate are based on sharp reverse ratio and convexity of relative entropy of two states, which can be derived from the recently introduced Hockey-Stick quantum $f$-divergence, and also independently, Bogoliubov--Kubo--Mori quantum Fisher information metric. The other side follows from the existence of index achieving pure state with respect to a general conditional expectation. Our results extend to the complete entropy contraction rate, tensor stable estimates for product dynamics. Examples include quantum depolarization, dephasing, and compact group symmetrization, with consequences for the decay rate of coherence and asymmetry.

Comments
24 pages, comments welcome

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