The marginal is pretty good

arXiv:2609.05225 · quant-ph, cs.IT, math.IT · Submitted 2026-09-04 · Read on arXiv

quant-ph, cs.IT, math.IT

Submitted: 2026-09-04

Updated: 2026-09-25

Comments: 12 pages, Gui-Long Jiang and Shi-Bing Li added as authors, Theorem 3.1 now holds for $α\in(0,1)$ (instead of $[1/2,1)$), Theorem 4.1 and 4.2 show the same statement for the sandwiched Rényi divergence. This generalizes the previous result that only worked for $α=1/2$ and special classes of states

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Fidelity — 7× in this paper · explained in 2 episodes
• Trace — 2× in this paper · explained in 2 episodes
• Generalization — 1× in this paper · explained in 13 episodes

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