Strong operator law of large numbers for discrete generalized quantum channels

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Let 1p21\leqslant p\leqslant 2. Let A ⁣:ΩL(Tp)A\colon\Omega\to\mathcal{L}(\mathcal{T}_p) be a generator of a semigroup eAte^{At} such that A\lVert A\rVert is bounded, and let A,A1,A2,A,A_1,A_2,\ldots be a sequence of random independent identically distributed generators. The strong operator topology is understood on Tp\mathcal{T}_p, with convergence uniform for tt in every compact segment.

Strong operator law of large numbers. Under these assumptions, eA1t/neAnt/ne^{A_1t/n}\ldots e^{A_nt/n} converges almost surely in the strong operator topology of Tp\mathcal{T}_p to eEAte^{\operatorname{\mathbb{E}} At} uniformly for tt in any segment.

The theorem preceding this conjecture proves the analogous statement in the strong operator topology of T2\mathcal{T}_2; the conjecture asks for the corresponding law in Tp\mathcal{T}_p.

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Primary source

S. V. Dzhenzher and V. Zh. Sakbaev, “The law of large numbers for discrete generalized quantum channels”, arXiv:2504.10033 (2025).

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