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quant-ph2025
Choi-level twirling of quantum channels: finite constructions and non-compact transformations
Marcin Markiewicz, Łukasz Pawela, Zbigniew Puchała
Twirling, i.e. averaging over symmetry actions, is a standard tool for reducing quantum states and channels to a symmetry-invariant form. We study channel twirling from the perspec…
quant-ph2025
Single-shot comparison of random quantum channels and measurements
Marcin Markiewicz, Łukasz Pawela, Zbigniew Puchała
In this work we provide an efficiency analysis of the problem of comparison of two randomly chosen quantum operations in the single-shot regime. We provide tight bounds for the suc…