Abstract
In this work, we show the ability to restore states of quantum systems from evolution induced by quantum dynamical semigroups perturbed by covariant measures. Our procedure describes reconstruction of quantum states transmitted via quantum channels, and as a particular example, it can be applied to the reconstruction of photonic states transmitted via optical fibers. For this, the concept of perturbation by covariant operator-valued measure in a Banach space is introduced and integral representation of the perturbed semigroup is explicitly constructed. Various physically meaningful examples are provided. In particular, a model of the perturbed dynamics in the symmetric (boson) Fock space is developed as covariant measure for a semiflow of shifts and its perturbation in the symmetric Fock space, and its properties are investigated. Another example may correspond to the Koopman–von Neumann description of a classical oscillator with bounded phase space.
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Acknowledgements
This work was funded by Russian Federation represented by the Ministry of Science and Higher Education of the Russian Federation (Grant Number 075-15-2020-788) and performed at the Steklov Mathematical Institute of the Russian Academy of Sciences.
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Amosov, G.G., Baitenov, E.L. & Pechen, A.N. On reconstruction of states from evolution induced by quantum dynamical semigroups perturbed by covariant measures. Quantum Inf Process 22, 401 (2023). https://doi.org/10.1007/s11128-023-04162-3
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DOI: https://doi.org/10.1007/s11128-023-04162-3