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- W4297437610 abstract "Quantum cloning is a fundamental protocol of quantum information theory. Perfect universal quantum cloning is prohibited by the laws of quantum mechanics, only imperfect copies being reachable. Symmetric quantum cloning is concerned with case when the quality of the clones is identical. In this work, we study the general case of $1 to N$ asymmetric cloning, where one asks for arbitrary qualities of the clones. We characterize, for all Hilbert space dimensions and number of clones, the set of all possible clone qualities. This set is realized as the nonnegative part of the unit ball of a newly introduced norm, which we call the $mathcal{Q}$-norm. We also provide a closed form expression for the quantum cloner achieving a given clone quality vector. Our analysis relies on the Schur-Weyl duality and on the study of the spectral properties of partially transposed permutation operators." @default.
- W4297437610 created "2022-09-28" @default.
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- W4297437610 date "2022-09-24" @default.
- W4297437610 modified "2023-09-29" @default.
- W4297437610 title "The Asymmetric Quantum Cloning Region" @default.
- W4297437610 doi "https://doi.org/10.48550/arxiv.2209.11999" @default.
- W4297437610 hasPublicationYear "2022" @default.
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