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We show that for any Hilbert-space dimension, the optimal universal quantumcloner can be constructed from essentially the same quantum circuit, i.e., wefind a universal design for universal cloners. In the case of infinitedimensions (which includes continuous variable quantum systems) the universalcloner reduces to an essentially classical device. More generally, we constructa universal quantum circuit for distributing qudits in any dimension which actscovariantly under generalized displacements and momentum kicks. The behavior ofthis covariant distributor is controlled by its initial state. We show thatsuitable choices for this initial state yield both universal cloners andoptimized cloners for limited alphabets of states whose states are related bygeneralized phase-space displacements.Comment: 10 revtex pages, no figure

Quantum-information distributors: Quantum network for symmetric and asymmetric cloning in arbitrary dimension and continuous limit