Sequential quantum cloning

Y. Delgado, L. Lamata, J. León, D. Salgado, E. Solano

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Not all unitary operations upon a set of qubits can be implemented by sequential interactions between each qubit and an ancillary system. We analyze the specific case of sequential quantum cloning, 1→M, and prove that the minimal dimension D of the ancilla grows linearly with the number of clones M. In particular, we obtain D=2M for symmetric universal quantum cloning and D=M+1 for symmetric phase-covariant cloning. Furthermore, we provide a recipe for the required ancilla-qubit interactions in each step of the sequential procedure for both cases. © 2007 The American Physical Society.
Original languageSpanish
JournalPhysical Review Letters
StatePublished - 13 Apr 2007
Externally publishedYes

Cite this