Quantum Cloning without Interference

Details Quantum Cloning without Interference Quantum Cloning without Interference

2008-07-10

arxiv.org/abs/0807.1657v1

Phys. Rev. 78, 042311 (2008)

Physics

Quantum Physics

14 pages revtex, 1 eps figure

Scientific paper

We study the role of interference in the process of quantum cloning. We show that in order to achieve better than classical cloning of a qubit no interference is needed. In particular, a large class of symmetric universal 1$\to$ 2 qubit cloners exists which achieve the optimal average fidelity 5/6 for such machines, without using any interference. We also obtain optimal average fidelities for interference--free cloning in asymmetric situations, and discuss the relation of the quantum cloners found to the Bu\v{z}ek--Hillery quantum cloner.

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