Improving the Fidelity of Quantum Cloning by Fast Cycling away the Unwanted Transition

Details Improving the Fidelity of Quantum Cloning by Fast Cycling away the Unwanted Transition Improving the Fidelity of Quantum Cloning by Fast Cycling away the Unwanted Transition

2000-10-09

arxiv.org/abs/quant-ph/0010035v2

Phys. Rev. A, 64, 022315 (2001)

Physics

Quantum Physics

RevTeX, 12 pages, 6 figures, the text has been thoroughly revised with modified abstract, new figures and added reference ; re

Scientific paper

10.1103/PhysRevA.64.022315

The fidelity of quantum cloning is very often limited by the accompanying unwanted transitions. We show how the fidelity can be improved by using a coherent field to cycle away the unwanted transitions. We demonstrate this explicitly in the context of the model of Simon {\it et al.} [J. Mod. Opt. {\bf 47}, 233 (2000) ; Phys. Rev. Lett. {\bf 84}, 2993 (2000)]. We also investigate the effects of the number of atoms on the quality of quantum cloning. We show that the universality of the scheme can be maintained by choosing the cycling field according to the input state of the qubit.

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