Measurement-assisted Coherent Control

Details Measurement-assisted Coherent Control Measurement-assisted Coherent Control

2004-03-10

arxiv.org/abs/quant-ph/0403086v1

J. Chem. Phys. 120, 9984 (2004)

Physics

Quantum Physics

5 pages, 3 figures, to appear in J. Chem. Phys

Scientific paper

10.1063/1.1735644

Two advantageous roles of the influence of measurement on a system subject to coherent control are exposed using a five-level model system. In particular, a continuous measurement of the population in a branch state in the Kobrak-Rice extended stimulated Raman adiabatic passage scheme is shown to provide a powerful means for controlling the population transfer branching ratio between two degenerate target states. It is demonstrated that a measurement with a large strength may be used to completely shut off the yield of one target state and that the same measurement with a weak strength can dramatically enhance the robustness of the controlled branching ratio against dephasing.

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