Phase estimation without a priori knowledge in the presence of loss
arXiv:1006.0734 · doi:10.1103/PhysRevA.82.053804
Abstract
We find the optimal scheme for quantum phase estimation in the presence of loss when no a priori knowledge on the estimated phase is available. We prove analytically an explicit lower bound on estimation uncertainty, which shows that, as a function of number of probes, quantum precision enhancement amounts at most to a constant factor improvement over classical strategies
arXiv comment8 pages, 2 figures, discussion on adaptive strategies added
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