Phase estimation without a priori knowledge in the presence of loss

Details Phase estimation without a priori knowledge in the presence of loss Phase estimation without a priori knowledge in the presence of loss

2010-06-03

arxiv.org/abs/1006.0734v3

Phys. Rev. A 82, 053804 (2010)

Physics

Quantum Physics

8 pages, 2 figures, discussion on adaptive strategies added

Scientific paper

10.1103/PhysRevA.82.053804

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

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