Using states with a large photon number variance to increase quantum Fisher information in single-mode phase estimation
arXiv:1907.06349 · doi:10.1088/2399-6528/ab524a
Abstract
When estimating the phase of a single mode, the quantum Fisher information for a pure probe state is proportional to the photon number variance of the probe state. In this work, we point out particular states that offer photon number distributions exhibiting a large variance, which would help to improve the local estimation precision. These theoretical examples are expected to stimulate the community to put more attention to those states that we found, and to work towards their experimental realization and usage in quantum metrology.
arXiv comment7 pages, 1 figure
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