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Precision measurements with photon-subtracted or photon-added Gaussian states

Braun, Daniel; Jian, Pu; Pinel, Olivier; Treps, Nicolas


Photon-subtracted and photon-added Gaussian states are amongst the simplest non-Gaussian states that are experimentally available. It is generally believed that they are some of the best candidates to enhance sensitivity in parameter extraction. We derive here the quantum Cramér-Rao bound for such states and find that for large photon numbers photon subtraction or addition only leads to a small correction of the quantum Fisher information (QFI). On the other hand, a divergence of the QFI...[Show more]

CollectionsANU Research Publications
Date published: 2014
Type: Journal article
Source: Physical Review A - Atomic, Molecular, and Optical Physics
DOI: 10.1103/PhysRevA.90.013821


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