Fisher information and multiparticle entanglement
@article{Hyllus2012FisherIA, title={Fisher information and multiparticle entanglement}, author={Philipp Hyllus and Wiesław Laskowski and Roland Krischek and Christian Schwemmer and Witlef Wieczorek and Harald Weinfurter and Luca Pezz'e and Augusto Smerzi}, journal={Physical Review A}, year={2012}, volume={85}, pages={022321} }
The Fisher information F gives a limit to the ultimate precision achievable in a phase estimation protocol. It has been shown recently that the Fisher information for a linear two-mode interferometer cannot exceed the number of particles if the input state is separable. As a direct consequence, with such input states the shot-noise limit is the ultimate limit of precision. In this work, we go a step further by deducing bounds on F for several multiparticle entanglement classes. These bounds…
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