KIP publications

 
year 2014
author(s) Helmut Strobel, Wolfgang Muessel, Daniel Linnemann, Tilman Zibold, David B. Hume, Luca Pezz, Augusto Smerzi, Markus K. Oberthaler
title Fisher information and entanglement of non-Gaussian spin states
KIP-Nummer HD-KIP 14-57
KIP-Gruppe(n) F17,F20,P3
document type Paper
Keywords Fisher information and entanglement of non-Gaussian spin states
source SCIENCE, 345 (2014) 424-427, arXiv:1507.03782
doi 10.1126/science.1250147
Abstract (en)

Entanglement is the key quantum resource for improving measurement sensitivity beyond classical limits. However, the production of entanglement in mesoscopic atomic systems has been limited to squeezed states, described by Gaussian statistics. Here, we report on the creation and characterization of non-Gaussian many-body entangled states. We develop a general method to extract the Fisher information, which reveals that the quantum dynamics of a classically unstable system creates quantum states that are not spin squeezed but nevertheless entangled. The extracted Fisher information quantifies metrologically useful entanglement, which we confirm by Bayesian phase estimation with sub–shot-noise sensitivity. These methods are scalable to large particle numbers and applicable directly to other quantum systems.

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