Detecting metrologically useful entanglement in the vicinity of Dicke states

We present a method to verify the metrological usefulness of noisy Dicke states of a particle ensemble with only a few collective measurements, without the need for a direct measurement of the sensitivity. Our method determines the usefulness of the state for the usual protocol for estimating the an...

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Bibliographic Details
Published inarXiv.org
Main Authors Apellaniz, Iagoba, Lücke, Bernd, Peise, Jan, Klempt, Carsten, Toth, Geza
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 10.10.2015
Subjects
Entangled states
Metrology
Physics - Atomic Physics
Physics - Quantum Gases
Physics - Quantum Physics
Quantum entanglement
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Summary:We present a method to verify the metrological usefulness of noisy Dicke states of a particle ensemble with only a few collective measurements, without the need for a direct measurement of the sensitivity. Our method determines the usefulness of the state for the usual protocol for estimating the angle of rotation with Dicke states, which is based on the measurement of the second moment of a total spin component. It can also be used to detect entangled states that are useful for quantum metrology. We test our approach on recent experimental results.
ISSN:2331-8422
DOI:10.48550/arxiv.1412.3426