期刊
NEW JOURNAL OF PHYSICS
卷 17, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/17/8/083027
关键词
quantum Fisher information; quantum metrology; quantum entanglement; Dicke states
资金
- EU (ERC) [258647/GEDENTQOPT]
- MINECO [FIS2012-36673-C03-03]
- Basque Government [IT4720-10]
- UPV/EHU Program [UFI 11/55]
- OTKA [K83858]
- Centre QUEST
- DFG
- EMRP
- European Union
- EU (CHIST-ERA QUASAR)
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 apply our method to recent experimental results.
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