期刊
PHYSICAL REVIEW A
卷 85, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.85.022322
关键词
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资金
- European Union (ERC)
- Spanish MICINN [FIS2009-12773-C02-02]
- Basque Government [IT4720-10]
- Hungary OTKA [K83858]
We present several entanglement criteria in terms of the quantum Fisher information that help to relate various forms of multipartite entanglement to the sensitivity of phase estimation. We show that genuine multipartite entanglement is necessary to reach the maximum sensitivity in some very general metrological tasks using a two-arm linear interferometer. We also show that it is needed to reach the maximum average sensitivity in a certain combination of such metrological tasks.
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