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Precise phase measurements using an entangled coherent state
Quantum entanglement offers the possibility of making measurements beyond the classical limit, however some issues still need to be overcome before it can be applied in realistic lossy systems. Recent work has used quantum Fisher information (QFI) to show that entangled coherent states (ECSs) may be useful for this purpose as they combine sub-classical phase precision capabilities with robustness (Joo et al., 2011). However, to date no effective scheme for measuring a phase in lossy systems using an ECS has been devised. Here we present a scheme that does just this. We show how one could measure a phase to a precision significantly better than that attainable by both unentangled ‘classical’ states and highly-entangled NOON states over a wide range of different losses. This brings quantum metrology closer to being a realistic and practical technology.
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Publication status
- Published
External DOI
Page range
205-211Presentation Type
- paper
Event name
2nd International Conference on Photonics, Optics and Laser TechnologyEvent location
LisbonEvent type
conferenceEvent date
7 - 9 January 2014Book title
Proceedings of 2nd International Conference on Photonics, Optics and Laser TechnologyDepartment affiliated with
- Physics and Astronomy Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2015-06-04Usage metrics
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