Quantum Fisher Information of Entangled Coherent States in a Lossy Mach-Zehnder Interferometer

We give an analytical result for the quantum Fisher information of entangled coherent states in a lossy Mach-Zehnder interferometer recently proposed by Joo et al., [Phys. Rev. Lett. 107 （2011） 083601]. For small loss of photons, we find that the entangled coherent state can surpass the Heisenberg l...

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Bibliographic Details
Published in:Communications in theoretical physics 2014, Vol.61 (1), p.115-120
Main Author: 井晓幸 刘京 钟伟 王晓光
Format: Article
Language:English
Subjects:
Coherence
Fisher信息
Formalism
Mach-Zehnder interferometers
Mathematical analysis
Photons
Theoretical physics
干涉仪
形式主义
海森堡
相位灵敏度
纠缠相干态
量子
马赫
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Summary:We give an analytical result for the quantum Fisher information of entangled coherent states in a lossy Mach-Zehnder interferometer recently proposed by Joo et al., [Phys. Rev. Lett. 107 （2011） 083601]. For small loss of photons, we find that the entangled coherent state can surpass the Heisenberg limit. Phrthermore, the formalism developed here is applicable to the study of phase sensitivity of multipartite entangled coherent states.
ISSN:0253-6102
1572-9494
DOI:10.1088/0253-6102/61/1/18