Chaos and quantum Fisher information in the quantum kicked top

doi:10.1088/1674-1056/20/5/050510

Abstract Quantum Fisher information is related to the problem of parameter estimation. Recently, a criterion has been proposed for entanglement in multipartite systems based on quantum Fisher information. This paper studies the behaviours of quantum Fisher information in the quantum kicked top model, whose classical correspondence can be chaotic. It finds that, first, detected by quantum Fisher information, the quantum kicked top is entangled whether the system is in chaotic or in regular case. Secondly, the quantum Fisher information is larger in chaotic case than that in regular case, which means, the system is more sensitive in the chaotic case.

Keywords: quantum information quantum kicked top quantum Fisher information quantum chaos

Received: 28 September 2010
Revised: 09 December 2010
Accepted manuscript online:

PACS:	05.45.Mt	(Quantum chaos; semiclassical methods)
	03.65.Ud	(Entanglement and quantum nonlocality)
	06.20.Dk	(Measurement and error theory)

Fund: Project supported by National Natural Science Foundation of China (Grant Nos. 11025527, 10874151, and 10935010).

Cite this article:

Wang Xiao-Qian(王晓茜), Ma Jian(马健), Zhang Xi-He(张喜和), and Wang Xiao-Guang(王晓光) Chaos and quantum Fisher information in the quantum kicked top 2011 Chin. Phys. B 20 050510

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