Chaos and quantum Fisher information in the quantum kicked top
Wang Xiao-Qian(王晓茜)a)b), Ma Jian(马健) b), Zhang Xi-He(张喜和)a), and Wang Xiao-Guang(王晓光)b)†
a Department of Physics, Changchun University of Science and Technology, Changchun 130022, China; b Zhejiang Institute of Modern Physics, Department of Physics, Zhejiang University, Hangzhou 310027, China
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.
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
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
