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Quan, H. T.; Wang, Z. D.; Sun, C. P.; Quan, HT , Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
Quantum critical dynamics of a qubit coupled to an isotropic Lipkin-Meshkov-Glick bath
Source PublicationPHYSICAL REVIEW A
KeywordBody Approximation Methods Jaynes-cummings Model Solvable Model Antiferromagnetic Environment Phase-transition Dicke-model Entanglement Decoherence Validity System
AbstractWe explore a dynamic signature of quantum phase transition (QPT) in an isotropic Lipkin-Meshkov-Glick (LMG) model by studying the time evolution of a central qubit coupled to it. We evaluate exactly the time-dependent purity, which can be used to measure quantum coherence, of the central qubit. It is found that distinctly different behaviors of the purity as a function of the parameter reveal clearly the QPT point in the system. It is also clarified that the present model is equivalent to an anti-Jaynes-Cummings model under certain conditions.
2007
ISSN1050-2947
Volume76Issue:1Pages:-
Subject AreaPhysics
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5698
Collection理论物理所科研产出_SCI论文
Corresponding AuthorQuan, HT , Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Quan, H. T.,Wang, Z. D.,Sun, C. P.,et al. Quantum critical dynamics of a qubit coupled to an isotropic Lipkin-Meshkov-Glick bath[J]. PHYSICAL REVIEW A,2007,76(1):-.
APA Quan, H. T.,Wang, Z. D.,Sun, C. P.,&Quan, HT , Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China.(2007).Quantum critical dynamics of a qubit coupled to an isotropic Lipkin-Meshkov-Glick bath.PHYSICAL REVIEW A,76(1),-.
MLA Quan, H. T.,et al."Quantum critical dynamics of a qubit coupled to an isotropic Lipkin-Meshkov-Glick bath".PHYSICAL REVIEW A 76.1(2007):-.
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