Quantum speed-up capacity in different types of quantum channels for two-qubit open systems

Quantum speed-up capacity in different types of quantum channels for two-qubit open systems

Wei Wu;Xin Liu;Chao Wang

【期刊名称】《中国物理：英文版》 【年(卷),期】2018(027)006

【摘要】A potential acceleration of a quantum open system is of fundamental

interest

in

quantum

computation,quantum

communication,and quantum metrology.In this paper,we investigate the \speed-up capacity\which reveals the potential ability of a quantum system to be accelerated.We explore the evolutions of the speed-up capacity in different quantum channels for two-qubit states.We find that although the dynamics of the capacity is varying in different kinds of channels,it is positive in most situations which are considered in the context except one case in the amplitude-damping channel.We give the reasons for the different features of the dynamics.Anyway,the speed-up capacity can be improved by the memory effect.We find two ways which may be used to control the capacity in an experiment:selecting an appropriate coefficient of an initial state or changing the memory degree of environments. 【总页数】6页(143-148) 【关键词】

【作者】Wei Wu;Xin Liu;Chao Wang

【作者单位】Department of Physics, School of Science, Wuhan University of Technology(WUT), Wuhan 430070, China;Department of Physics, School of Science, Wuhan University of Technology(WUT), Wuhan 430070, China;School of Engineering and Digital Arts, University of Kent, Canterbury, United Kingdom 【正文语种】英文 【中图分类】 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_chinese-physics-b_thesis/0201251210037.html 【相关文献】

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