In this work,a scheme for controlled quantum state transfer is proposed using parity measurement in a cavity-waveguide system.As two special cases,two schemes of controlled quantum state transfer for one qubit and two...In this work,a scheme for controlled quantum state transfer is proposed using parity measurement in a cavity-waveguide system.As two special cases,two schemes of controlled quantum state transfer for one qubit and two qubits are investigated in detail.An important advantage is that controlled quantum state transfer can be completed by single-qubit rotations and the measurement of parity.Therefore,the present scheme might be realized in the scope of current experimental technology.展开更多
We propose a Lyapunov-based control approach for state transfer based on the decoherence-free target state. The expected target state is constructed to be a decoherence-free state in a decoherence-free subspace （DFS...We propose a Lyapunov-based control approach for state transfer based on the decoherence-free target state. The expected target state is constructed to be a decoherence-free state in a decoherence-free subspace （DFS） by an external laser field I, so that the system state can be decoupled from the environment, and no more decoherence process will occur. With the decoherence-free target state, we design a Lyapunov-based control field II to steer the given initial state to the decoherence-free state of open quantum systems as completely as possible, and decouple the system state from the environment at the same time. In the end, it is verified that the state transfer control designed comes true on a A-type four-level atomic system, and the system can stay on the decoherence-free target state without coupling to environment.展开更多
针对传统的WebGIS系统研究开发中存在的人机交互性差、运行速度慢等缺陷,提出了基于Adobe Flex框架和表述性状态传递(Representational State Transfer,REST)的WebGIS系统的解决方案,并应用于防汛信息管理系统的开发中。系统采用Flex实...针对传统的WebGIS系统研究开发中存在的人机交互性差、运行速度慢等缺陷,提出了基于Adobe Flex框架和表述性状态传递(Representational State Transfer,REST)的WebGIS系统的解决方案,并应用于防汛信息管理系统的开发中。系统采用Flex实现表示层的呈现,降低了系统的开发难度,增强了系统的用户体验性;使用REST技术框架解决了矢量地图的发布繁琐、服务器端和浏览器端之间响应速度慢的问题,为WebGIS的应用开发提供了新的思路。展开更多
文摘In this work,a scheme for controlled quantum state transfer is proposed using parity measurement in a cavity-waveguide system.As two special cases,two schemes of controlled quantum state transfer for one qubit and two qubits are investigated in detail.An important advantage is that controlled quantum state transfer can be completed by single-qubit rotations and the measurement of parity.Therefore,the present scheme might be realized in the scope of current experimental technology.
基金partly supported by the National Key Basic Research Program(No.2011CBA00200)the Natural Science Foundation of China(No. 61074050)the Doctoral Fund of Ministry of Education of China(No.20103402110044)
文摘We propose a Lyapunov-based control approach for state transfer based on the decoherence-free target state. The expected target state is constructed to be a decoherence-free state in a decoherence-free subspace （DFS） by an external laser field I, so that the system state can be decoupled from the environment, and no more decoherence process will occur. With the decoherence-free target state, we design a Lyapunov-based control field II to steer the given initial state to the decoherence-free state of open quantum systems as completely as possible, and decouple the system state from the environment at the same time. In the end, it is verified that the state transfer control designed comes true on a A-type four-level atomic system, and the system can stay on the decoherence-free target state without coupling to environment.
文摘针对传统的WebGIS系统研究开发中存在的人机交互性差、运行速度慢等缺陷,提出了基于Adobe Flex框架和表述性状态传递(Representational State Transfer,REST)的WebGIS系统的解决方案,并应用于防汛信息管理系统的开发中。系统采用Flex实现表示层的呈现,降低了系统的开发难度,增强了系统的用户体验性;使用REST技术框架解决了矢量地图的发布繁琐、服务器端和浏览器端之间响应速度慢的问题,为WebGIS的应用开发提供了新的思路。
