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Improving quantum state transfer in a general XY chain via the Dzyaloshinsky Moriya interaction

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Chinese Physics B 2011年第10期20卷 51-60页

作者：张剑绍彬邹健李前树 Department of Chemistry School of Sciences Beijing Institute of Technology Key Laboratory of Cluster Science of Ministry of Education and Department of Physics School of Sciences Beijing Institute of Technology Institute of Chemical Physics Beijing Institute of Technology

We study the state transfer of Bell states in a general XY spin chain using the Dzyaloshinsk^Moriya interaction. Two symmetries of fidelity with the anisotropy parameter axe found. The maximum fidelity is shown to be significantly enhanced in cases of an odd number of sites. Enhancement of fidelity on a singlet state is greater than that on the other Bell states in such cases.

关键词： state transfer XY spin chain Dzyaloshinsky-Moriya interaction

state transfer of Two-level Quantum System Feedback Control Based on Online state Estimation

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State Transfer of Two-level Quantum System Feedback Control ...

Second-order magnetic field gradient-induced strong coupling between nitrogen-vacancy centers and a mechanical oscillator

第40届中国控制会议

作者： Shuang Cong Yaru Tang Kezhi Li Department of Automation University of Science and Technology of China University College London

A quantum state feedback control method is proposed in this paper. The state of a two-level open quantum system is estimated online based on the continuous weak measurement and the compressed sensing theory. Based on the state estimated online and the Lyapunov stability theorem, the state feedback control law used to transfer the quantum state is designed. Moreover, three numerical simulation experiments are implemented in the MATLAB environment: the state transfer from eigenstates to eigenstates, superposition states to superposition states, and superposition states to mixed states. The experimental results verify high performance of the proposed feedback control based on the state estimated online.

关键词： Two-level quantum system Online estimation of quantum state Quantum Lyapunov control state transfer

来源： cnki会议评论

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Science China(Physics,Mechanics & Astronomy) 2017年第7期60卷 17-24页

作者： Kang Cai RuiXia Wang ZhangQi Yin GuiLu Long state Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China Center for Quantum Information Institute for Interdisciplinary Information Sciences Tsinghua University Beijing 100084 China Tsinghua National Laboratory of Information Science and Technology Beijing 100084 China Collaborative Innovation Center of Quantum Matter Beijing 100084 China

We consider a cantilever mechanical oscillator(MO) made of diamond. A nitrogen-vacancy(NV) center lies at the end of the cantilever. Two magnetic tips near the NV center induce a strong second-order magnetic field gradient. Under coherent driving of the MO, we find that the coupling between the MO and the NV center is greatly enhanced. We studied how to generate entanglement between the MO and the NV center and realize quantum state transfer between them. We also propose a scheme to generate two-mode squeezing between different MO modes by coupling them to the same NV center. The decoherence and dissipation effects for both the MO and the NV center are numerically calculated using the present parameter values of the experimental configuration. We have achieved high fidelity for entanglement generation, quantum state transfer, and large twomode squeezing.

关键词： second-order magnetic field gradient NV center mechanical oscillator entanglement state transfer squeezing

Quantum Information Processing in An Array of Fiber Coupled Cavities

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Communications in Theoretical Physics 2010年第4期53卷 764-770页

作者：李建邹健邵彬 Department of Physics Beijing Institute of Technology

We consider a fiber coupled cavity array. Each cavity is doped with a single two-level atom. By treating the atom-cavity systems as combined polaritonie qubits, we can transform it into a polaritonic qubit-qubit array in the dispersive regime. We show that the four fiber coupled cavity open chain and ring can both generate the four qubit W state and cluster state, and can both transfer one and two qubit arbitrary states. We also discuss the dynamical behaviors of the four fiber coupled cavity array with unequal couplings.

关键词： fiber coupled cavity array state transfer multipartite entanglement

Quantum Information Processing in a Coupled Cavity Array

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Communications in Theoretical Physics 2008年第12期50卷 1312-1316页

作者： LI Jian ZOU Jian SHAO Bin Department of Physics Beijing Institute of Technology Beijing 100（}81 China

We consider a one-dimensional array of L identical coupled cavities,and each cavity is doped with atwo-level ***,it has been developed in several varieties by the newest *** find that theone-qubit quantum state can be perfectly transferred through the cavity array,and the entanglement between the firsttwo qubits can also be transferred to the last two *** addition,we successfully realized the entangling gate andswap gate in the coupled cavity array.

关键词： state transfer entanglement transfer quantum gate coupled cavity array

A Logic-Based Safety Analysis Algorithm for Discretionary Access Control

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Wuhan University Journal of Natural Sciences 2012年第6期17卷 531-538页

作者： YAN Xuexiong WANG Qingxian ZHU Junhu XI Qi National Digital Switching System Engineering and Technological R&D Center Zhengzhou 450002HenanChina

For the issue of the discretionary access control（DAC） model safety analysis,a logic method is *** method takes the GD model as the classic DAC model and Prolog as the basic language to describe system states and state transfer rules.A general program based on this logic method is proposed for DAC safety analysis,but this program may never be terminal for some safety analysis *** safety analysis algorithm is achieved by simplifying the general program according to the property of the DAC model state transfer *** safety analysis algorithm is easier to understand and implement than the previous algorithms and its time complexity is O（N＋M＋T）,in which N,M,and T are the numbers of the rights with copy flag,the policies for right transferring,and the policies for right permitting,respectively.

关键词： discretionary access control(DAC) safety analysis logic state transfer

The Cost-effectiveness and Risk Analysis of Dynamic Conflict Decision Making

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Systems Science and Systems Engineering 1998年第3期8卷 125-129页

作者： MA Chaoqun International Business School of Hunan Univ, Hunan, Changsha 410082

This paper introduces the technique of cost effectiveness and risk analysis employed in decision making appraisal to the major processes of analysis of the dynamic conflict decision making modelling, and have obtained conflict state transfer, conflict decision making selection, cost effectiveness and risk computation appraisal model of enforcement under different patterns. This work has made the dynamic conflict decision modelling analysis more comprehensive, accurate and effective.

关键词： dynamic conflict analysis state transfer cost effectiveness risk analysis.

Perfect Information transfer in Neighbor-coupled Spin Chains

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Perfect Information Transfer in Neighbor-coupled Spin Chains