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Communications in Theoretical Physics 2007年第4期47卷 722-724页

作者： zhan zhi-ming School of Physics ＆ Information Engineering Jianghan University Wuhan 430056 China

In this paper, a scheme is proposed to create the entanglement of two superconducting quantum-interference devices （SQUIDs） and implement a two-quhit quantum phase gate between two SQUIDs in cavity. The scheme only requires resonant interactions. Thus the scheme is very simple and the quantum dynamics operation can he realized at a high speed, which is important in view of decoherence.

关键词： entanglement superconducting cavity

Implementation of Deutsch-Jozsa Algorithm with Superconducting Quantum-Interference Devices via Raman Transition

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Communications in Theoretical Physics 2009年第1期51卷 135-138页

作者： zhan zhi-ming School of Physics ＆ Information Engineering Jianghan University Wuhan 430056 China

In this paper, a theoretical scheme is proposed to implement the Deutsch-Jozsa algorithm with SQUIDs （superconducting quantum-interference devices） in cavity via Raman transition. The scheme only requires a quantized cavity field and classical microwave pulses. In this scheme, no transfer of quantum information between the SQUIDs and the cavity is required, the cavity field is only virtually excited and thus the cavity decay is suppressed.

关键词： Deutsch-Jozsa algorithm superconducting Raman transition

One-Step Realization of SWAP Gate with Superconducting Quantum-Interference Devices and Atoms in Cavity QED

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Communications in Theoretical Physics 2008年第6期49卷 1603-1606页

作者： zhan zhi-ming School of Physics and Information Engineering Jianghan University Wuhan 430056 China

We put forward a simple scheme for one-step realization of a two-qubit SWAP gate with SQUIDs （superconducting quantum-interference devices） in cavity QED via Raman transition. In this scheme, the cavity field is only virtually excited and thus the cavity decay is suppressed. The SWAP gate is realized by using only two lower fiux states of the SQUID system and the excited state would not be excited. Therefore, the effect of decoherence caused from the levels of the SQUID system is possibly minimized. The scheme can also be used to implement the SWAP gate with atoms.

关键词： SWAP gate superconducting Raman transition

Generation of an Entangled State of Two Three-Level Superconducting Quantum Interference Devices in Cavity

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Communications in Theoretical Physics 2006年第3期45卷 547-549页

作者： zhan zhi-ming LI Jia-Hua LI Wei-Bin School of Physics ＆ Information Engineering Jianghan University Wuhan 430056 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Center for Cold Atom Physics the Chinese Academy of Sciences Wuhan 430071 China

We propose a scheme for generating a maximally entangled state of two three-level superconducting quantum interference devices （SQUIDs） by using a quantized cavity field and classical microwave pluses in cavity. In this scheme, no quantum information will be transferred from the SQUIDs to the cavity since the cavity field is only virtually excited. Thus, the cavity decay is suppressed during the entanglement generation.

关键词： entangle superconducting cavity

Generation of Entangled States of Multiple Superconducting Quantum Interference Devices in Cavity

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Communications in Theoretical Physics 2006年第4期45卷 709-711页

We propose a scheme for generating the maximally entangled states of many superconducting quantum interference devices （SQUIDs） by using a quantized cavity field and classical microwave pulses in cavity. In the scheme, the maximally entangled states can be generated without requiring the measurement and individual addressing of the SQUIDs.

关键词： entanglement superconducting cavity

Effects of Vacuum-Induced Coherence on One- and Two-Photon Absorption Spectra of Transient Process in a Y-Type System

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Communications in Theoretical Physics 2006年第1期45卷 157-162页

作者： ZHENG An-Shou LI Jia-Hua zhan zhi-ming LIU Ji-Bing Department of Physics Huazhong University of Science and Technology Wuhan 430074 China School of Physics and Information Engineering Jianghan University Wuhan 430056 China

We investigate the influence of the vacuum-induced coherence on one- and two-photon absorption of the transient process in a four-level Y-type atomic system. We find that the one- and two-photon t, ransient absorption and amplification properties are quite sensitive to the vacuum-induced coherence. It is also shown that the one- and two-photon absorption spectra of the transient process can be dramatically affected by modulating the relative phase of the applied fields. By apprdpriately choosing the relative phase, the amplification of the probe field can be achieved.

关键词： one-photon absorption two-photon absorption vacuum-induced coherence probe amplification

Remote Preparation of an Entangled State in Nonideal Conditions

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Communications in Theoretical Physics 2006年第2X期46卷 221-224页

作者： CHEN Ai-Xi DENG Li LI Jia-Hua zhan zhi-ming Department of Physics East China Jiaotong University Nanchang 330013 China Center of Cold Atom Physics the Chinese Academy of Sciences Wuhan 430071 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China 4Department of Physics Jianghan University Wuhan 430056 China

In this paper, the theoretical investigation of remote preparation of an entangledstate is studied in nonideal conditions. Our studies include two parts. In the first part, we consider the remote state preparation （RSP） of an entangled state through two equally noisy quantum channel states, namely, a mixture of Bell states. Studies show there is a particular mixed-state channel for which all pure entangled states remain entangled after this inexact RSP. In the second part, we suppose that noises which quantum channels suffer from can be expressed as the Lindblad operators. The master equation of the system can be expressed in the Lindblad form. Through solving the master equation, we calculate the fidelity as a function of decoherence rates and parameters of the state to be prepared. For a given entangled state, we investigate the influence of different types of noises on the fidelity.

关键词： remote state preparation fidelity entanglement

Preparation of Cluster States for Many Atoms in Cavity QED

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Communications in Theoretical Physics 2007年第7期48卷 83-86页

作者： zhan zhi-ming School of Physics & Information Engineering,Jianghan University,Wuhan 430056,China School of Physics & Information Engineering Jianghan University Wuhan 430056 China

We propose a scheme for the generation of the cluster states for many atoms in cavity *** our scheme,the atoms are sent through nonresonant cavity fields in the vacuum *** cavity fields are only virtually excitedand no quantum information will be transferred from the atoms to the cavity *** advantage is that the cavitiesare suppressed during the *** scheme can also be generalized to the ion trap system.

关键词： cluster cavity QED atom

Entangled Fields in Multiple Cavities by Interaction with One Three-Level Atom

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Communications in Theoretical Physics 2006年第1期45卷 151-153页

作者： zhan zhi-ming LI Jia-Hua YANG Wen-Xing LI Wei-Bin School of Physics ＆ Information Engineering Jianghan University Wuhan 430056 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Center for Cold Atom Physics the Chinese Academy of Sciences Wuhan 430071 China

We present a scheme to entangle fields in multiple cavities. Our scheme is based on the resonant interaction of a ≡-type three-level atom with the cavity fields for precalculated interaction time, which enables us to generate a quantum entangled Greenberger-Horn-Zeilinger （GHZ） state of fields in multiple cavities. In principle, the scheme can be also generalized to generate N-party GHZ state. The required experimental techniques are within the scope of what can be obtained in the microwave cavity QED set up.

关键词： cavity GHZ state ≡-type atom

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基于多维光谱空间的干旱指数

红外与毫米波学报 2012年第5期31卷 441-448页

作者：刘芳詹志明冯海霞赵少华北京大学地球与空间科学学院北京100871 环境保护部卫星环境应用中心北京100094

遥感干旱指数是用遥感数据定量描述区域受旱程度以及作物产量灾损的机理性数学模型.干旱指数在农业、林业和生态环境监测方面有较高的研究价值与非常广阔的应用前景,是当前的研究前沿和热点之一.介于遥感干旱指数起步至今还未形成研究系... 详细信息

遥感干旱指数是用遥感数据定量描述区域受旱程度以及作物产量灾损的机理性数学模型.干旱指数在农业、林业和生态环境监测方面有较高的研究价值与非常广阔的应用前景,是当前的研究前沿和热点之一.介于遥感干旱指数起步至今还未形成研究系统,开展了这方面工作的梳理和归纳.首先,对多维光谱特征空间概念作延伸,将多维光谱特征空间的多维变量由光谱值拓展为与一切干旱相关的遥感产品,将光谱特征统一归纳到多维坐标框架当中,使得干旱指数的数学建模意义更明确,构造更清晰;其次,对30种干旱指数进行归纳,从"三要素"的角度将干旱指数分为四类,并评价其各自优势和局限性,将干旱遥感监测模型家族抽象为一个金字塔形式,从底层到顶层分析模型家族的一般构成要素和复合形式,解析干旱指数通用的数学构建规律及其物理内涵;最后,分析大气影响、土壤、传感器差异等环境影响因素,指出干旱指数未来发展重点在数据源、监测对象、表达形式三个方面.通过对干旱指数的研究工作有助于进一步完善发展干旱指数体系,推进干旱遥感监测模型在农情遥感监测、水资源规划和环境科学管理等领域的应用.

关键词：地物波谱学干旱遥感监测模型多维光谱空间