共查询到20条相似文献,搜索用时 180 毫秒
1.
将Tavis-Cummings模型推广到同时考虑原子运动及与光场依赖强度耦合的情况.运用原子约化熵和Concurrence操纵了该系统在真空场、弱相干场和强相干场条件下,双原子-场之间以及双原子之间纠缠演化特性.以此为依据,选择双原子与场相互作用时间、选取双原子纠缠因子、调节场模结构参数,控制系统纯态概率幅和选择测量,制备了双原子-场W类态、双原子Bell态、Bell态原子保真态、光场的单光子态、双光子态及稳定的数态.实现了双原子Bell态突然产生及有限时间内的保持、Bell态原子周期量子回声的形成及其信息(态)持续保真.结果表明,该系统具有强大的量子信息功能,为量子信息处理的实验实现提供了物理载体和理论参数. 相似文献
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Λ-型三能级单原子的辐射谱 总被引:5,自引:0,他引:5
采用时间演化算符方法,研究腔内单模光场中Λ-型三能级单原子的辐射谱,给出了辐射谱一般公式,并讨论在粒子数纯态、相干态和热辐射三种光场激励下的辐射频谱结构。 相似文献
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∧—型三能级单原子的辐射谱 总被引:2,自引:2,他引:0
采用时间演化算符方法,研究腔内单模光场中∧-型三能级单原子的辐射谱,给出了辐射谱一般公式,并讨论在粒子数纯态、相干态和热辐射三种光场激励下的辐射频谱结构。 相似文献
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两个能级原子与双模腔场的拉曼相互作用 总被引:2,自引:1,他引:1
研究了两个双能有原子与双模辐射腔场的拉曼相互作用,计算了两个原子与腔场具有相同耦合常数但同时考虑原子间偶极-偶极相互作用情形下的辐射谱,讨论了双模腔场下于不同数态时辐射新特点。 相似文献
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采用时间演化算符方法,研究A_型三能级原子与双模腔场共振相互作用的辐射谱,尤其在真空场中拉比(Rabi)分裂.给出了辐射谱一般公式.并讨论在粒子数纯态光场激励下的辐射频谱结构.结果表明:一般辐射谱呈对称的12蜂结构. 相似文献
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研究了包括任意的光场非线性和原子光场非线性依赖强度耦合J-C(Jaynes-Cummings)模型中单原子的辐射谱,分析了上述非线性对辐射谱的影响.结果表明,原子的辐射谱强烈地依赖于光场的非线性项R(a+a)及原子光场非线性耦合因子f(a+a)的形式,其谱结构与标准J-C模型中原子的辐射谱明显不同.当腔内充满的非线性介质使得f(a+a)=1/(a+a)1/2时,对于任意的初始光场态,辐射谱总是显示
关键词:
辐射谱
非线性耦合 相似文献
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采用时间演化算符方法,研究-型三能级原子与双模腔场共振相互作用的辐射谱,尤其在真空场中拉比(Rabi)分裂.给出了辐射谱一般公式。并讨论在粒子数纯态光场激励下的辐射频谱结构。结果表明:一般辐射谱呈对称的12蜂结构. 相似文献
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By means of time-evolution operator, the emission spectrum from two two-level entangled atoms in Bell states interacting with a single-mode cavity field in the Fock state has been studied in the paper. The physical spectrum expression of radiation emitted by the atoms is given out for each Bell state. In general, the spectrum shows the symmetrical multi-peak structure and the symmetrical three-peak structure with the strong optical input. Bell states composed of two identical atoms can be partially distinguished in view of the characterizations of their emission spectrum. 相似文献
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Emission Spectrum from Two Atoms in Bell States in a Cavity 总被引:5,自引:0,他引:5
1 Introduction Inrecentyears ,therehasbeenmuchinterestinentangledstatesbecauseofthedevelopmentof quantuminformation .Entanglementisoneofthemoststrikingfeaturesofquantummechanics .Anentangledstate ,as generallydefined ,cannotbeseparatedintoaproductofthesta… 相似文献
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Kaige Wang Li-ping Deng Gui-fang Dang 《量子光学学报》2006,12(B08):76-76
Two schemes for unconditionally generating two-mode motional entanglement for two ions trapped in a cavity have been proposed. The first scheme is: the vibrational mode of the first ion is coupled to the cavity field via a linear-mixing interaction and the vibrational mode of the second ion is coupled to the cavity field via an effective parametric interaction respectively. The two ions can evolve into a steady-state two-mode entangled Gaussian state, which is a mixed state. The second scheme is. the two ions are trapped in a bimodal cavity, through choosing the frequency and intensity of the driven lasers, the two ions can evolve into a two-mode entangled state, which is a pure state. 相似文献
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采用张量表示和广义三维贝尔基测量的方法,提出了实现三能级单量子态控制双向量子隐形传态的协议.协议中,控制者Carol的量子态为任意广义三维贝尔基.选择六粒子纠缠态作为量子通道,并给出了判断任意六粒子纠缠态能否作为量子通道的必要条件.基于该条件,借助SO(3)群元素的幺正性,选择其任意两个元素作为幺正矩阵,给出了构建量子通道的一般方法.列举了两个具体构建量子通道的例子,其中Alice、Bob、Carol共同作用,进行相应的广义三维贝尔基测量和对应的幺正变换,最终实现了Alice和Bob之间量子态的交换,从而验证了所提协议的可行性. 相似文献
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《Physics letters. A》2006,359(5):412-415
We propose a scheme to explore two-photon high-dimensional entanglement associated with a transverse pattern by means of two-photon interference at a beamsplitter. We find that the topological symmetry of the angular spectrum of the two-photon state governs the nature of the two-photon interference. We prove that the anti-coalescence interference is the signature of two-photon entanglement. On the basis of this feature, we propose a special Mach–Zehnder interferometer incorporated with two spiral phase plates which can change the interference from a coalescence to an anti-coalescence type only for a two-photon entangled state. The scheme is simple and straightforward compared with the test for a Bell inequality. 相似文献
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Based on tensor representation and Bell basis measurement in bidirectional quantum teleportation, a criterion that can be used to judge whether a four-qubit quantum state can be regarded as quantum channel or not in bidirectional teleportation is suggested and a theoretical scheme of bidirectional teleportation via four-qubit state as the quantum channel is proposed. In accordance with this criterion we give a general method of selecting quantum channel in bidirectional teleportation, which is determined by the channel parameter matrix R in the Bell basis measurement. This general method provide a theoretical basis for quantum channel selection in bidirectional quantum teleportation experiments. 相似文献
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Quantum state sharing of an arbitrary
multiqubit state using nonmaximally entangled GHZ states 总被引:1,自引:0,他引:1
Z.-X. Man Y.-J. Xia N. B. An 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,42(2):333-340
We explicitly present a scheme for quantum
state sharing of an arbitrary multiqubit state using nonmaximally
entangled GHZ states as the quantum channel and generalized Bell
states as the measurement basis. The scheme succeeds only
probabilistically with its total success probability depending on
the degree of entanglement matching between the quantum channel and
the generalized Bell states. Security of the scheme is guaranteed by
the fact that attacks of an outside eavesdropper or/and an inside
dishonest party will inevitably introduce detectable errors. 相似文献
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Deterministic nondestructive state analysis for polarization-spatial-time-bin hyperentanglement with cross-Kerr nonlinearity 下载免费PDF全文
We present a deterministic nondestructive hyperentangled Bell state analysis protocol for photons entangled in three degrees of freedom(DOFs),including polarization,spatial-mode,and time-bin DOFs.The polarization Bell state analyzer and spatial-mode Bell state analyzer are constructed by polarization parity-check quantum nondemolition detector(P-QND)and spatial-mode parity-check quantum nondemolition detector(S-QND)using cross-Kerr nonlinearity,respectively.The time-bin Bell state analyzer is constructed by the swap gate for polarization state and time-bin state of a photon(P-T swap gate)and P-QND.The Bell states analyzer for one DOF will not destruct the Bell states of other two DOFs,so the polarization-spatial-time-bin hyperentangled Bell states can be determinately distinguished without destruction.This deterministic nondestructive state analysis method has useful applications in quantum information protocols. 相似文献