共查询到20条相似文献,搜索用时 93 毫秒
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由于绝热条件几何相位量子逻辑门存在非绝热差错与退相干差错这一冲突,因此在拓扑量子计算中需要设计非绝热条件几何相门,以克服这一不足.证明螺旋光纤系统内光子有效哈密顿量恰好是一个Wang Matsumoto型哈密顿量,因此螺旋光纤系统能自动产生非绝热条件几何相移.同时还证明在螺旋光纤方案中,由极化光子与螺旋光纤相互作用哈密顿量所导致的动力学相位为零(这正是拓扑量子计算所要求的),以及在螺旋光纤系统中可以通过控制极化光子初始波矢,从而较容易获得条件初始态.总之,螺旋光纤系统方案能自动满足Wang与Matsumoto的核磁共振方案中为实现非绝热条件几何相移所提出的全部条件与要求.
关键词:
几何相位
螺旋光纤系统
Wang Matsumoto型哈密顿量
拓扑量子计算 相似文献
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正负材料交界面上光波的额外相位跃变 总被引:1,自引:0,他引:1
研究了正负材料交界面上光波因螺旋度瞬时翻转所导致的额外相位。在构造有效哈密顿量的基础之上,我们运用Lewis—Riesenfeld不变量理论及与不变量有关的么正变换方法分析和计算了这一相位。由于交界面上螺旋度倒转是一个含时过程,我们计算了其中由光子波函数获得的几何相位。光子螺旋度倒转类似数字电路0与1之间的互换操作,文中简要讨论了它可能具有的信息论意义。 相似文献
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强耦合表面极化子的激发能量 总被引:4,自引:2,他引:2
采用线性组合算符方法及幺正变换方法研究了电子与表面光学(SO)声子和体纵光学(LO)声子均为强耦合的表面极化子的激发态性质.计算了体系的有效哈密顿量、振动频率和体系由基态向第一激发态跃迁所需的激发能量. 相似文献
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We study the discrete Painlevé equations associated to the affine Weyl group which can be obtained by the implementation of a special limits of -associated equations. This study is motivated by the existence of two -associated discrete both having a double ternary dependence in their coefficients and which have not been related before. We show here that two equations correspond to two different limits of a -associated discrete Painlevé equation. Applying the same limiting procedures to other -associated equations we obtained several -related equations most of which have not been previously derived. 相似文献
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研究了Er1.0P5O14铒非晶玻璃的红外量子剪裁现象. 从吸收谱和激发光谱的计算比较中肯定了Er1.0P5O14非晶 玻璃的1537.0 nm红外荧光为多光子量子剪裁荧光. 从Er1.0P5O14非晶玻璃的可见和红外荧光发射光谱中发现激发2H11/2, 4G11/2和4G9/2能级所导致的4I13/2→4I15/2量子剪裁红外荧光很强;基于自发辐射速率、无辐射弛豫速率和能量传递速率等参数的计算,对其量子剪裁机理进行了分析.发现起源于基态的强下转换能量传递{2H11/2→4I9/2,4I15/2→4I13/2},{4G11/2→4I13/2, 4I15/2→2H11/2},{4G9/2→4F7/2,4I15/2→4I13/2}和{4G9/2→4I13/2, 4I15/2→2H11/2}是导致Er1.0P5O14非晶玻璃具有强的三光子和四光子量子剪裁红外荧光的原因.研究结果对改善太阳能电池效率有一定意义. 相似文献
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An attempt is made to synthesize Nd2Co14C compound by mechanical alloying Nd16Co76B8−xCx (0x8) alloys and subsequent annealing. Phase formation and magnetic properties of Nd2Fe14B-type Nd16Co76B8−xCx alloys and their hydrides are investigated. The Nd2Co14(B,C) phase with Nd2Fe14B-type structure is formed for Nd16Co76B8−xCx (0x7) alloys, while NdCo7Cδ phase with TbCu7-type structure is observed in Nd16Co76C8 alloy. The lattice parameter c of the Nd2Co14(B,C) phase decreases with increasing the carbon content. A limit volume of the unit cell to form the Nd2Fe14B-type structure is estimated to be 0.870 nm3. The spin-reorientation temperature TSR increases with increasing the carbon content, due to an enhancement of magnetocrystalline anisotropy caused by carbon substitution for boron. After hydrogenation, the lattice expansion is observed for Nd16Co76B8−xCx (0x7) alloys. The spin-reorientation temperature of Nd16Co76B8−xCxHy (0x7) is much lower than that of the host alloys. Some structural and magnetic properties of hypothetic Nd2Co14C and Nd2Co14CHy compounds are estimated by extrapolation. 相似文献
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