共查询到20条相似文献,搜索用时 15 毫秒
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We show how to construct a near deterministic CNOT gate using several single photons sources, linear optics, photon number resolving quantum nondemolition detectors, and feed forward. This gate does not require the use of massively entangled states common to other implementations and is very efficient on resources with only one ancilla photon required. The key element of this gate is nondemolition detectors that use a weak cross-Kerr nonlinearity effect to conditionally generate a phase shift on a coherent probe if a photon is present in the signal mode. These potential phase shifts can then be measured using highly efficient homodyne detection. 相似文献
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Dispersive averaging effects are used to show that the Korteweg-de Vries (KdV) equation with periodic boundary conditions possesses high frequency solutions, which behave nearly linearly. Numerical simulations are presented, which indicate the high accuracy of this approximation. Furthermore, this result is applied to shallow water wave dynamics in the limit of KdV approximation, which is obtained by asymptotic analysis in combination with numerical simulations of KdV. 相似文献
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J.F.C Van Velsen 《Physics Reports》1978,41(2):135-190
In this report the linear response theory of Kubo and the verification of the Kubo formula for electrical conduction by experiments and numerical calculations is reviewed. A survey of area reserving mappings is given, emphasizing the significance of these mappings for mechanics and statistical mechanics. The response of area preserving mappings with different statistical properties is calculated. The relation between the response, the statistical properties of the mappings and the fundamental assumptions of linear response theory is discussed. 相似文献
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In this study, two different approaches for the design of broadband polarization-independent wide-angle metamaterial plasmonic absorbers (MPA) are presented. The proposed MPAs are made of periodic arrays of Nickel (Ni) or Wolfram (W) cubes. The top surfaces of the cubes are texturized using silicon dioxide (SiO2). The proposed PMAs with two different optimized textures experience plasmonic resonance characteristics that enable near unity visible light absorption. The parametric studies carried on the proposed MPAs with the aid of 3D-FDTD method results in wide-angle near perfect absorption characteristic that is >?0.96 for all visible regimes. Additionally, the obtained results show almost perfect absorption of above 99% over the frequency ranges extending from?~?458 to?~?525 and?~?489 to?~?665 THz. Besides, numerical results demonstrate that the proposed PMAs also exhibit both polarization and angle independency for the whole visible regime. Further, the absorption characteristics of proposed MPAs near the infrared and ultraviolet regimes are investigated. 相似文献
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原子反射镜是人们从事原子光学实验研究的重要器件之一.本文将简单综述采用冷原子磁、光操控技术发展起来的诸如消逝波原子反射镜、半高斯光束原子反射镜、周期性磁化的磁带反射镜、周期性排列的永久磁铁反射镜和载流导线磁反射镜等各种原子反射镜的基本原理、实验方案及其最新进展,并就原子反射镜在原子光学实验中的应用作一简单介绍. 相似文献
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We review the classical theory of the free-electron laser and discuss possible applications in laser fusion, laser-induced chemistry, biochemistry, and solid-state physics. The possibility of using optical wigglers to reach the VUV and soft X-ray regimes is also analysed. 相似文献
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In this paper, we introduce the notion of a pre-symplectic algebroid and show that there is a one-to-one correspondence between pre-symplectic algebroids and symplectic Lie algebroids. This result is the geometric generalization of the relation between left-symmetric algebras and symplectic (Frobenius) Lie algebras. Although pre-symplectic algebroids are not left-symmetric algebroids, they still can be viewed as the underlying structures of symplectic Lie algebroids. Then we study exact pre-symplectic algebroids and show that they are classified by the third cohomology group of a left-symmetric algebroid. Finally, we study para-complex pre-symplectic algebroids. Associated with a para-complex pre-symplectic algebroid, there is a pseudo-Riemannian Lie algebroid. The multiplication in a para-complex pre-symplectic algebroid characterizes the restriction to the Lagrangian subalgebroids of the Levi–Civita connection in the corresponding pseudo-Riemannian Lie algebroid. 相似文献
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M. Yamazaki 《Fortschritte der Physik》2008,56(6):555-686
We review recent developments in the theory of brane tilings and four‐dimensional 𝒩 = 1 supersymmetric quiver gauge theories. This review consists of two parts. In part I, we describe foundations of brane tilings, emphasizing the physical interpretation of brane tilings as fivebrane systems. In part II, we discuss application of brane tilings to AdS/CFT correspondence and homological mirror symmetry. More topics, such as orientifold of brane tilings, phenomenological model building, similarities with BPS solitons in supersymmetric gauge theories, are also briefly discussed. This paper is a revised version of the author's master's thesis submitted to Department of Physics, Faculty of Science, the University of Tokyo on January 2008, and is based on his several papers and some works in progress [1–7]. 相似文献
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S. D. Smith FRS 《Optics & Laser Technology》1980,12(4):199-205
Properties and applications of infra-red lasers are reviewed, with particular emphasis on those likely to be fundametnally important in energy production, materials and data processing. 相似文献
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《Physics Reports》2002,358(1):1-74
An exhaustive inventory of existing order-N methodologies for the calculation of the total energy as well as the atomic forces up to 1999 has been conducted. These methodologies are discussed in terms of the key approximations involved in each method. Emphasis is placed on the roles played by these approximations and how they affect the accuracy and efficiency of the method. Issues affecting the implementation of various order-N procedures, such as the choice of the tight-binding model in the order-N tight-binding approaches and the construction of the Hamiltonian in the order-N ab initio approaches, are also discussed. Some typical examples of applications of the order-N methods to study problems of realistic sizes are presented to provide a glimpse of the capability of utilizing the order-N methods to predict the stable structures and properties of complex systems with reduced symmetry. This review is expected to serve as a clearinghouse where a single resource is provided to help guide the reader to decide, among the existing methodologies, which method can best fulfill the task at hand. 相似文献
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Wu Ya-Bo 《International Journal of Theoretical Physics》1994,33(12):2415-2427
Harmonic mappings of Riemannian manifolds are discussed by a double complex function method, and the double-complex Ernst equation and the related Bäcklund transformations are naturally derived. Further, the Ernst solution and its dual solution are obtained by two different methods, respectively. Therefore, the results obtained by A. Eris are extended to a double form. 相似文献
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Pierre Berini 《Laser \u0026amp; Photonics Reviews》2014,8(2):197-220
Surface plasmon photodetectors are of vigorous current interest. Such detectors typically combine a metallic structure that supports surface plasmons with a photodetection structure based on internal photoemission or electron‐hole pair creation. Detector architectures are highly varied, involving surface plasmons on planar metal waveguides, on metal gratings, on nano‐particles, ‐islands, or ‐antennas, or involving plasmon‐mediated transmission through one or many sub‐wavelength holes in a metal film. Properties inherent to surface plasmons, such as sub‐wavelength confinement and their ability to resonate on tiny metallic structures, are exploited to convey useful characteristics to detectors in addressing applications such as low‐noise high‐speed detection, single‐plasmon detection, near‐ and mid‐infrared imaging, photovoltaic solar energy conversion, and (bio)chemical sensing. The operating principles behind surface plasmon detectors are reviewed, the literature on the topic is surveyed, and avenues that appear promising are highlighted. 相似文献
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