- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Gaussian channels that are eventually entanglement breaking yet asymptotically nonclassicality saving
摘要： A complete classification of single-mode bosonic Gaussian channels on the basis of being quantum-limited or entanglement breaking under n-fold composition is obtained. Parametric forms for all single-mode bosonic Gaussian channels that remain quantum-limited under n-fold composition is obtained. It is shown that the obtained parametric forms of quantum-limited amplifier, attenuator, and singular noise channels are entanglement saving, i.e., they do not break entanglement under finite n-fold composition. All other single-mode bosonic Gaussian channels, quantum limited or not, are shown to be eventually entanglement breaking. Nonclassicality breaking under multiple composition of a single-mode bosonic Gaussian channel is also studied. We outline a family of single-mode bosonic Gaussian channels that are eventually entanglement breaking, but asymptotically nonclassicality saving. We illustrate examples of channels that are eventually nonclassicality breaking, asymptotically nonclassicality breaking, and asymptotically nonclassicality saving.
关键词： quantum-limited,entanglement breaking,asymptotically nonclassicality saving,Gaussian channels,nonclassicality breaking
更新于2025-09-23 15:21:01
-
[IEEE 2018 25th IEEE International Conference on Image Processing (ICIP) - Athens, Greece (2018.10.7-2018.10.10)] 2018 25th IEEE International Conference on Image Processing (ICIP) - Scene-Adaptive Image Acquisition for Focus Stacking
摘要： Focus stacking is a promising technique to extend depth of field in general photography by fusing images captured at different focusing distances. In this paper, we propose a round-trip scene-adaptive image acquisition system to automatically capture focal stack and fuse a high quality all-in-focus image. Based on scene analysis, we cover entire depth range of the scene in the forward optical scanning and refine all objects’ focusing positions accurately in the backward scanning. With captured images, we firstly extract depth map and all-in-focus image with combination of max-gradient flow and blur kernel estimation. Secondly, a superpixel-level Gaussian Fitting is proposed to determine the next location to capture. Experiments on simulated data show that our method attain high quality all-in-focus image with fewer captured images.
关键词： all-in-focus,max-gradient-flow,image acquisition,superpixel,Gaussian-Fitting
更新于2025-09-23 15:21:01
-
Double-sided split-step MM-wave Fresnel lenses: design, fabrication and focal field measurements
摘要： Design, fabrication and focal field measurements of W-band Fresnel lenses to produce well-shaped Gaussian beams in the focal domain are presented. Two lenses, one of Teflon and another of Polyamide, have been compared in their performance with a double-sided Fresnel lens of different design, with full height of Fresnel steps. Experiments show that a good focusing ability of all the lenses is achieved. They produce the target beam according to the design. Yet, the lenses of split-step design are thinner, have lower insertion losses, and a greater focal depth as compared to more conventional Fresnel lenses.
关键词： focal fields,Fresnel lenses,Gaussian beam,MM-wave,THz applications
更新于2025-09-23 15:21:01
-
Spatial Correlated Data Monitoring in Semiconductor Manufacturing Using Gaussian Process Model
摘要： In semiconductor manufacturing, various wafer tests are conducted in each stage. The analysis and monitoring of collected wafer testing data plays an important role in identifying potential problems and improving process yield. There exists three variation sources: lot-to-lot variation, wafer-to-wafer variation and site-to-site variation, which means the measurements cannot be considered independently. However, most existing control charts for monitoring wafer quality are based on the assumption that data are independently and identically distributed. To deal with the variations, we propose a mixed-effects model incorporating a Gaussian process to account for the variations. Based on the model, two control charts are implemented to detect anomalies of the measurements which can monitor the changes of the variations and the quality of products respectively. Simulation studies and results from real applications show that this model and control scheme is effective in estimating and monitoring the variation sources in the manufacturing process.
关键词： semiconductor manufacturing,mixed-effects model,statistical process control (SPC),Gaussian process
更新于2025-09-23 15:21:01
-
Theories of Molecular Optical Spectra and Chemical Transformations: Algorithm for ab initio Calculation of the Probabilities of Chemical Reactions Using a Multiminimum Gaussian Potential
摘要： The possibility of formulating and solving the problem of chemical reaction probabilities as a problem of the molecular energy levels and their transition probabilities is considered. The features of using multiminimum Gaussian potentials in such problems are discussed. An algorithm for ab initio calculation of the chemical transformation probabilities with given initial conditions and a list of structures participating in the process is proposed. It is shown that the algorithm can be constructed using a variational procedure with basis functions corresponding to solutions of both one-dimensional problems with a multiminimum potential and problems for each well separately.
关键词： Gaussian function,molecular spectrum,chemical reaction,quantum theory of molecules
更新于2025-09-23 15:21:01
-
Continuous variable quantum teleportation via entangled Gaussian state generated by a linear beam splitter
摘要： We theoretically implement the protocol of continuous variable quantum teleportation wherein Alice and Bob share a state built by a linear beam splitter as general two-mode Gaussian entangled state. Using the non-classicality and purity of the two single-mode Gaussian states employed initially at the input of the beam splitter, the unknown state teleportation protocol is explicitly implemented in terms of squeezing and phase space quadratures. We show that fidelity of the teleported state is maximal when the gain factor g is equal to 1 and gradually decreases when g deviates from 1 on either side. We further find that teleportation fidelity decreases when one of the input states of the beam splitter is replaced by the state of thermal photons.
关键词： quantum teleportation,entanglement,Gaussian state,beam splitter,continuous variable
更新于2025-09-23 15:19:57
-
Effect of a tightly focused chirped Gaussian laser pulse on electron acceleration in helical undulator
摘要： The chirped-pulse inverse free electron laser (CIFEL) interaction has been investigated by considering a tightly focused chirped Gaussian laser pulse and a helical undulator in vacuum. We consider the more realistic description of a laser, i.e., seventh-order calculation in the spatial term and first-order calculation in the temporal term. Numerical calculations show that better electron acceleration can be achieved using a tightly focused chirped Gaussian laser pulse in the CIFEL scheme. The investigation shows that a 10 MeV electron can be accelerated up to a few giga-electron volts energy with the present available laser parameters.
关键词： CIFEL,tightly focused chirped Gaussian laser pulse,helical undulator,electron acceleration,chirped-pulse inverse free electron laser
更新于2025-09-23 15:19:57
-
Simulation of a hydrogen atom in a laser field using the time-dependent variational principle
摘要： The time-dependent variational principle is used to optimize the linear and nonlinear parameters of Gaussian basis functions to solve the time-dependent Schr?dinger equation in one and three dimensions for a one-body soft Coulomb potential in a laser field. The accuracy is tested comparing the solution to finite difference grid calculations using several examples. The approach is not limited to one particle systems and the example presented for two electrons demonstrates the potential to tackle larger systems using correlated basis functions.
关键词： laser field,time-dependent variational principle,time-dependent Schr?dinger equation,Gaussian basis functions,soft Coulomb potential
更新于2025-09-23 15:19:57
-
Numerical simulation of the surface morphology and residual stress field of IN718 alloy by Gaussian mode laser shock
摘要： Laser shock processing (LSP) is a new surface modification technology that can improve mechanical properties and extending fatigue life. The numerical simulation was utilized in this work, the IN718 alloy was treated by Gaussian mode laser with the laser pulse energy of 3?7 J, laser pulse width of 12 ns and laser spot in diameter of 3 mm. And the effects of laser pulse energy on the surface morphology and residual stress field of material was investigated. The numerical simulation results showed that after the treatment of LSP, the plastic deformation and compressive residual stress layer with a certain depth is formed on the near surface of material. The amount of the plasticity deformation of material was increased with the laser pulse energy. And the compressive residual stress in surface and the direction of depth are increased with the laser pulse energy too. With the laser pulse energy from 3?7 J, the maximum compressive residual stresses are appeared at the center of the surface corresponding to the laser spot. When the laser pulse energy is increased from 3 J–7 J, the plastic deformation in depth is increases from 0.50 μm–1.86 μm, and the maximum compressive residual stress is increased from 362 MPa–742 MPa. In conclusion, LSP can improve mechanical properties of IN718 significantly, and the laser pulse energy is the most important factor to affect the LSP effect. This work can provide a certain theoretical guidance for researchers to study the IN718 alloy treated by LSP.
关键词： Residual stress,Gaussian mode laser,Surface morphology,Laser shock processing,IN718 alloy,Laser pulse energy,Numerical simulation
更新于2025-09-23 15:19:57
-
GP-SLAM: laser-based SLAM approach based on regionalized Gaussian process map reconstruction
摘要： Existing laser-based 2D simultaneous localization and mapping (SLAM) methods exhibit limitations with regard to either efficiency or map representation. An ideal method should estimate the map of the environment and the state of the robot quickly and accurately while providing a compact and dense map representation. In this study, we develop a new laser-based SLAM algorithm by redesigning the two core elements common to all SLAM systems, namely the state estimation and map construction. Utilizing Gaussian process (GP) regression, we propose a new type of map representation based on the regionalized GP map reconstruction algorithm. With this new map representation, both the state estimation method and the map update method can be completed with the use of concise mathematics. For small- or medium-scale scenarios, our method, consisting of only state estimation and map construction, demonstrates outstanding performance relative to traditional occupancy-grid-map-based approaches in both accuracy and especially efficiency. For large-scale scenarios, we extend our approach to a graph-based version.
关键词： Gaussian process,Laser-based,Simultaneous localization and mapping
更新于2025-09-23 15:19:57