- 标题
- 摘要
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- 实验方案
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Practical measurement-device-independent entanglement quantification
摘要： The robust estimation of entanglement is key to the validation of implementations of quantum systems. On the one hand, the evaluation of standard entanglement measures, either using quantum tomography or using quantitative entanglement witnesses, requires perfect implementation of measurements. On the other hand, measurement-device-independent entanglement witnesses (MDIEWs) can certify entanglement of all entangled states using untrusted measurement devices. We show that MDIEWs can be used as well to quantify entanglement according to standard entanglement measures, and we present a practical method to derive such witnesses using experimental data only.
关键词： quantum systems,quantum tomography,measurement-device-independent,entanglement witnesses,entanglement quantification
更新于2025-09-09 09:28:46
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Semi-device-independent characterization of multipartite entanglement of states and measurements
摘要： The semi-device-independent framework allows one to draw conclusions about properties of an unknown quantum system under weak assumptions. Here we present a semi-device-independent scheme for the characterization of multipartite entanglement based around a game played by several isolated parties whose devices are uncharacterized beyond an assumption about the dimension of their Hilbert spaces. Our scheme can simultaneously certify that an n-partite high-dimensional quantum state features genuine multipartite entanglement, and that a joint measurement on n subsystems is entangled. Moreover, it provides a lower bound on the number of entangled measurement operators. These tests are strongly robust to noise, and even optimal for certain classes of states and measurements, as we demonstrate with illustrative examples. Notably, our scheme allows the certification of many entangled states admitting a local model, which therefore cannot violate any Bell inequality.
关键词： quantum systems,Hilbert spaces,semi-device-independent,entangled measurements,multipartite entanglement
更新于2025-09-09 09:28:46
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Preparation, Characterization, Spectroscopic (FT-IR, FT-Raman, UV and Visible) Investigation, Optical and Physico Chemical Property Analysis on In2O3 Thin Films
摘要： In this work, Indium oxide (In2O3) thin film is successfully deposited on microscopic glass substrate at different temperatures by spray pyrolysis technique using InCl3 as precursor. The physical properties of these films are characterized by XRD, SEM, AFM, FT-IR, FT-Raman, UV-visible and AFM measurements. XRD analysis exposed that the structural transformation of films from stoichiometric to non-stoichiometric orientation of the plane vice versa and also found that, the film is polycrystalline in nature having cubic crystal structure with a preferred grain orientation along (222) plane. SEM and AFM studies revealed that, the film with 0.1M at 500?C has spherical grains with uniform dimension. The complete vibrational analysis has been carried out and the optimized parameters are calculated using HF and DFT (CAM-B3LYP, B3LYP and B3PW91) methods with 3-21G (d,p) basis set. Furthermore, NMR chemical shifts are calculated by using the gauge independent atomic orbital (GIAO) technique. The molecular electronic properties; absorption wavelengths, excitation energy, dipole moment and frontier molecular orbital energies, molecular electrostatic potential energy (MEP) analysis and Polarizability first order hyperpolarizability calculations are performed by time dependent DFT (TD-DFT) approach. The energy excitation on electronic structure was investigated and the assignment of the absorption bands in the electronic spectra of steady compound is discussed. The calculated HOMO and LUMO energies showed the enhancement of energy gap by the addition of substitutions with the base molecule. The thermodynamic properties (heat capacity, entropy, and enthalpy) at different temperatures are calculated and interpreted in gas phase.
关键词： Gauge independent atomic orbital,Spherical grains,Hyperpolarizability,MEP,Indium Oxide,Frontier molecular orbital energy
更新于2025-09-09 09:28:46
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Integrating Mser into a Fast ICA Approach for Improving Building Detection Accuracy
摘要： In this paper, a novel technique is presented to detect buildings from very high resolution satellite image. This work builds on the learning of ICA based building detection technique from the very high resolution (VHR) multispectral satellite images presented in [1]. The candidate building pixels obtained through ICA are used to extract maximally stable extremal regions (MSER) which are then filtered using geometric properties to obtain final potential buildings. The technique is aimed at reducing false detection at pixel-level and improving object-level performance of [1]. Combining the two works offers an unsupervised building detection technique which is robust towards size, shape, color, types of rooftops and shadows. A wider test image set consisting of 15 images of different dimensions are used to evaluate performance of the complete detection process. The combined technique achieves object-level precision and recall of 80.64% and 83.65% respectively.
关键词： VHR image,independent component analysis,Maximally stable extremal regions,Building detection
更新于2025-09-09 09:28:46
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A NOVEL POLARIZATION INDEPENDENT CHIPLESS RFID TAG USING MULTIPLE RESONATORS
摘要： A novel polarization independent RFID tag employing multiple resonators is proposed. The prototype of the tag is fabricated on a low-cost substrate of dielectric constant 4.4 and loss tangent 0.02. Designing a reader for chipless RFID is a hard task since both the polarization and operating frequency agility have to be implemented. The new tag design proposed in this paper is polarization independent, making the design of the reader easier. A prototype of a 3 bit data encoded tag is demonstrated using single structure which can be extended to any order by cascading. This new design is experimentally validated in the frequency domain using monostatic measurement with magnitude response to decode the information.
关键词： polarization independent,multiple resonators,low-cost substrate,chipless RFID tag,frequency domain
更新于2025-09-09 09:28:46
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Designing Efficient Circuits Based on Runtime-Reconfigurable Field-Effect Transistors
摘要： An early evaluation in terms of circuit design is in order to assess the feasibility and practicability essential aspects for emerging nanotechnologies. Recon?gurable nanotechnologies, such as silicon or germanium nanowire-based recon?gurable ?eld-effect transistors, hold great promise as suitable primitives for enabling multiple functionalities per computational unit. However, contemporary CMOS circuit designs when applied directly with this emerging nanotechnology often result in sub-optimal designs. For example, 31% and 71% larger area was obtained for our two exemplary designs. Hence, new approaches delivering tailored circuit designs are needed to truly tap the exciting feature set of these recon?gurable nanotechnologies. To this effect, we propose six functionally enhanced logic gates based on a recon?gurable nanowire technology and employ these logic gates in ef?cient circuit designs. We carry out a detailed comparative study for a recon?gurable multifunctional circuit, which shows better normalized circuit delay (20.14%), area (32.40%), and activity as the power metric (40%) while exhibiting similar functionality as compared with the CMOS reference design. We further propose a novel design for a 1-bit arithmetic logic unit-based on silicon nanowire recon?gurable FETs with the area, normalized circuit delay, and activity gains of 30%, 34%, and 36%, respectively, as compared with the contemporary CMOS version.
关键词： silicon nanowire (SiNW) transistor,multi-independent gate recon?gurable ?eld-effect transistor,three-independent gate ?eld-effect transistor (TIGFET),Functionally enhanced logic gates
更新于2025-09-04 15:30:14
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Temperature-independent refractive index sensor based on fiber Bragg grating and spherical-shape structure
摘要： A fiber-optic refractive index (RI) sensor consisting of a fiber Bragg grating (FBG) spliced in downstream of a spherical-shape structure in a single-mode fiber (SMF) is proposed and experimentally demonstrated. The cladding modes with different effective refractive indices can be efficiently excited by the spherical-shape structure. By measuring the difference of the wavelength shifts between the reflected cladding Bragg mode and the core mode, we have achieved a maximum sensitivity of 2.87 nm/RIU with range of the RI from 1.357 to 1.458. When the temperature changes from 25 °C to 225 °C, the relative wavelength shift between the cladding mode and the core mode has no significant changes, which indicates that this fiber-optic sensor allows for temperature-independent RI measurement.
关键词： Refractive index sensor,Temperature-independent,Spherical-shape structure,Fiber Bragg grating
更新于2025-09-04 15:30:14
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[IEEE 2018 15th European Radar Conference (EuRAD) - Madrid, Spain (2018.9.26-2018.9.28)] 2018 15th European Radar Conference (EuRAD) - Noise Removal in Near Range Active Millimeter Wave Three-dimensional Imaging System
摘要： Aimed at the noise removal in near range active millimetre wave pulse linear frequency modulation (LFM) based three-dimensional imaging system, this paper proposes a novel noise removal algorithm, which combines the independent component analysis (ICA) and Wigner-Hough transform. The algorithm is effective in noise suppression and easy to implementation. In a semi-physical simulation system, the algorithm improves the signal-to-noise ratio (SNR) of the echo signal by 10dB in standard target imaging experiment which verifies the effectiveness and feasibility of the noise removal algorithm.
关键词： Wigner-Hough transform,three-dimensional millimetre wave imaging,independent component analysis,pulse linear frequency modulation
更新于2025-09-04 15:30:14
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Real-time selection for free-space measurement device independent quantum key distribution
摘要： In consideration of the time-dependent transmittance caused by atmospheric turbulence, we combine real-time selection (RTS) method with measurement device independent quantum key distribution (MDI-QKD). The modi?ed scheme ?lters out the intervals with high channel transmittance and thus in turn increases the secure key rate. The optimal threshold of post-selection is determined by an iterative algorithm in advance, which balances the decrease in the total number of signals and the increase in average transmittance. Simulation results show that our modi?ed scheme has apparent advances in both maximum tolerant loss and secure key rate compared to the original MDI-QKD protocol. The MDI-QKD with RTS even performs better when the level of turbulence becomes larger. Furthermore, the modi?ed scheme is more stable against the statistical ?uctuation as well.
关键词： Quantum key distribution,Measurement device independent quantum key distribution,Atmospheric turbulence
更新于2025-09-04 15:30:14
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Polarization-Independent Narrowband Near-Perfect Absorption Based on One-Dimension Embedded Aluminum Grating
摘要： In the past, the polarization-insensitive absorption is realized mainly employing the two-dimensional periodic structure of fourfold rotational symmetry, which greatly increases the manufacturing complexity and cost. Here, we present the numerical design of a polarization-independent near-perfect absorber incorporating one-dimensional embedded aluminum grating. The absorption peaks near 99% at 520-nm wavelength for different polarization angles are achieved. The underlying mechanism associated with the resonance is attributed to the magnetic polariton resonance and the cavity-mode resonance for TM and TE polarization, respectively, and further explained by the inductor-capacitor circuit model and the eigen equation of cavity mode. Furthermore, the effects of geometrical parameters of the nano-cavity on the absorption performance are discussed. The proposed structure may provide a new way to achieve polarization-independent absorption with one-dimensional meta-surface, which has broad applications in plasmonic sensors, photo-detectors, and so on.
关键词： Grating,Resonance,Polarization-independent,Absorption,Narrowband
更新于2025-09-04 15:30:14