- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Device-independent witness of arbitrary-dimensional quantum systems employing binary-outcome measurements
摘要： Device-independent dimension witnesses (DWs) are a remarkable way to test the dimension of a quantum system in a prepare-and-measure scenario imposing minimal assumptions on the internal features of the devices. However, as the dimension increases, the major obstacle in the realization of DWs arises due to the requirement of many-outcome quantum measurements. In this article we propose a variant of a widely studied communication task (random access code) and take its average payoff as the DW. The presented DW applies to arbitrarily large quantum systems employing only binary-outcome measurements.
关键词： device-independent dimension witnesses,binary-outcome measurements,quantum systems,random access code
更新于2025-09-09 09:28:46
-
The configuration of DMD and the maximum intensity projection method for improving contrast in DMD-based confocal microscope
摘要： In this article, an operation strategy of digital micromirror device (DMD) and the maximum intensity projection (MIP) image processing method are proposed to improve the contrast of images in confocal microscopy. First, the configuration of DMD is demonstrated and the effect of scanning unit size on image performance is analyzed. Then, the image processing method MIP is applied. According to the MIP method, only the maximum intensity projection point of the same pixel is chosen from every image, and the maximum intensity projection point exactly corresponds to the positon where mirror is at “on” position during the scanning process in DMD-based confocal microscope system,. Thus, high contrast of images can be achieved by using MIP. Finally, experiments are conducted to verify imaging performance by changing the parameter of scanning unit size and applying a MIP image processing technique. The results show that DMD scanning unit size and MIP image processing techniques play important roles in improving image contrast. Smaller scanning unit size of DMD improves axial contrast but greatly decreases the signal to noise ratio, which thus leads to reduced image contrast. Larger scanning unit size produces a better signal to noise ratio, thus better image contrast. However, a large S will sacrifice the processing time. Therefore, DMD scanning unit size should be smaller on the premise that image contrast can be satisfied.
关键词： digital micromirror device (DMD),the maximum intensity projection image processing (MIP),image contrast,scanning unit size
更新于2025-09-09 09:28:46
-
Self-testing using only marginal information
摘要： The partial states of a multipartite quantum state may carry a lot of information: in some cases, they determine the global state uniquely. This result is known for tomographic information, that is for fully characterized measurements. We extend it to the device-independent framework by exhibiting sets of two-party correlations that self-test pure three-qubit states.
关键词： multipartite,correlations,quantum state,device-independent,self-testing
更新于2025-09-09 09:28:46
-
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
-
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
-
[IEEE 2018 IEEE International Conference on Semiconductor Electronics (ICSE) - Kuala Lumpur (2018.8.15-2018.8.17)] 2018 IEEE International Conference on Semiconductor Electronics (ICSE) - Physical Modelling and Simulation of Au/ZnO Schottky diode
摘要： A Schottky diode of Gold (Au)/ ZnO is simulated using an open source TCAD device simulator (Minimos-NT) and the effect of different device models on the electrical characteristics of ZnO Schottky diode have been studied. The simulated electrical characterization experimental results reported in [1] and the reasons for discrepancy in the results have been addressed. For effective simulation, material parameters of ZnO collected from literature published in various research papers and magazine articles were supplied to the software. Hence, development of a complete database of ZnO parameters was also aimed which will assist in future simulations of the said material.
关键词： Simulation,Schottky diode,Zinc Oxide,TCAD device simulator
更新于2025-09-09 09:28:46
-
Microdroplet electrowetting actuation on flexible paper-based lab on a chip
摘要： This paper presents the microdroplets electrowetting causing by the voltage actuation on the ?exible lab on a chip. The electrode is made of a thin Aluminium (Al) ?lm while the lab on a chip substrate is made from the cellulose paper, which is ?exible. Consistently in this work the microdroplet samples of 5 μl from Potassium Chloride (KCl) is experimented on top of the electrodes. It is shown that the ?exible paper-based lab on a EW chip has ful?lled the Lippmann’s equation where the higher the voltage supply, the lesser the interfacial tension of droplet. Moreover, the droplet has e?ciently trailed along the track of activated electrodes when using the olive oil as the dielectric layer. The olive oil with dielectric permittivity of 3.2 has given the best displacement and high velocity of the droplet transportation. The best low voltage to move the microdroplet between the two planar electrodes is 12 Vpp under the frequency of 10 Hz.
关键词： Paper-based chip,Flexible device,Aluminium electrode,Electrowetting,Microdroplet
更新于2025-09-09 09:28:46
-
Rectification in zigzag graphene/BN nanoribbon heterojunction
摘要： We investigate the effect of changed BN nanoribbon on the rectifying behavior in zigzag graphene/BN nanoribbon heterojunction using first principles based on non-equilibrium Green’s function and density functional theory. The increased BN length in the scattering region reduces the rectifying performance of the device, and the maximum rectifying ratio is 9.8×1014 in the heterojunction. We discuss the different rectifying characteristics for the designed models by calculating the transmission spectra at different biases. The rectifying phenomenon is further investigated by the projected density of state of device. Furthermore, we explain the observed negative differential resistance effect by the transmission spectra and transmission eigenstates. The results suggest that the zigzag graphene/BN nanoribbon heterojunction leads to the asymmetric current, causing the rectifying phenomenon, and the BN length in the scattering region can modulate the rectifying performance of zigzag graphene/BN nanoribbon heterojunction.
关键词： Molecular device,electronic transport,rectification
更新于2025-09-09 09:28:46
-
Arbitrary amplitude femtosecond pulse shaping via a digital micromirror device
摘要： An ultrafast spectrum programmable femtosecond laser may enhance the performance of a wide variety of scientific applications, e.g., multi-photon imaging. In this paper, we report a digital micromirror device (DMD)-based ultrafast pulse shaper, i.e., DUPS, for femtosecond laser arbitrary amplitude shaping — the first time a programmable binary device reported to shape the amplitudes of ultrafast pulses spectrum at up to 32 kHz rate over a broad wavelength range. The DUPS is highly efficient, compact, and low cost based on the use of a DMD in combination with a transmission grating. Spatial and temporal dispersion introduced by the DUPS is compensated by a quasi-4-f setup and a grating pair, respectively. Femtosecond pulses with arbitrary spectrum shapes, including rectangular, sawtooth, triangular, double-pulse, and exponential profile, have been demonstrated in our experiments. A feedback operation process is implemented in the DUPS to ensure a robust and repeatable shaping process. The total efficiency of the DUPS for amplitude shaping is measured to be 27%.
关键词： digital micromirror device,Spectrum shaping,ultrafast laser
更新于2025-09-09 09:28:46
-
Fast confocal fluorescence imaging in freely behaving mice
摘要： Fluorescence imaging in the brain of freely behaving mice is challenging due to severe miniaturization constraints. In particular, the ability to image a large field of view at high temporal resolution and with efficient out-of-focus background rejection still raises technical difficulties. Here, we present a novel fiberscope system that provides fast (up to 200 Hz) background-free fluorescence imaging in freely behaving mice over a field of view of diameter 230 μm. The fiberscope is composed of a custom-made multipoint-scanning confocal microscope coupled to the animal with an image guide and a micro-objective. By simultaneously registering a multipoint-scanning confocal image and a conventional widefield image, we subtracted the residual out-of-focus background and provided a background-free confocal image. Illumination and detection pinholes were created using a digital micromirror device, providing high adaptability to the sample structure and imaging conditions. Using this novel imaging tool, we demonstrated fast fluorescence imaging of microvasculature up to 120 μm deep in the mouse cortex, with an out-of-focus background reduced by two orders of magnitude compared with widefield microscopy. Taking advantage of the high acquisition rate (200 Hz), we measured red blood cell velocity in the cortical microvasculature and showed an increase in awake, unrestrained mice compared with anaesthetized animals.
关键词： red blood cell velocity,multipoint-scanning confocal microscope,digital micromirror device,fiberscope system,microvasculature imaging,fluorescence imaging,freely behaving mice
更新于2025-09-09 09:28:46