928 research outputs found
Ultrafast and deterministic generation of Bell states in the ultrastrong coupling regime
We have found the special dark state solutions of the anisotropic two-qubit
quantum Rabi model (QRM), which has at most one photon, and constant
eigenenergy in the whole coupling regime. Accordingly, we propose a scheme to
deterministically generate two kinds of the two-qubit Bell states through
adiabatic evolution along the dark states. With the assistance of the Stark
shift, the generation time can be reduced to subnanosecond scales, proportional
to the reverse of the resonator frequency, with fidelity reaching 99%.
Furthermore, the other two kinds of Bell states can also be ultrafast
generated
Memory-aided Contrastive Consensus Learning for Co-salient Object Detection
Co-Salient Object Detection (CoSOD) aims at detecting common salient objects
within a group of relevant source images. Most of the latest works employ the
attention mechanism for finding common objects. To achieve accurate CoSOD
results with high-quality maps and high efficiency, we propose a novel
Memory-aided Contrastive Consensus Learning (MCCL) framework, which is capable
of effectively detecting co-salient objects in real time (~150 fps). To learn
better group consensus, we propose the Group Consensus Aggregation Module
(GCAM) to abstract the common features of each image group; meanwhile, to make
the consensus representation more discriminative, we introduce the Memory-based
Contrastive Module (MCM), which saves and updates the consensus of images from
different groups in a queue of memories. Finally, to improve the quality and
integrity of the predicted maps, we develop an Adversarial Integrity Learning
(AIL) strategy to make the segmented regions more likely composed of complete
objects with less surrounding noise. Extensive experiments on all the latest
CoSOD benchmarks demonstrate that our lite MCCL outperforms 13 cutting-edge
models, achieving the new state of the art (~5.9% and ~6.2% improvement in
S-measure on CoSOD3k and CoSal2015, respectively). Our source codes, saliency
maps, and online demos are publicly available at
https://github.com/ZhengPeng7/MCCL.Comment: AAAI 202
Effects of Vanadium doping on BaFe2As2
We report an investigation of the structural, magnetic and electronic
properties of Ba(Fe(1-x)V(x))2As2 using x-ray, transport, magnetic
susceptibility and neutron scattering measurements. The vanadium substitutions
in Fe sites are possible up to 40\%. Hall effect measurements indicate strong
hole-doping effect through V doping, while no superconductivity is observed in
all samples down to 2K. The antiferromagnetic and structural transition
temperature of BaFe2As2 is gradually suppressed to finite temperature then
vanishes at x=0.245 with the emergence of spin glass behavior, suggesting an
avoided quantum critical point (QCP). Our results demonstrate that the avoided
QCP and spin glass state which were previously reported in the superconducting
phase of Co/Ni-doped BaFe2As2 can also be realized in non-superconducting
Ba(Fe(1-x)V(x))2As2.Comment: 5 pages, 6 figure
Study on Photon Transport Problem Based on the Platform of Molecular Optical Simulation Environment
As an important molecular imaging modality, optical imaging has attracted increasing attention in the recent years. Since the physical experiment is usually complicated and expensive, research methods based on simulation platforms have obtained extensive attention. We developed a simulation platform named Molecular Optical Simulation Environment (MOSE) to simulate photon transport in both biological tissues and free space for optical imaging based on noncontact measurement. In this platform, Monte Carlo (MC) method and the hybrid radiosity-radiance theorem are used to simulate photon transport in biological tissues and free space, respectively, so both contact and noncontact measurement modes of optical imaging can be simulated properly. In addition, a parallelization strategy for MC method is employed to improve the computational efficiency. In this paper, we study the photon transport problems in both biological tissues and free space using MOSE. The results are compared with Tracepro, simplified spherical harmonics method (SPn), and physical measurement to verify the performance of our study method on both accuracy and efficiency
Th17/Treg Cells Imbalance and GITRL Profile in Patients with Hashimoto’s Thyroiditis
published_or_final_versio
Qualitative Simulation of Photon Transport in Free Space Based on Monte Carlo Method and Its Parallel Implementation
During the past decade, Monte Carlo method has obtained wide applications in optical imaging to simulate photon transport process inside tissues. However, this method has not been effectively extended to the simulation of free-space photon transport at present. In this paper, a uniform framework for noncontact optical imaging is proposed based on Monte Carlo method, which consists of the simulation of photon transport both in tissues and in free space. Specifically, the simplification theory of lens system is utilized to model the camera lens equipped in the optical imaging system, and Monte Carlo method is employed to describe the energy transformation from the tissue surface to the CCD camera. Also, the focusing effect of camera lens is considered to establish the relationship of corresponding points between tissue surface and CCD camera. Furthermore, a parallel version of the framework is realized, making the simulation much more convenient and effective. The feasibility of the uniform framework and the effectiveness of the parallel version are demonstrated with a cylindrical phantom based on real experimental results
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