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Defects in silicon carbide have been explored as promising spin systems in quantum technologies. However, for practical quantum metrology and quantum communication, it is critical to achieve the on-demand shallow spin-defect generation. In this work, we present the generation and characterization of shallow silicon vacancies in silicon carbide by using different implanted ions and annealing conditions. The conversion efficiency of silicon vacancy of helium ions is shown to be higher than thatarXiv:1810.11252v1 fatcat:pcg7fbehwbfnvpylfjpsgu7n6y
more »... carbon and hydrogen ions in a wide implanted fluence range. Furthermore, after optimizing annealing conditions, the conversion efficiency can be increased more than 2 times. Due to the high density of the generated ensemble defects, the sensitivity to sense a static magnetic field can be research as high as , which is about 15 times higher than previous results. By carefully optimizing implanted conditions, we further show that a single silicon vacancy array can be generated with about 80 % conversion efficiency, which reaches the highest conversion yield in solid state systems. The results pave the way for using on-demand generated shallow silicon vacancy for quantum information processing and quantum photonics.
In spite of enormous theoretical and experimental progresses in quantum uncertainty relations, the experimental investigation of most current, and universal formalism of uncertainty relations, namely majorization uncertainty relations (MURs), has not been implemented yet. A significant problem is that previous studies on the classification of MURs only focus on their mathematical expressions, while the physical difference between various forms remains unknown. First, we use a guessing gamearXiv:1912.13383v1 fatcat:3jzlcuqxknct3h26ludz2bd3be
more »... lism to study the MURs, which helps us disclosing their physical nature, and distinguishing the essential differences of physical features between diverse forms of MURs. Second, we tighter the bounds of MURs in terms of flatness processes, or equivalently, in terms of majorization lattice. Third, to benchmark our theoretical results, we experimentally verify MURs in the photonic systems.
Morphology of the films was observed by field emission scanning electron microscopy (FESEM, Hitachi S-4800) and field emission transmission electron microscopy (FETEM, FEI Tecnai G 2 F20). ...doi:10.1364/oe.18.002621 pmid:20174091 fatcat:aav5tsa5hff5dhj6bdtnigjzgq
基于银纳米线电极-rGO敏感材料的柔性NO 2 气体传感器 Flexible nitrogen dioxide gas sensor based on reduced graphene oxide sensing material using silver nanowire electrodedoi:10.7498/aps.69.20200987 fatcat:subunptelzc5vfrihvn4h63bwq
Uncertainty relation is not only of fundamental importance to quantum mechanics, but also crucial to the quantum information technology. Recently, majorization formulation of uncertainty relations (MURs) have been widely studied, ranging from two measurements to multiple measurements. Here, for the first time, we experimentally investigate MURs for two measurements and multiple measurements in the high-dimensional systems, and study the intrinsic distinction between direct-product MURs andarXiv:1901.00853v1 fatcat:ehuc7st3arhofarekbx27wewva
more »... t-sum MURs. The experimental results reveal that by taking different nonnegative Schur-concave functions as uncertainty measure, the two types of MURs have their own particular advantages, and also verify that there exists certain case where three-measurement majorization uncertainty relation is much stronger than the one obtained by summing pairwise two-measurement uncertainty relations. Our work not only fills the gap of experimental studies of majorization uncertainty relations, but also represents an advance in quantitatively understanding and experimental verification of majorization uncertainty relations which are universal and capture the essence of uncertainty in quantum theory.
Giant cell tumor of bone (GCT), which frequently occurs in the patients' spine, is relatively prevalent in Chinese population. A group of GCT invades into vessels and appears to be circulating tumor cells (CTCs) responsible for the distal metastasis of the primary tumor. So far the cell surface markers of GCT have not been determined. In the current study, we aimed to identify a novel CTC marker with higher specificity in GCT. TRAIL-R1+ cells were purified from GCT cell lines. The TRAIL-R1+doi:10.18632/oncotarget.17042 pmid:28881598 pmcid:PMC5584197 fatcat:kjybfcfxhnd5fmwtpfheehqg4m
more »... s were compared with total GCT cells for tumor sphere formation, chemo-resistance, tumor formation in nude mice, and frequency of developing distal metastases. We found that TRAIL-R1+ GCT cells appeared to be highly enriched for CTCs in GCT. Compared to total GCT cells, TRAIL-R1+ GCT cells generated significantly more tumor spheres in culture, were higher chemo-resistant, and had a higher frequency of being detected in the circulation after subcutaneous transplantation as well as development of distal metastases. Thus, we conclude that TRAIL-R1+ may be a novel CTC marker in GCT. Selective elimination of TRAIL-R1+ GCT cells may improve the current GCT therapy.
Solid-state color centers with manipulatable spin qubits and telecom-ranged fluorescence are ideal platforms for quantum communications and distributed quantum computations. In this work, we coherently control the nitrogen-vacancy (NV) center spins in silicon carbide at room temperature, in which telecom-wavelength emission is detected. We increase the NV concentration six-fold through optimization of implantation conditions. Hence, coherent control of NV center spins is achieved at roomarXiv:1909.12481v2 fatcat:skm6r5pz2fd6boqmjphjy76que
more »... ture and the coherence time T2 can be reached to around 17.1 μs. Furthermore, investigation of fluorescence properties of single NV centers shows that they are room temperature photostable single photon sources at telecom range. Taking advantages of technologically mature materials, the experiment demonstrates that the NV centers in silicon carbide are promising platforms for large-scale integrated quantum photonics and long-distance quantum networks.
Guo ... TEM images, HRTEM images and SAED patterns were recorded with a fi eld emission transmission electron microscope (FEI Tecnai G 2 F20). ... Guo, J. Zhang, M. Wang, Y. Tian, Prof. Q. Liu National Center for Nanoscience and Technology, China, No. 11 Beiyitiao Zhongguancun, Beijing 100190, China E-mail: firstname.lastname@example.org M. Wang, Prof. Q. ...doi:10.1002/smll.201300777 pmid:23754697 fatcat:fpmwehohlfbpfm4vxqyae2vjpa
Spin defects in silicon carbide (SiC) with mature wafer-scale fabrication and micro/nano-processing technologies have recently drawn considerable attention. Although room temperature single-spin manipulation of colour centres in SiC has been demonstrated, the typically detected contrast is less than 2$\%$, and the photon count rate is also low. Here, we present the coherent manipulation of single divacancy spins in 4H-SiC with a high readout contrast ($-30\%$) and a high photon count rate (150doi:10.1093/nsr/nwab122 fatcat:xdi7vgrxgrahbiyn4swiontp2y
more »... ilo counts per second) under ambient conditions, which are competitive with the nitrogen-vacancy (NV) centres in diamond. Coupling between a single defect spin and a nearby nuclear spin is also observed. We further provide a theoretical explanation for the high readout contrast by analysing the defect levels and decay paths. Since the high readout contrast is of utmost importance in many applications of quantum technologies, this work might open a new territory for SiC-based quantum devices with many advanced properties of the host material.
Recently, vacancy-related spin defects in silicon carbide (SiC) have been demonstrated to be potentially suitable for versatile quantum interface building and scalable quantum network construction. Significant efforts have been undertaken to identify spin systems in SiC and to extend their quantum capabilities using large-scale growth and advanced nanofabrication methods. Here we demonstrated a type of spin defect in the 4H polytype of SiC generated via hydrogen ion implantation witharXiv:2004.06261v1 fatcat:rjncsv45lnfdnnnkqnqe65dczi
more »... ature post-annealing, which is different from any known defects. These spin defects can be optically addressed and coherently controlled even at room temperature, and their fluorescence spectrum and optically detected magnetic resonance spectra are different from those of any previously discovered defects. Moreover, the generation of these defects can be well controlled by optimizing the annealing temperature after implantation. These defects demonstrate high thermal stability with coherently controlled electron spins, facilitating their application in quantum sensing and masers under harsh conditions.
The aim of the study was to explore the effects of microRNA-107 (miR-107) by targeting Dkk-1 on osteosarcoma (OS) via the Wnt/b-catenin signaling pathway. Methods: OS and adjacent tissues were collected from 67 patients diagnosed with OS. Expressions of miR-107, Dkk-1, LRP5, b-catenin, and c-Myc were detected by the quantitative real-time polymerase chain reaction (qRT-PCR) and Western blotting. The dual-luciferase reporter gene assay was performed to observe the relationship between miR-107doi:10.1097/md.0000000000007245 pmid:28682874 pmcid:PMC5502147 fatcat:oi3ihu25r5g2pftexrcmij2ib4
more »... Dkk-1.Transfected cells were divided into different investigating groups designated as Inhibitor, Mimic, siRNA, Inhibitor + siRNA, negative control (NC), and blank groups. qRT-PCR and Western blotting were used to detect expressions of miR-107, Dkk-1, b-catenin, Bcl-2, c-Myc, Caspase-3, and PARP. Cell counting kit-8 (CCK-8), flow cytometry (FCM), colony-formation efficiency (CFE), and subcutaneous tumorigenicity assays were all utilized for to determine cell proliferation, apoptosis, colony-forming, and tumorigenic abilities. Results: Dkk-1 is the target gene of miR-107. Decreased expressions of miR-107, LRP5, b-catenin, and c-Myc, and increased expressions of Dkk-1 were found in OS tissues. The Mimic and siRNA groups exhibited decreased proliferation rates, colony-forming abilities, and tumorigenicity and increased apoptosis rates, whereas the inhibitor group showed opposite trends when compared to the blank group. On the other hand, expressions of miR-107, LRP5, b-catenin, c-Myc, Caspase-3, and PARP were all elevated in the mimic group, whereas expressions of Dkk-1 and Bcl-2 were reduced; opposite trends were observed in the inhibitor group. Conclusion: We conclude that miR-107 is likely to inhibit the occurrence and development of OS by down-regulating Dkk-1 via the Wnt/b-catenin signaling pathway, providing us with a new therapeutic target for the treatment of OS. Abbreviations: CCK-8 = cell counting kit-8, FCM = flow cytometry, NC group = negative control sequence, OS = osteosarcoma, qRT-PCR = quantitative real-time polymerase chain reaction.
doi:10.1038/ncomms4121 pmid:24469072 fatcat:25qgfmyt65hzjn3nfpsxf7v7py
Solar energy CF Guo et al 8 Abbott D. Keeping the energy debate clean: how do we supply the world's energy needs? ... Solar energy CF Guo et al 6 Figure 8 8 Absorptance of DPIM structure with periodic and aperiodic structures. A schematic view of the DPIM structure is shown in the inset. ...doi:10.1038/lsa.2014.42 fatcat:4ecdashjmrgsrilwp424nnnsay
, high resolution transmission electron microscopy (HR-TEM) observations and selective area electron diffraction (SAED) were performed using a field emission transmission electron microscope (FE-TEM, FEI ...doi:10.1039/c4cp04520c pmid:25429677 fatcat:isk6vehjanaxfoesz5lhamdbna
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