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The continuous-time quantum walk(CTQW) is the quantum analogue of the continuous-time classical walk and is widely used in universal quantum computations. Here, taking the advantages of the waveguide arrays, we implement large-scale CTQWs on chips. We couple the single-photon source into the middle port of the waveguide arrays and measure the emergent photon number distributions by utilizing the fiber coupling platform. Subsequently, we simulate the photon number distributions of the waveguide arrays by considering the boundary conditions. The boundary conditions are quite necessary in solving the problems of quantum mazes. 相似文献
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Monolayer transition-metal dichalcogenides(TMDs) have attracted a lot of attention for their applications in optics and optoelectronics.Molybdenum disulfide(MoS_2),as one of those important materials,has been widely investigated due to its direct band gap and photoluminescence(PL) in visible range.Owing to the fact that the monolayer MoS_2 suffers low light absorption and emission,surface plasmon polaritons(SPPs) are used to enhance both the excitation and emission efficiencies.Here,we demonstrate that the PL of MoS_2 sandwiched between 200-nm-diameter gold nanoparticle(Au NP) and 150-nm-thick gold film is improved by more than 4 times compared with bare MoS_2 sample.This study shows that gap plasmons can possess more optical and optoelectronic applications incorporating with many other emerging two-dimensional materials. 相似文献
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Mechanical properties of the thermal equilibrium Friedmann–Robertson–Walker universe model 下载免费PDF全文
The mechanical property of the thermal-equilibrium Friedmann-Robertson-Walker (TEFRW) universe is first studied. The equation of state and the scale factor of the TEFRW universe take the forms ofw = w(a;zT) and a = a(a;zT,Ho). For the universe consisting of the nonrelativistic matter and the dark energy, the behavior of the dark energy depends on the value of the present-day matter fraction. For the TEFRW universe consisting of N ingredients, the effective temperature is introduced. Lastly, a simple TEFRW universe model is analyzed. 相似文献
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低碳烯烃(乙烯、丙烯等)作为石油化工的基本原料是现代化学工业的基石,也是我国国民经济发展的重要组成部分。然而,其生产过程常伴随着分离困难且能耗较高等问题。金属有机骨架(MOF)材料作为第三代新型多孔材料,因其具有高孔隙率、大比表面积、孔尺寸高度可调、结构多样等优点,在低碳烯烃分离领域表现出巨大的潜能。本文综述了MOF材料在低碳烯烃吸附分离领域的研究现状,包括MOF的分离机理和针对不同分离任务所采用的孔径调节、配体修饰、吸附位点构筑等策略,重点总结了本课题组近几年关于MOF在低碳烯烃分离方面取得的研究进展,并对未来的工业化应用进行了展望。 相似文献
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从伺服测试的角度论述了1553B总线在航天领域的应用发展历程、在伺服测试领域应用1553B总线的技术积累过程。对于基于1553B总线的伺服测试软件开发中经常遇到的问题,提出了一种作为1553B总线BC端的软件实现架构,并在此基础上实现了基于C 语言的通用1553B伺服测试类库。经过近十年的应用,经历了多个型号、近百次大型试验的考核,证明了其稳定性和可靠性,已经成为伺服测试领域1553B总线的基础解决方案。该类库对伺服测试软件模块化、通用化、产品化具有借鉴意义。 相似文献
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通过在N型分布布拉格反射镜(DBR)中采用高热导率AlAs材料,且增加AlAs层所占的厚度比例,在保持DBR反射率基本不变的情况下,大幅度增加了N型DBR的热导率,提高了器件高温工作性能。制作了氧化限制型顶发射VCSEL器件,不同温度条件下的直流测试结果表明:25℃时热反转功率超过8 mW;85℃时热反转电流为11 mA,功率达5 mW,表现出较好的高温工作特性。远场发散角小于17°。0~70℃的温度条件下眼图都较清晰,表明器件满足高温25 Gbit/s工作要求。 相似文献
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在湿法氧化过程中采用一种自制的新型红外光源显微镜和CCD相机俯视成像系统监测被氧化晶圆片上氧化标记点颜色的变化,通过CCD相机得到的氧化标记点尺寸大小与实际氧化标记点尺寸大小的比例计算,由氧化标记点变化颜色的尺寸大小获得实际晶圆被氧化尺寸大小,反馈调节氧化工艺,保证控制垂直腔面发射激光器(VCSELs)的氧化孔径精度在±1 μm。根据氧化实验总结高Al组分含量对氧化孔形状影响、氧化速率随温度变化及氧化深度随时间变化规律,得到在炉温420℃、水浴温度90℃、氧化载气N2流量200 mL/min的工艺条件下,氧化速率为0.31 μm/min,实现量产高速调制4×25 Gbit/s的850 nm VCSELs。室温条件下,各子单元器件工作电压为2.2 V,阈值电流为0.8 mA,斜效率为0.8 W/A。在6 mA工作电流下,光功率为4.6 mW。 相似文献