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月基激光干涉仪引力波天文台
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作者 牛家树 王运永 +3 位作者 边星 韦联福 霍红庆 张晓敏 《天文学进展》 CSCD 北大核心 2024年第2期203-223,共21页
引力波是广义相对论的重要预言,引力波探测是当代物理学最活跃的前沿领域之一。引力波的发现使引力波天文学完成了从寻找引力波到研究引力波这一历史性转折,开创了引力波天文学蓬勃发展的新时代。以地球为基地的激光干涉仪引力波天文台... 引力波是广义相对论的重要预言,引力波探测是当代物理学最活跃的前沿领域之一。引力波的发现使引力波天文学完成了从寻找引力波到研究引力波这一历史性转折,开创了引力波天文学蓬勃发展的新时代。以地球为基地的激光干涉仪引力波天文台和空间引力波探测器在世界各地迅速地发展起来。随着探月工程的开展,以月球为基地的激光干涉仪引力波天文台的建造也越来越引起人们的关注。该文对月基激光干涉仪引力波天文台进行了简介:首先回顾其历史、陈述其有利条件及探测器基本参数和光学结构,展望其未来的发展前景。 展开更多
关键词 引力波 引力波探测 月球基地 激光干涉仪
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超导动态电感探测器的噪声谱分析
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作者 石中誉 代旭城 +10 位作者 王浩宇 麦展彰 欧阳鹏辉 王翼卓 柴亚强 韦联福 刘旭明 潘长钊 郭伟杰 舒诗博 王轶文 《物理学报》 SCIE EI CAS CSCD 北大核心 2024年第3期310-317,共8页
动态电感探测器容易频域集成,作为一种新兴的超导探测器件在(亚)毫米及光学波段的天文探测和阵列成像中得到了初步应用.在单像素层面,动态电感探测器的暗噪声水平是关键指标之一.本文详细介绍了一种适用于动态电感探测器的噪声功率谱分... 动态电感探测器容易频域集成,作为一种新兴的超导探测器件在(亚)毫米及光学波段的天文探测和阵列成像中得到了初步应用.在单像素层面,动态电感探测器的暗噪声水平是关键指标之一.本文详细介绍了一种适用于动态电感探测器的噪声功率谱分析方法,可以较好地平衡噪声频谱分辨率与方差性能,准确且高效地进行噪声谱分析.利用此方法,研究了两种工艺的超导铝动态电感探测器,发现在铝膜上下两层镀氮化硅膜的样品的频率噪声约为裸铝样品的25%—50%.基于这种双层氮化硅工艺,进一步研究了多种几何设计的集总结构铝动态电感探测器在不同微波功率和温度下的噪声特性,实验结果与典型的二能级系统噪声行为相符.本文的研究为动态电感探测器的噪声谱表征提供了一种标准方法,并为研制低噪声的超导铝动态电感探测器奠定了基础. 展开更多
关键词 动态电感探测器 超导谐振器 噪声谱
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中国超导电子学研究及应用进展 被引量:14
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作者 李春光 王佳 +17 位作者 吴云 王旭 孙亮 董慧 高波 李浩 尤立星 林志荣 任洁 李婧 张文 贺青 王轶文 韦联福 孙汉聪 王华兵 李劲劲 屈继峰 《物理学报》 SCIE EI CAS CSCD 北大核心 2021年第1期178-203,共26页
超导体的发现距今已有近110年了,高温超导体的发现也已经有30多年了.超导材料的电子学应用在最近一二十年取得了突破性进展.高温超导微波器件显示了比传统微波器件更优越的性能,已经在移动通信、雷达和一些特殊通信系统中取得了规模化应... 超导体的发现距今已有近110年了,高温超导体的发现也已经有30多年了.超导材料的电子学应用在最近一二十年取得了突破性进展.高温超导微波器件显示了比传统微波器件更优越的性能,已经在移动通信、雷达和一些特殊通信系统中取得了规模化应用.超导量子干涉器件以其磁场和电流测量的超高灵敏度,成为地质勘探、磁共振成像和生物磁成像等领域不可替代的手段.包括超导隧道结混频器、超导热电子混频器、超导转变沿探测器及超导单光子探测器等在内的超导传感器/探测器可以探测全波段的电磁波及各种宇宙辐射,具有接近量子极限的超高灵敏度,在地球物理、天体物理、量子信息技术、材料科学及生物医学等众多前沿领域发挥越来越重要的作用.超导参量放大器已经成为实现超导量子计算的关键器件.超导集成电路技术已被列入国际器件与系统技术路线图,成为后摩尔时代微电子领域的前沿阵地之一.在计量科学中,超导约瑟夫森效应及约瑟夫森结阵器件被广泛应用于量子电压基准和国际单位制基本单位的重新定义中.在当前的量子信息技术热潮中,超导电子学扮演重要角色,同时量子热潮也大力推动了超导电子学的发展.本文主要对近几年我国超导电子学研究和应用的现状与进展进行概括总结. 展开更多
关键词 超导电子学 高温超导微波器件 超导传感器/探测器 超导数字电路
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Exact Quantum Logic Gates with a Single Trapped Cold Ion 被引量:1
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作者 wei lian-fu LIU Shi-Yong LEI Xiao-Lin 《Chinese Physics Letters》 SCIE CAS CSCD 2001年第11期1533-1535,共3页
We present an alternative scheme to exactly implement one-qubit and two-qubit quantum gates with a single trapped cold ion driven by a travelling laser field. The internal degree of freedom of the ion acts as the targ... We present an alternative scheme to exactly implement one-qubit and two-qubit quantum gates with a single trapped cold ion driven by a travelling laser field. The internal degree of freedom of the ion acts as the target qubit and the control qubit is encoded by two Fock states of the external vibration of the ion. The conditions to realize these operations, including the duration of each applied laser pulse and Lamb-Dicke parameter, are derived. In our scheme neither the auxiliary atomic level nor the Lamb-Dicke approximation is required. The multiquantum transition between the internal and external degrees of freedom of the ion is considered. 展开更多
关键词 FIELD Dicke QUANTUM
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Quantum Gate Implementations in the Separated Ion-Traps by Fast Laser Pulses
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作者 ZHANG Miao wei lian-fu 《Chinese Physics Letters》 SCIE CAS CSCD 2012年第8期12-15,共4页
An approach is proposed to implement the universal quantum gates between the ions confined individually in the separated traps.Instead of the typical adiabatic operations,performed for manipulating the ion-ion couplin... An approach is proposed to implement the universal quantum gates between the ions confined individually in the separated traps.Instead of the typical adiabatic operations,performed for manipulating the ion-ion coupling,here the switchable couplings between ions are implemented non-adiabatically by using the fast laser pulses.Consequently,the desirable quantum gates between the ions could be implemented by using only a series of laser pulses.The proposal may be conveniently generalized to the quantum computation with the scalable ion-traps. 展开更多
关键词 QUANTUM ADIABATIC COUPLING
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Entangling a Series of Trapped Ions by Moving Cavity Bus
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作者 ZHANG Miao JIA Huan-Yu wei lian-fu 《Chinese Physics Letters》 SCIE CAS CSCD 2011年第6期160-163,共4页
Entangling multiple qubits is one of the central tasks of quantum information processing.We propose an approach to entangle a number of cold ions(individually trapped in a string of microtraps)by a moved cavity.The ca... Entangling multiple qubits is one of the central tasks of quantum information processing.We propose an approach to entangle a number of cold ions(individually trapped in a string of microtraps)by a moved cavity.The cavity is pushed to include the ions one by one with a uniform velocity and thus the information stored in former ions could be transferred to the latter ones by such a moving cavity bus.Since the positions of the trapped ions are precisely located,the strengths and durations of the ion-cavity interactions can be exactly controlled.As a consequence,by properly setting the relevant parameters,typical multi-ion entangled states,e.g.,W state for 10 ions,could be deterministically generated.The feasibility of the proposal is also discussed. 展开更多
关键词 latter PROPERLY CONSEQUENCE
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Fano Resonance and Persistent Currents in a Mesoscopic Open Ring with a Flux Loop in Side-Branch
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作者 wei lian-fu WANG Shun-jin +1 位作者 JIA Huan-yu JIE Quan-lin 《Chinese Physics Letters》 SCIE CAS CSCD 1998年第2期128-130,共3页
Persistent circulating currents in a mesoscopic open ring with side-branch structures are derived by transfer matrix method in the framework of quantum waveguide theory on networks.The behavior of transmission probabi... Persistent circulating currents in a mesoscopic open ring with side-branch structures are derived by transfer matrix method in the framework of quantum waveguide theory on networks.The behavior of transmission probability may show the Fano resonance in the presence of geometric scattering of side-branch structures.It is shown that persistent circulating currents in the main loop with equal length of both arms in the absence of magnetic Aux occur near the Fermi wave vectors where the Fano resonance appears.The numerical results show that a larger persistent current is associated with a stronger Fano resonance.The persistent circulating currents can be controlled by the Aux of side-branch structure. 展开更多
关键词 structure. CURRENTS branch
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Microwave Transmissions through Superconducting Coplanar Waveguide Resonators with Different Coupling Configurations
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作者 ZHANG Si-Lei LI Hai-Jie +6 位作者 wei lian-fu FANG Yu-Rong WANG Yi-Wen ZHOU Pin-Jia wei Qiang CAO Chun-Hai XIONG Xiang-Zheng 《Chinese Physics Letters》 SCIE CAS CSCD 2013年第8期202-204,共3页
We design and fabricate two types of superconducting niobium coplanar waveguide microwave resonators with different coupling capacitors on high purity Si substrates.Their microwave transmissions are measured at 20 mK.... We design and fabricate two types of superconducting niobium coplanar waveguide microwave resonators with different coupling capacitors on high purity Si substrates.Their microwave transmissions are measured at 20 mK.It is found that these two types of resonators possess significantly different loaded quality factors;one is 5.6×10^(3) and the other is 4.0×10^(4).The measured data are fitted well by classical ABCD matrix approach and consequently the coupling capacitances are determined.It is found that the transmission peak deviates from the standard Lorentizian with a frequency broadening. 展开更多
关键词 WAVEGUIDE WAVEGUIDE MICROWAVE
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