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NbN superconducting nanowire single photon detector with efficiency over 90% at 1550 nm wavelength operational at compact cryocooler temperature

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Science China(Physics,Mechanics & Astronomy) 2017年第12期60卷 26-35页

作者： WeiJun Zhang LiXing You Hao Li Jia Huang ChaoLin Lv Lu Zhang XiaoYu Liu JunJie Wu Zhen Wang XiaoMing Xie State Key Lab of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China CAS Center for excellence in superconducting electronics Shanghai 200050 China

The rapid development of superconducting nanowire single-photon detectors over the past decade has led to numerous advances in quantum information technology. The record for the best system detection efficiency at an incident photon wavelength of 1550 nm is 93%. This performance was attained from a superconducting nanowire single-photon detector made of amorphous WSi; such detectors are usually operated at sub-Kelvin temperatures. In this study, we first demonstrate superconducting nanowire single-photon detectors made of polycrystalline NbN with system detection efficiency of 90.2% for 1550-nm-wavelength photons at2.1 K, accessible with a compact cryocooler. The system detection efficiency saturated at 92.1% when the temperature was lowered to 1.8 K. We expect the results lighten the practical and high performance superconducting nanowire single-photon detectors to quantum information and other high-end applications.

关键词： detection efficiency NbN superconducting nanowire single-photon detector(SNSPD) quantum information

The 0–π Phase Transition in Epitaxial NbN/Ni_(60)Cu_(40)/NbN Josephson Junctions

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Chinese Physics Letters 2019年第4期36卷 83-86页

作者： Feng Li Wei Peng Zhen Wang Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences CAS Center for excellence in superconducting electronics University of Chinese Academy of Sciences School of Physical Science and Technology University of ShanghaiTech

We fabricate high quality superconductor/ferromagnet/superconductor(SFS) Josephson junctions using epitaxial NbN/Ni_(60)Cu_(40)/NbN trilayer heterostructures. Both experimental measurements and theoretical calculations of the ferromagnet layer thickness dependence of the Josephson critical current are performed. We observe the damped oscillation behavior of the critical current as a function of the ferromagnetic layer thickness at 4.2 K,which shows a 0–π phase transition in this type of magnetic Josephson junction. Clear 0– and reverse –0 phase transitions occur around the Ni_(60)Cu_(40) thicknesses of 3.2 and 6.7 nm. Numerical calculations based on the quasi-classical Usadel equation and the Green function fit well with the experimental results. Compared with the dirty limit, the intermediate regime without the dead layer gives better fit for our SFS Josephson junctions because of the epitaxial structure. Both of the 0-and -phase junctions show the ideal magnetic field dependence with a Fraunhofer-like pattern at 4.2 K.

关键词： experimental results dependence

Reconstructive spectrometers taper down in price

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Light(Science & Applications) 2023年第7期12卷 1180-1181页

作者： Xiaoqi Cui Yi Zhang Andreas C.Liapis Zhipei Sun QTF centre of excellence Department of Electronics and NanoengineeringAalto UniversityTietotie 3Fl-02150 EspooFinland

The development of a low-cost compact reconstructive spectrometer paves the way towards portable pm-resolution spectroscopy.

关键词： spectroscopy. constructive portable

Atomic-scale engineering of oxide interfaces yields a new family of synthetic magnetic structures

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Science Bulletin 2017年第17期62卷 1169-1170页

作者： David L.Cortie Xiaolin Wang ARC centre of excellence in Future Low-Energy electronics Technologies University of WollongongNorth WoUongongNSW 2522Australia The Institute for superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of Wollongong North WollongongNSW 2522Australia

A grand challenge in the field of magnetism is to find material systems that exhibit spin structures ranging from simple ferromagnets to exquisite non-collinear *** bulk three-dimensional(3D)materials,however,the magnetic exchange interactions are constrained by the crystal symmetry and quantum chemistry,making it challenging to adjust the intrinsic magnetic structure.A

关键词：铁磁性工程师原子尺度合成结构族氧化物交换相互作用界面

High-quality hybrid dielectric materials for 2D electronics

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Science China Materials 2023年第10期66卷 4137-4138页

作者： Faisal Ahmed Zhipei Sun QTF centre of excellence Department of Electronics and NanoengineeringAalto UniversityTietotie 3FI-02150 EspooFinland

Silicon-based field effect transistors(FETs)are the building blocks of modern electronics,serving as the ***,current silicon technology is approaching its performance-downscaling limits[1].This challenge primarily stems from the substantial decline in electron mobility as silicon-based semiconductor thickness decreases,coupled with the pronounced emergence of short-channel effects upon FET miniaturization[1,2].

关键词： dielectric corners approaching

Photon-counting chirped amplitude modulation lidar system using superconducting nanowire single-photon detector at 1550-nm wavelength

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Chinese Physics B 2018年第1期27卷 593-597页

作者：周慧何宇昊吕超林尤立星李召辉吴光张伟君张露刘晓宇杨晓燕王镇 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT)Chinese Academy of Sciences CAS Center for excellence in superconducting electronics (CENSE) State Key Laboratory of Precision Spectroscopy East China Normal University

We demonstrate a photon-counting chirped amplitude modulation （CAM） light detection and ranging （lidar） system incorporating a superconducting nanowire single-photon detector （SNSPD） and operated at a wavelength of 1550 nm. The distance accuracy of the lidar system was determined by the CAM bandwidth and signal-to-noise ratio （SNR） of an intermediate frequency （IF） signal. Owing to a short dead time （10 ns） and negligible dark count rate （70 Hz） of the SNSPD, the obtained IF signal attained an SNR of 42 dB and the direct distance accuracy was improved to 3 mm when the modulation bandwidth of the CAM signal was 240 MHz and the modulation period was 1 ms.

关键词： photon counting photodetectors lidar

Empowering neuromorphic computing with topological states

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Journal of Semiconductors 2024年第11期45卷 8-9页

作者： Faisal Ahmed Zhipei Sun QTF centre of excellence Department of Electronics and NanoengineeringAalto UniversityTietotie 3FI-02150 EspooFinland

In 1980,scientist Klaus von Klitzing discovered the quantum Hall effect[1],a groundbreaking achievement that earned him the Nobel Prize in Physics in *** discovery was a significant milestone in condensed matter physi... 详细信息

关键词： states topological quantum

Voltage-induced penetration effect in liquid metals at room temperature

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National Science Review 2020年第2期7卷 366-372页

作者： Frank F Yun Zhenwei Yu Yahua He Lei Jiang Zhao Wang Haoshuang Gu Xiaolin Wang Institute for superconducting and Electronic Materials Australian Institute for Innovative Materials University of Wollongong Laboratory of Bioinspired Smart Interfacial Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices Faculty of Physics and Electronic Sciences Hubei University ARC centre of excellence in Future Low-Energy electronics Technologies University of Wollongong

Room-temperature liquid metal is discovered to be capable of penetrating through macro-and microporous materials by applying a voltage. The liquid metal penetration effects are demonstrated in various porous materials such as tissue paper, thick and fine sponges, fabrics, and meshes. The underlying mechanism is that the high surface tension of liquid metal can be significantly reduced to near-zero due to the voltage-induced oxidation of the liquid metal surface in a solution. It is the extremely low surface tension and gravity that cause the liquid metal to superwet the solid surface, leading to the penetration phenomena. These findings offer new opportunities for novel microfluidic applications and could promote further discovery of more exotic fluid states of liquid metals.

关键词： penetration effects liquid metals surface tension porous materials superwet

Manipulating high-temperature superconductivity by oxygen doping in Bi2Sr2CaCu2O8+δ thin flakes

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National Science Review 2022年第10期9卷 112-119页

作者： Bin Lei Donghui Ma Shihao Liu Zeliang Sun Mengzhu Shi Weizhuang Zhuo Fanghang Yu Genda Gu Zhenyu Wang Xianhui Chen Key Laboratory of Strongly-Coupled Quantum Matter Physics Chinese Academy of Sciences and Department of Physics University of Science and Technology of China CAS Center for excellence in Quantum Information and Quantum Physics Department of Condensed Matter Physics and Materials Science Brookhaven National Laboratory CAS Center for excellence in superconducting electronics (CENSE) Collaborative Innovation Center of Advanced Microstructures Nanjing University

Harnessing the fascinating properties of correlated oxides requires precise control of their carrier *** to other methods,oxygen doping provides an effective and more direct way to tune the electronic properties of correlated *** several approaches,such as thermal annealing and oxygen migration,have been introduced to change the oxygen content,a continuous and reversible solution that can be integrated with modern electronic technology is much in ***,we report a novel ionic field-effect transistor using solid Gd-doped CeO2as the gate dielectric,which shows a remarkable carrier-density-tuning ability via electric-field-controlled oxygen concentration at room *** Bi2Sr2CaCu2O8+δ(Bi-2212) thin flakes,we achieve a reversible superconductor-insulator transition by driving oxygen ions in and out of the samples with electric fields,and map out the phase diagram all the way from the insulating regime to the over-doped superconducting regime by continuously changing the oxygen doping *** analysis indicates that the reversible superconductor-insulator transition for the Bi-2212 thin flakes follows the theoretical description of a two-dimensional quantum phase *** work provides a route for realizing electric-field control of phase transition in correlated ***,the configuration of this type of transistor makes heterostructure/interface engineering possible,thus having the potential to serve as the next-generation all-solid-state field-effect transistor.

关键词： high-temperature superconductivity oxygen doping electric field effect all-solid-state field effect transistor superconductor–insulator transition