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Calibration of the cryogenic measurement system of a resonant haloscope cavity

Chinese Physics C 2024年第7期48卷 31-37页

作者：贺冬樊洁高昕高宇 Nick Houston 姬忠庆金贻荣李闯李金勉李田军刘世航牛家树彭智慧孙亮孙铮王佳卫镨先吴利娜相忠诚杨峤立张驰张文星张欣郑东宁郑瑞丰周建勇 Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Institute of Physics Chinese Academy of SciencesBeijing 100190China College of Physics Sichuan UniversityChengdu 610065China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Institute of Theoretical Physics Faculty of ScienceBeijing University of TechnologyBeijing 100124China Beijing Academy of Quantum Information Sciences Beijing 100193China College of Mechanical and Electrical Engineering Wuyi UniversityNanping 354300China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Institute of Theoretical Physics Shanxi UniversityTaiyuan 030006China College of Physics and Optoelectronic Engineering Department of PhysicsJinan UniversityGuangzhou 510632China School of Sciences Xi'an Technological UniversityXi'an 710021China Tsung-Dao Lee Institute and School of Physics and Astronomy Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China National Astronomical Observatories Chinese Academy of Sciences20ADatun RoadChaoyang DistrictBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

Possible light bosonic dark matter interactions with the Standard Model photon have been searched using microwave resonant *** this paper,we describe the cryogenic readout system calibration of a 7.138 GHz copper cavity with a loaded quality factor Q_(1)=10^(4)whose operation at a temperature of 22 mK is based on a dilution *** readout system consists of High Electron Mobility Transistors working as cryogenic amplifiers at 4 K,plus room-temperature amplifiers and a spectrum analyzer for signal power *** tested the system with a superconducting two-level system based on a single-photon source in the microwave frequency *** obtained an overall 95.6 dB system gain and–71.4 dB attenuation in the cavity's input *** effective noise temperature of the measurement system is 7.5 K.

关键词： dark matter superconducting two-level system Mollow triplet

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Anisotropy of Bi_(2)Sr_(2)CaCu_(2)O_(y) Superconducting Single Crystals Under High Pressure

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Chinese Physics Letters 1991年第1期8卷 29-32页

作者： LIU Zhenxing zheng dongning YAN Yifeng WANG Jihong WANG Lijun ZHAO Zhongxian Institute of Physics Academia SinicaBeijing 100080

It is shown that there exists the anisortropic nature of pressure dependence for the superconducting transition temperature and resistivity in Bi_(2)Sr_(2)CaCu_(2)O_(y) single *** maximum superconducting critical temperature and the minimum resistance along a-b plane under about 8kbar have been observed,no obvtous structure phase transition was observed at room temperature under pressure,and there is not the same behaviour along the c axis up to 13kba.r.A slight difference between the rates dT_(c)/dP along a-6 plane and c axis was also *** anisotropy may have close relation to the coupling between layers.

关键词： resistance plane Crystal

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Growth and in situ high-pressure reflection high energy electron difraction monitoring of oxide thin films

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Science China(Physics,Mechanics & Astronomy) 2013年第12期56卷 2312-2326页

作者： LI Jie PENG Wei CHEN Ke WANG Ping CHU HaiFeng CHEN YingFei zheng dongning Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences

Interface and surface physics is an important sub-discipline within condensed matter physics in recent decades. Novel concepts like oxide-electronic device are prompted, and their performance and lifetime are highly dependent on the flatness and abruptness of the layer surfaces and interfaces. Reflection high-energy electron diffraction （RHEED）, which is extremely sensitive to surface morphology, has proven to be a versatile technique for the growth study of oxide thin films. A differential pumping unit enables an implementation of RHEED to pulsed laser deposition （PLD） systems, ensuring an in situ monitoring of the film growth process in a conventional PLD working oxygen pressure up to 30 Pa. By optimizing the deposition conditions and analyzing the RHEED intensity oscillations, layer-by-layer growth mode can be attained. Thus atomic control of the film surface and unit-cell control of the film thickness become reality. This may lead to an advanced miniaturization in the oxide electronics, and more importantly the discovery of a range of emergent physical properties at the interfaces. Herein we will briefly introduce the principle of high-pressure RHEED and summarize our main results relevant to the effort toward this objective, including the growth and characterization of twinned Laz/3Caj/3MnO3 thin films and ReTiO〉6/2 （Re = La, Nd; ~5 = 0 - 1） AnBnO3n＋2 structures, on YSZ-buffered ＇Silicon on Insulator＇ and LaA103 substrates, respectively, as well as the study of the initial structure and growth dynamics of YBazCu307-6 thin films on SrTiO3 substrate. Presently we have realized in situ monitoring and growth mode control during oxide thin film deposition process.

关键词： RHEED oxide thin film pulsed laser deposition interface

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Fringe visibility and distinguishability in two-path interferometer with an asymmetric beam splitter

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Chinese Physics B 2019年第3期28卷 109-113页

作者： Yanjun Liu Jing Lu Zhihui Peng Lan Zhou dongning zheng Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center of Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Beijing National Laboratory for Condnesed Matter Physics and Institute of Physics Beijing 100190China CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory DongguanGuangdong 523808China

We study the fringe visibility and the distinguishability of a general Mach-Zehnder interferometer with an asymmetric beam splitter. Both the fringe visibility V and the distinguishability D are affected by the input state of the particle characterized by the Bloch vector S =(S_x, S_y, S_z) and the second asymmetric beam splitter characterized by the paramterβ. For the total system is initially in a pure state, it is found that the fringe visibility reaches the upper bound and the distinguishability reaches the lower bound when cosβ=-S_x, The fringe visibility obtain the maximum only if S_x = 0 and β = π/2 when the input particle is initially in a mixed state. The complementary relationship V^2 +D^2 ≤ 1 is proved in a general Mach-Zehnder interferometer with an asymmetric beam splitter, and the conditions for the equality are also presented.

关键词： complementarity fringe visibility distinguishability general Mach–Zehnder interferometer

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A trilayer process for the fabrication of Al phase qubits

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Science China(Physics,Mechanics & Astronomy) 2013年第12期56卷 2377-2380页

作者： XUE GuangMing YU HaiFeng TIAN Ye DENG Hui LIU WeiYang REN YuFeng YU HongWei zheng dongning ZHAO ShiPing Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences

Herein we develop an Al/AlOx/Al trilayer process, feasible to fabricate complex circuits with wiring crossovers, for the preparation of A1 junctions and phase qubits. The AlOx layer is obtained by in situ thermal oxidation, which provides high-quality junction tunnel barriers. The A1 junctions show a considerably low leakage current and the Josephson critical current density can be conveniently controlled in the range of a few to above 100 A/cm2, which is favorable in the phase qubit application. Macroscopic quantum tunneling, energy spectrum, energy relaxation time, Rabi oscillation, and Ramsey interference of the A1 phase qubits are measured, demonstrating clearly quantum coherent dynamics with a timescale of 10 ns. Further improvements of the coherent dynamic properties of the device are discussed.

关键词： Josephson junction trilayer process superconducting qubit

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Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

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Science China(Physics,Mechanics & Astronomy) 2010年第7期53卷 1180-1186页

作者： CHU HaiFeng LI Jie LI Shao ZHANG Yu WANG Ning WANG Jia GAO YanLi DENG Hui SUN XiaoSong zheng dongning National Laboratory for Superconductivity Institute of Physics and National Laboratory for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering Sichuan UniversityChengdu 610064China

We prepared a series of β-FeSe samples with a nominal composition of Fe1.11Se1-xSbx(0≤x≤0.5).The X-ray diffraction,transport and magnetic measurements were performed on these samples to investigate the structure,the superconducting properties and the normal state transport and magnetic *** the X-ray diffraction data suggested that Sb atoms were not incorporated into the β-FeSe phase,the transport data showed observable changes of superconductivity,normal state resistivity and *** was represented by the increase in the superconducting transition temperature and the upper critical ***,for the samples with a low level of Sb content,a clear decrease of the normal state resistivity and a substantial increase of the residual resistance ratio were ***,the samples showed a significant increase of the normal state magnetoresistance that appeared not to follow the Kohler's *** results were discussed in the frame of reduction of excess Fe at interstitial sites of β-FeSe.

关键词： iron-based superconductor superconductivity magnetoresistance

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Modulation of energy spectrum and control of coherent microwave transmission at single-photon level by longitudinal field in a superconducting quantum circuit

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Chinese Physics B 2018年第7期27卷 339-344页

作者： Xueyi Guo Hui Deng Hekang Li Pengtao Song Zhan Wang Luhong Su Jie Li Yirong Jin dongning zheng Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

We study the effect of longitudinally applied field modulation on a two-level system using superconducting quantum circuits. The presence of the modulation results in additional transitions and changes the magnitude of the resonance peak in the energy spectrum of the qubit. In particular, when the amplitude ,λz and the frequency COl of the modulation field meet certain conditions, the resonance peak of the qubit disappears. Using this effect, we further demonstrate that the longitudinal field modulation of the Xmon qubit coupled to a one-dimensional transmission line could be used to dynamically control the transmission of single-photon level coherent resonance microwave.

关键词： longitudinal field modulation (LFM) superconducting quantum circuit microwave photonics

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Hardware for multi-superconducting qubit control and readout

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Chinese Physics B 2021年第11期30卷 214-222页

作者： Zhan Wang Hai Yu Rongli Liu Xiao Ma Xueyi Guo Zhongcheng Xiang Pengtao Song Luhong Su Yirong Jin dongning zheng Institute of Physics Chinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum Information Sciences Beijing 100193China Beijing Liuhe Lianchuang Technology Co. Ltd.Beijing 100011China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

We have developed an electronic hardware system for the control and readout of multi-superconducting qubit *** hardware system is based on the design ideas of good scalability,high synchronization and low *** system,housed inside a VPX-6U chassis,includes multiple arbitrary-waveform generator(AWG)channels,analog-digital-converter(ADC)channels as well as direct current source *** system can be used for the control and readout of up to twelve superconducting transmon qubits in one chassis,and control and readout of more and more qubit can be carried out by interconnecting the *** using field programmable gate array(FPGA)processors,the system incorporates three features that are specifically useful for superconducting qubit ***,qubit signals can be processed using the on-board FPGA after being acquired by ADCs,significantly reducing data processing time and data amount for storage and ***,different output modes,such as direct output and sequential output modes,of AWG can be implemented with pre-encoded ***,with data acquisition ADCs and control AWGs jointly controlled by the same FPGA,the feedback latency can be reduced,and in our test a 178.4 ns latency time is *** is very useful for future quantum feedback ***,we demonstrate the functionality of the system by applying the system to the control and readout of a 10 qubit superconducting quantum processor.

关键词： superconducting qubit dispersive readout arbitrary-waveform generator(AWG) analog-digital converter(ADC)

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Fabrication of Josephson parameter amplifier and its application in squeezing vacuum fluctuations

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Chinese Physics B 2021年第12期30卷 640-647页

作者： Pengtao Song Xueyi Guo Kai Xu Xiaohui Song Zhan Wang Zhongcheng Xiang Hekang Li Luhong Su Yirong Jin dongning zheng Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

Josephson parameter amplifier(JPA)is a microwave signal amplifier device with near-quantum-limit-noise *** has important applications in scientific research fields such as quantum computing and dark matter *** work reports the fabrication and characterization of broadband JPA devices and their applications in multi-qubit readout and squeezing of vacuum *** use a process in which transmission lines and electrodes are made of niobium thin film and aluminum Josephson junctions are made by Dolan bridge *** believe this process is more convenient than the process we used *** whole production process adopts electron beam lithography technology to ensure high structural *** test result shows that the gain value of the manufactured JPA can exceed 15 dB,and the amplification bandwidth is about 400 *** noise temperature is about 400 mK at the working frequency of 6.2 *** devices have been successfully used in experiments involving superconducting multi-qubit quantum ***,the device is applied to squeeze vacuum fluctuations and a squeezing level of 1.635 dB is achieved.

关键词： Josephson parameter amplifier squeezed state quantum computing

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Observation of the exceptional point in superconducting qubit with dissipation controlled by parametric modulation

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Chinese Physics B 2021年第10期30卷 66-72页

作者： Zhan Wang Zhongcheng Xiang Tong Liu Xiaohui Song Pengtao Song Xueyi Guo Luhong Su He Zhang Yanjing Du dongning zheng Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China China University of Geosciences Beijing 100083China

Open physical systems described by the non-Hermitian Hamiltonian with parity-time-reversal(PT)symmetry show peculiar phenomena,such as the presence of an exceptional point(EP)at which the PT symmetry is broken and two resonant modes of the Hamiltonian become *** the EP,the system could be more sensitive to external perturbations and this may lead to enhanced *** this paper,we present experimental results on the observation of PT symmetry broken transition and the EP using a tunable superconducting *** quantum system of investigation is formed by the two levels of the qubit and the energy loss of the system to the environment is controlled by a method of parametric modulation of the qubit *** method is simple with no requirements for additional elements or qubit device *** believe it can be easily implemented on multi-qubit devices that would be suitable for further exploration of non-Hermitian physics in more complex and diverse systems.

关键词： exceptional point parity-time-reversal(PT)symmetry longitudinal field modulation

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