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1. Optimization of Controlled-Z Gate with Data-Driven Gradient Ascent Pulse Engineering in a Superconducting Qubit System

Author

Zong, Zhiwen, Sun, Zhenhai, Dong, Zhangjingzi, Run, Chongxin, Xiang, Liang, Zhan, Ze, Wang, Qianlong, Fei, Ying, Wu, Yaozu, Jin, Wenyan, Xiao, Cong, Jia, Zhilong, Duan, Peng, Wu, Jianlan, Yin, Yi, and Guo, Guoping

Subjects
Quantum Physics
Abstract

The experimental optimization of a two-qubit controlled-Z (CZ) gate is realized following two different data-driven gradient ascent pulse engineering (GRAPE) protocols in the aim of optimizing the gate operator and the output quantum state, respectively. For both GRAPE protocols, the key computation of gradients utilizes mixed information of the input Z-control pulse and the experimental measurement. With an imperfect initial pulse in a flattop waveform, our experimental implementation shows that the CZ gate is quickly improved and the gate fidelities subject to the two optimized pulses are around 99%. Our experimental study confirms the applicability of the data-driven GRAPE protocols in the problem of the gate optimization.

Published
2021
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2. Experimental Determination of Electronic States via Digitized Shortcut-to-Adiabaticity and Sequential Digitized Adiabaticity

Author

Zhan, Ze, Run, Chongxin, Zong, Zhiwen, Xiang, Liang, Fei, Ying, Sun, Zhenhai, Wu, Yaozu, Jia, Zhilong, Duan, Peng, Wu, Jianlan, Yin, Yi, and Guo, Guoping

Subjects
Quantum Physics
Abstract

A combination of the digitized shortcut-to-adiabaticity (STA) and the sequential digitized adiabaticity is implemented in a superconducting quantum device to determine electronic states in two example systems, the H2 molecule and the topological Bernevig-Hughes-Zhang (BHZ) model. For H2, a short internuclear distance is chosen as a starting point, at which the ground and excited states are obtained via the digitized STA. From this starting point, a sequence of internuclear distances is built. The eigenstates at each distance are sequentially determined from those at the previous distance via the digitized adiabaticity, leading to the potential energy landscapes of H2. The same approach is applied to the BHZ model, and the valence and conduction bands are excellently obtained along the X-{\Gamma}-X linecut of the first Brillouin zone. Furthermore, a numerical simulation of this method is performed to successfully extract the ground states of hydrogen chains with the lengths of 3 to 6 atoms.

Published
2021
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3. A simultaneous feedback and feed-forward control and its application to realize a random walk on the Bloch sphere in a superconducting Xmon-qubit system

Author

Xiang, Liang, Zong, Zhiwen, Sun, Zhenhai, Zhan, Ze, Fei, Ying, Dong, Zhangjingzi, Run, Chongxin, Jia, Zhilong, Duan, Peng, Wu, Jianlan, Yin, Yi, and Guo, Guoping

Subjects
Quantum Physics, Condensed Matter - Superconductivity
Abstract

Measurement-based feedback control is central in quantum computing and precise quantum control. Here we realize a fast and flexible field-programmable-gate-array-based feedback control in a superconducting Xmon qubit system. The latency of room-temperature electronics is custom optimized to be as short as 140 ns. Projective measurement of a signal qubit produces a feedback tag to actuate a conditional pulse gate to the qubit. In a feed-forward process, the measurement-based feedback tag is brought to a different target qubit for a conditional control. In a two-qubit experiment, the feedback and feed-forward controls are simultaneously actuated in consecutive steps. A quantum number is then generated by the signal qubit, and a random walk of the target qubit is correspondingly triggered and realized on the Bloch sphere. Our experiment provides a conceptually simple and intuitive benchmark for the feedback control in a multi-qubit system. The feedback system can be further scaled up for more complex feedback control experiments.

Published
2019
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4. Experimental realization of a fast controlled-Z gate via a shortcut-to-adiabaticity

Author

Wang, Tenghui, Zhang, Zhenxing, Xiang, Liang, Jia, Zhilong, Duan, Peng, Zong, Zhiwen, Sun, Zhenhai, Dong, Zhangjingzi, Wu, Jianlan, Yin, Yi, and Guo, Guoping

Subjects
Quantum Physics
Abstract

For a frequency-tunable two-qubit system, a controlled-Z (CZ) gate can be realized by adiabatically driving the qubit system through an avoided level crossing between an auxiliary state and computational levels. Here, we theoretically propose a fast CZ gate using a shortcut-to-adiabaticity (STA). Experimentally, the STA CZ gate is implemented with a 52 ns control pulse for two coupled superconducting Xmon qubits. Measured fidelity of the STA CZ gate is higher than 96.0%, in both quantum process tomography and randomized benchmarking. The protocol allows a flexible design of the evolution time and control waveform. We suggest that this `fast adiabatic' CZ gate can be directly applied to other multi-qubit quantum systems., Comment: 7 pages, 4 figures

Published
2018
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6. Stochastic Simulation of Traction Load for Urban Rail Transport Based on Dynamic Train Headway

Author

Sun, Zhenhai, Liu, Hui, Fang, Jinping, Yang, Shaobing, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Liu, Baoming, editor, Liu, Zhigang, editor, Diao, Lijun, editor, and An, Min, editor

Published
2020
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7. Modeling and Simulation of Multi-Vehicle DC Traction Power Supply System Based on MATLAB/Simulink

Author

Liu, Hui, Sun, Zhenhai, Fang, Jinping, Hao, Zihui, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Liu, Baoming, editor, Liu, Zhigang, editor, Diao, Lijun, editor, and An, Min, editor

Published
2020
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29. Optimization of a Controlled- Z Gate with Data-Driven Gradient-Ascent Pulse Engineering in a Superconducting-Qubit System

Author

Zong, Zhiwen, primary, Sun, Zhenhai, additional, Dong, Zhangjingzi, additional, Run, Chongxin, additional, Xiang, Liang, additional, Zhan, Ze, additional, Wang, Qianlong, additional, Fei, Ying, additional, Wu, Yaozu, additional, Jin, Wenyan, additional, Xiao, Cong, additional, Jia, Zhilong, additional, Duan, Peng, additional, Wu, Jianlan, additional, Yin, Yi, additional, and Guo, Guoping, additional

Published
2021
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31. A Millimeter-Wave Broadband in situ Alignment and Monitor System Based on Interferometric Direction-Finding Antenna

Author

Tianming Li, Xiaoyun Zhao, Hao Li, Biao Hu, Jiang Chuntao, Haiyang Wang, Sun Zhenhai, and Xinhui Wu

Subjects
Coupling, Physics, Nuclear and High Energy Physics, Direction finding, business.industry, Physics::Optics, 020206 networking & telecommunications, 02 engineering and technology, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, Power (physics), Interferometry, Optics, 0103 physical sciences, Broadband, Extremely high frequency, 0202 electrical engineering, electronic engineering, information engineering, Physics::Accelerator Physics, Power dividers and directional couplers, Antenna (radio), business
Abstract

Based on the modified apertures coupling theory, this paper demonstrates a millimeter-wave broadband interferometric in situ alignment and monitor system. The numerically calculated results for the directional coupler have been validated by a comparison with the simulated ones, and the results show that the directional coupler can be applied in the interferometric systems. By nulling the difference of the power signals as well as the mixing signals from each coupler pair, spatial and angular alignments of a beam oblique incidence on the mirror can be performed, meanwhile, the power and the incident angle can be detected. Finally, the adjustment precision of the interferometric system completely meets the requirements and it is expected to be used in the active denial system and the high-power radar system.

Published
2018

32. Simultaneous Feedback and Feedforward Control and Its Application to Realize a Random Walk on the Bloch Sphere in an Xmon-Superconducting-Qubit System

Author

Xiang, Liang, primary, Zong, Zhiwen, additional, Sun, Zhenhai, additional, Zhan, Ze, additional, Fei, Ying, additional, Dong, Zhangjingzi, additional, Run, Chongxin, additional, Jia, Zhilong, additional, Duan, Peng, additional, Wu, Jianlan, additional, Yin, Yi, additional, and Guo, Guoping, additional

Published
2020
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34. optimized Operation and Control of Microgrid based on Multi-objective Genetic Algorithm

Author

Wang Ruiqi, Li Wensheng, Wu Shaojun, Mengchao Fu, Xu Wei, Mu Shiyou, Sun Zhenhai, Wang Chao, and An Shuhuai

Subjects
Steady state (electronics), Control theory, Computer science, 020209 energy, Harmonics, Genetic algorithm, 0202 electrical engineering, electronic engineering, information engineering, Harmonic, 02 engineering and technology, Microgrid, Voltage, Power control, Power (physics)
Abstract

The steady-state performance and power quality of microgrid is closely related to control parameters. this paper develops hierarchical control of microgrid, which consists of power control stage, voltage control stage and current control stage. This control schemes can simultaneously regulate fundamental voltage and harmonic current to improve the power qualtiy of microgrid. In order to enhance steady state control pricision, unbalance and harmonics eliminate ability of microgrid, the control paramters of hierarchical control are optimized by multi-objective genetic algorithm. The simulation results show that the optimized control algorithm can effectively optimize the microgrid operation on steady control accuracy and power quality.

Published
2018

42. RETRACTED ARTICLE: Variant Interleukin-1 Receptor-Associated Kinase-2 Mediates Increased NF-κB and p38 Activity Induced by Lipopolysaccharide

Author

Wu Huiyun, Sun Zhenhai, Zhao Siqing, Huang Shuhai, Xu Xiegu, Huang Zhisong, Xiong Shanshan, Li Xin, and Wang Hua

Subjects
medicine.medical_specialty, business.industry, Immunology, Pharmacology toxicology, NF-κB, chemistry.chemical_compound, chemistry, Beijing, Family medicine, medicine, Immunology and Allergy, business, China, Interleukin 1 receptor associated kinase
Abstract

1 Department of Science and Technology, Academy of Military Medical Sciences, No. 20 East Street of Fengtai District, Beijing, People’s Republic of China 2 Beijing Institute of Radiation Medicine, Academy of Military Medical Sciences, No. 27 North Taiping Road of Haidian District, Beijing, People’s Republic of China 3 To whom correspondence should be addressed at Department of Science and Technology, Academy of Military Medical Sciences, No. 20 East Street of Fengtai District, Beijing, People’s Republic of China. E-mail: sunzhenh@tom.com; E-mail: xu_fortune@163.com

Published
2014

47. Analysis of Beam Propagation Through a Relay Mirror System in Turbulent Atmosphere

Author

吴慧云 Wu Huiyun, 孙振海 Sun Zhenhai, and 陈金宝 Chen Jinbao

Subjects
Turbulent atmosphere, Physics, Optics, business.industry, Relay, law, Electrical and Electronic Engineering, business, Atomic and Molecular Physics, and Optics, Beam (structure), Electronic, Optical and Magnetic Materials, law.invention
Published
2013

50. Concentration and flux of bioaerosol and environmental factors.

Author

Chen Mingxia, Jin Longshan, Sun Zhenhai, Lu Jianchun, Wang Qing'an, Hu Qingxuan, Sun Runqiao, and Li Zongkai

Subjects
*AEROSOLS, *WATER vapor transport, *SOLAR radiation
Abstract

Analyzes the concentration and flux transportation of bioaerosol in Nanjign, China. Cycle of the solar radiation and atmospheric turbulent intensity; Factors affecting the bioaerosol concentration; Use of Bowen ration method.

Published
2001

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