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Photoionisation detection of a single Er3+ ion with sub-100-ns time resolution

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National Science Review 2024年第4期11卷 38-45页

作者： Yangbo Zhang Wenda Fan Jiliang Yang Hao Guan Qi Zhang Xi Qin Changkui duan Gabriele G.de Boo Brett C.Johnson Jeffrey C.Mc Callum Matthew J.Sellars Sven Rogge Chunming Yin jiangfeng du CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei National Laboratory University of Science and Technology of China Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of New South Wales Centre of Excellence for Quantum Computation and Communication Technology School of Engineering RMIT University Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of Melbourne Centre of Excellence for Quantum Computation and Communication Technology Research School of Physics and Engineering Australian National University

Efficient detection of single optical centres in solids is essential for quantum information processing, sensing and single-photon generation *** this work,we use radio-frequency（RF） reflectometry to electrically detect the photoionisation induced by a single Er3+ion in *** high bandwidth and sensitivity of the RF reflectometry provide sub-100-ns time resolution for the photoionisation *** this technique,the optically excited state lifetime of a single Er3+ion in a Si nano-transistor is measured for the first time to be 0.49±0.04μ*** results demonstrate an efficient approach for detecting a charge state change induced by Er excitation and *** approach could be used for fast readout of other single optical centres in solids and is attractive for large-scale integrated optical quantum systems thanks to the multi-channel RF reflectometry demonstrated with frequency multiplexing techniques.

关键词： single optical centres erbium ions RF reflectometry photoionisation detection

“国优计划”:探索拔尖创新人才自主培养的新路径

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中国高教研究 2024年第6期 6-9页

作者：杜江峰中国科学院浙江大学浙江杭州310058

在推进高水平科技自立自强的新时期,拔尖创新人才自主培养对教师教育体系提出了新要求。“国优计划”以推动高水平大学培养研究生层次科学教师来夯实拔尖创新人才培养之基,体现出填补科学教师教育的政策缺位,优化教师教育政策的结构体系... 详细信息

在推进高水平科技自立自强的新时期,拔尖创新人才自主培养对教师教育体系提出了新要求。“国优计划”以推动高水平大学培养研究生层次科学教师来夯实拔尖创新人才培养之基,体现出填补科学教师教育的政策缺位,优化教师教育政策的结构体系;突破传统师范类教育体系的路径依赖,推动高水平大学与中小学联动共建高质量科学教师队伍;直面基础教育科学教师队伍结构性矛盾,发挥中国特色、世界一流大学的理工科人才培养优势等政策理性。浙江大学立足于“综合型、研究型、创新型”的办学传统优势,从面、线、点三个层面发力打造一流的卓越科学教师培养基地,探索“理学/工学+教育学”的培养方案,实行“项目制组织、全方位训练、全链条协同”的卓越科学教师自主培养新模式。

关键词：国优计划卓越科学教师拔尖创新人才科技自立自强

Direct characteristic-function tomography of the quantum states of quantum fields

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中国科学:物理学、力学、天文学英文版 2023年第11期66卷 119-125页

作者： Zehua Tian Jiliang Jing jiangfeng du CAS Key Laboratory of Microscale Magnetic Resonance School of Physical SciencesUniversity of Science and Technology of ChinaHefei230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei230026China Department of Physics Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Educationand Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha410081China Hefei National Laboratory University of Science and Technology of ChinaHefei230088China School of Physics Zhejiang UniversityHangzhou310027China

Herein,we propose a novel strategy for implementing a direct readout of the symmetric characteristic function of the quantum states of quantum fields without the involvement of idealized measurements,an aspect that has always been deemed ill-defined in quantum field *** proposed scheme relies on the quantum control and measurements of an auxiliary qubit locally coupled to the quantum *** mapping the expectation values of both the real and imaginary parts of the field displacement operator to the qubit states,the qubit's readout provides complete information regarding the symmetric characteristic *** characterize our technique by applying it to the Kubo-Martin-Schwinger(thermal)and squeezed states of a quantum scalar *** addition,we have discussed general applications of this approach to analogue-gravity systems,such as Bose-Einstein condensates,within the scope of state-of-the-art experimental *** proposed strategy may serve as an essential in understanding and optimizing the control of quantum fields for relativistic quantum information applications,particularly in exploring the interplay between gravity and quantum,for example,the relation to locality,causality,and information.

关键词： characteristic-function tomography quantum fields Ramsey interferometry analogue gravity

靶向DNA损伤应答关键分子在肿瘤放疗增敏中的应用

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中华放射医学与防护杂志 2024年第4期44卷 323-329页

作者：何远芳刘瑞雪闫海丽杜江锋山西医科大学药学院晋中030619 山西医科大学第一医院医学影像科太原030001

放射治疗是临床肿瘤治疗的重要手段,主要通过破坏DNA双链对肿瘤细胞造成严重损伤。然而,其作为单一的治疗手段,治疗效果受肿瘤细胞固有DNA损伤修复能力的影响。多项研究表明,靶向调节DNA损伤响应关键分子可以有效抑制DNA损伤修复,协同... 详细信息

放射治疗是临床肿瘤治疗的重要手段,主要通过破坏DNA双链对肿瘤细胞造成严重损伤。然而,其作为单一的治疗手段,治疗效果受肿瘤细胞固有DNA损伤修复能力的影响。多项研究表明,靶向调节DNA损伤响应关键分子可以有效抑制DNA损伤修复,协同增强放化疗敏感性。本文对一些关键的DNA损伤响应抑制剂联合放疗、化疗在多种肿瘤治疗中的应用进行了总结,并阐述了联合治疗诱导由环鸟嘌呤核苷酸腺嘌呤核苷酸合成酶-干扰素基因刺激因子介导的免疫反应。最后总结和展望了联合治疗存在的挑战和发展前景。

关键词：放疗 DNA损伤修复靶向放疗增敏免疫反应

Functional tumor imaging based on inorganic nanomaterials

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Science China Chemistry 2017年第11期60卷 1425-1438页

作者： jiangfeng du Xiao Zhang Liang Yan Rui Chen School of Radiation Medicine and Protection & School for Radiological and Interdisciplinary Sciences (RAD-X) Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions Soochow University CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Institute of High Energy Physics Chinese Academy of Sciences CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology of China College of Materials Sciences and Opto-Electronic Technology University of Chinese Academy of Sciences

Inorganic nanomaterials have attracted substantial research interest due to their unique intrinsic physicochemical properties. We highlighted recent advances in the applications of inorganic nanoparticles regarding their imaging efficacy, focusing on tumor-imaging nanomaterials such as metal-based and carbon-based nanomaterials and quantum dots. Inorganic nanoparticles gain excellent in vivo tumor-imaging functions based on their specific characteristics of strong near-infrared optical absorption and/or X-ray attenuation capability. The specific response signals from these novel nanornaterials can be captured using a series of imaging techniques, i.e., optical coherence tomography （OCT）, X-ray computed tomography （CT） imaging, two-photon luminescence （TPL）, photoacoustic tomography （PAT）, magnetic resonance imaging （MRI）, surface-enhanced Raman scattering （SERS） and positron emission tomography （PET）. In this review, we summarized the rapid development of inorganic nanomaterial applications using these analysis techniques and discussed the related safety issues of these materials.

关键词： imaging gold nanoparticles carbon nanotube graphene quantum dots toxicity

Detection of radio-frequency field with a single spin in diamond

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Science Bulletin 2016年第14期61卷 1132-1137页

作者： Ying Liu Fei Kong Fazhan Shi jiangfeng du Hefei National Laboratory for Physical Sciences at the Microscale Department of Modern Physics University of Science and Technology of China

Detection of a.c. magnetic field is consequential for many developments in physical and biological sciences,and various designs of magnetometer have been proposed recently. However, the large size of sensor and the extreme measurement conditions required strongly limit their application. It remains a challenge to reconstruct the vector of a.c. field with nanoscale spatial resolution using a single spin under ambient conditions. In this work, we choose the radio-frequency(RF) field as a typical case and realize the measurement of RF field based on a nitrogen-vacancy(NV)center in diamond. We build a solid sensor through measuring the effect of RF field on NV electron spin energy levels and the transition between them. Both of the phase and amplitude(including the transverse and longitudinal components) are measured by this new approach.

关键词： Magnetometer - Nitrogen-vacancy center Quantum metrology Radio-frequency field

3D structural modeling integrated with seismic attribute and petrophysical evaluation for hydrocarbon prospecting at the Dhulian Oilfield,Pakistan

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Frontiers of Earth Science 2021年第3期15卷 649-675页

作者： Umair KHAN Baoyi ZHANG jiangfeng du Zhengwen JIANG MOE Key Laboratory of Metallogenic Prediction of Nonferrous Metals&Geological Environment Monitoring/School of Geosciences&Info-Physics Central South UniversityChangsha 410083China CNOOC Research Institute Co.Ltd. Beijing 10028China

Surface and deep subsurface geological structural trends,stratigraphic features,and reservoir characteristics play important roles in assessment of hydrocarbon ***,an approach that integrates digital elevation modelling,seismic interpretation,seismic attributes,three-dimensional(3D)geological structural modeling predicated on seismic data interpretation,and petrophysical analysis is presented to visualize and analyze reservoir structural trends and determine residual hydrocarbon *** digital elevation model is utilized to provide verifiable predictions of the Dhulian surface *** interpretation of synthetic seismograms use two-way time and depth contour models to perform a representative 3D reservoir geological structure *** on Petrel structural modeling efficiency,reservoir development indexes,such as the true 3D structural trends,slope,geometry type,depth,and possibility of hydrocarbon prospects,were calculated for the Eocene limestone Chorgali,upper Paleocene limestone Lockhart,early Permian arkosic sandstone Warcha,and Precambrian Salt Range *** envelope,instantaneous frequency,and average energy attribute analyses were utilized to resolve the spatial predictions of the subsurface structure,formation extrusion,and reflector *** evaluated the average porosity,permeability,net to gross ratio,water saturation,and hydrocarbon saturation of early Eocene limestone and upper Paleocene limestone based on the qualitative interpretation of well log *** summary,this integrated study validates 3D stratigraphic structural trends and fault networks,facilitates the residual hydrocarbon potential estimates,and reveals that the Dhulian area has a NE to SW(fold axis)thrust-bounded salt cored anticline structure,which substantiates the presence of tectonic *** thrust faults have fold axes trending from ENE to WSW,and the petrophysical analysis shows that the mapped reservoir is of good quality and

关键词： surface model seismic interpretation subsurface structural model attributes hydrocarbon potential

Physics of quantum coherence in spin systems

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Chinese Physics B 2019年第2期28卷 5-24页

作者： Maimaitiyiming Tusun Xing Rong jiangfeng du CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics University of Science and Technology of China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China School of Physics and Electronic Engineering Xinjiang Normal University

Quantum computation provides a great speedup over its classical counterpart in solving some hard problems. The advantages of quantum computation come from the coherent superposition principle of quantum mechanics. Spin system is one of the most significant candidates to realize quantum computation. In this review, we focus on the recent experimental progress related to quantum coherence and some fundamental concepts such as the uncertainty principle in the spin *** shall first briefly introduce the quantum description of qubit, coherence, and decoherence. Based on this picture,preserving quantum coherence and detection of weak magnetic fields are presented. We also discuss the realization of precise quantum coherent control, adiabatic quantum factorization algorithm, and two aspects of uncertainty relations.

关键词： coherence decoherence magnetic resonance techniques uncertainty relation

Generic preparation and entanglement detection of equal superposition states

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Science China(Physics,Mechanics & Astronomy) 2017年第7期60卷 32-39页

作者： Qi Yu YanBao Zhang Jun Li HengYan Wang XinHua Peng jiangfeng du Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Hefei 230026 China Institute for Quantum Computing and Department of Physics and Astronomy University of Waterloo Waterloo N2L 3G1 Canada Beijing Computational Science Research Center Beijing 100084 China Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei 230026 China College of Physics and Electronic Science Hubei Normal University Huangshi 435002 China

Quantum superposition is a fundamental principle of quantum mechanics, so it is not surprising that equal superposition states(ESS) serve as powerful resources for quantum information processing. In this work, we propose a quantum circuit that creates an arbitrary dimensional ESS. The circuit construction is efficient as the number of required elementary gates scales polynomially with the number of required qubits. For experimental realization of the method, we use techniques of nuclear magnetic resonance(NMR). We have succeeded in preparing a 9-dimensional ESS on a 4-qubit NMR quantum register. The full tomography indicates that the fidelity of our prepared state with respect to the ideal 9-dimensional ESS is over 96%. We also prove the prepared state is pseudo-entangled by directly measuring an entanglement witness operator. Our result can be useful for the implementation of those quantum algorithms that require an ESS as an input state.

关键词： equal superposition states nuclear magnetic resonance quantum algorithms quantum entanglement