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Blue-detuned optical atom trapping in a compact plasmonic structure

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Photonics Research 2017年第5期5卷 436-440页

作者： ZHAO CHEN FAN zhang QI zhang JUANJUAN REN HE HAO XUEKE DUAN PENGFEI zhang tiancai zhang YING GU QIHUANG GONG State Key Laboratory for Mesoscopic Physics Collaborative Innovation Center of Quantum Matter Department of PhysicsPeking University Collaborative Innovation Center of Extreme Optics Shanxi University State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University

We theoretically propose blue-detuned optical trapping for neutral atoms via strong near-field interfacing in a plasmonic nanohole array. The optical field at resonance forms a nanoscale-trap potential with an FWHM of 200 nm and about ～370 nm away from the nanohole; thus, a stable 3 D atom trapping independent of the surface potential is demonstrated. The effective trap depth is more than 1 m K when the optical power of trapping light is only about 0.5 m W, while the atom scattering rate is merely about 3.31 s^(-1), and the trap lifetime is about 800 *** compact plasmonic structure provides high uniformity of trap depths and a two-layer array of atom nanotraps, which should have important applications in the manipulation of cold atoms and collective resonance fluorescence.

关键词： Blue-detuned optical atom trapping in a compact plasmonic structure

Friction reactions induced by selective hydrogenation of textured surface under lubricant conditions

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Friction 2024年第1期12卷 174-184页

作者： Naizhou DU Xubing WEI Xiaowei LI Zan CHEN Shiqi LU Jiaqing DING Cunao FENG Kai CHEN Jianghao QIAO Dekun zhang Kwang-Ryeol LEE tiancai zhang School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China Computational Science Center Korea Institute of Science and TechnologySeoul 136-791Republic of Korea Technology Development Department Shipbuilding Technology Research InstituteShanghai 200032China

The passivation of hydrogen atoms and the conformation of textured surfaces under oil-lubricated conditions are effective strategies to obtain amorphous carbon(a-C)films with extremely low *** is critical to understanding the influence mechanism of selective surface hydrogenation on the tribological behaviors of textured a-C film under oil-lubricated *** particular,the interactions of hydrogen atoms and lubricants are confusing,which is enslaved to the in situ characterization *** reactive molecular dynamics(RMD)simulations were conducted to analyze the friction response of textured a-C films with selective hydrogenation surfaces under oil-lubricated *** results indicate that the existence of hydrogen atoms on specific bump sites significantly decreases the friction coefficient(μ)of textured a-C film,which is highly dependent on the surface hydrogen *** repulsion between hydrogen atoms and lubricant molecules prompts the formation of a dense lubricant film on the surface of the mating ***,with the enhancement of the surface hydrogen content,the passivation of the friction interface and the repulsion between hydrogen atoms and lubricants play dominant roles in reducing the friction coefficient instead of hydrodynamic lubrication.

关键词： textured amorphous carbon(a-C) selective hydrogenation oil lubrication friction mechanism reactive molecular dynamics(RMD)

Entanglement of remote material qubits through nonexciting interaction with single photons

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Entanglement of remote material qubits through nonexciting i...

第十八届全国量子光学学术会议

作者：李刚 Pengfei zhang tiancai zhang 山西大学 State Key Laboratory of Quantum Optics and Quantum Optics Devices and Institute of Opto-ElectronicsShanxi University Collaborative Innovation Center of Extreme Optics Shanxi University

We propose a scheme to entangle multiple material qubits through interaction with single photons via nonexciting processes associated with strongly coupling systems. The basic idea is based on the material state dependent reflection and transmission for the input photons. Thus, the material qubits in several systems can be entangled when one photon interacts with each system in cascade and the photon paths are mixed by the photon detection. The character of nonexciting of material qubits does not change the state of the material qubit and thus ensures the possibility of purifying entangled states by using more photons under realistic imperfect parameters. It also guarantees directly scaling up the scheme to entangle more qubits. Detailed analysis of fidelity and success probability of the scheme in the frame of an optical Fabry-Pérot cavity based strongly coupling system is presented. It is shown that a two-qubit entangled state with fidelity above 0.99 is promised with only two photons by using currently feasible experimental parameters. Our scheme can also be directly implemented on other strongly coupled system.

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Myocardial infarction secondary prevention study (MISPS)

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Journal of Geriatric Cardiology 2006年第2期3卷 116-119页

作者： Hongcai SHANG Guohua DAI Junhua HANG Yaozu XIANG Yang WANG Junping zhang Wuxun DU Jingyuan MAO Chen YAO Weiliang WENG tiancai WEN Boli zhang Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China First Hospital of Peking University Beijing 100700 China Chinese Academy of Traditonal Chinese Medicine Beijing 100700 China Chinese Academy of Traditonal Chinese Medicine Beijing 100700 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China

Background Traditional Chinese medicine (TCM), especially herbal medicine, has been widely used in China and now is also being increasingly used in other countries for the treatment of cardiovascular diseases. Although many studies have demonstrated that certain Chinese herbal products are effective and safe for the treatment of cardiovascular diseases, most of these lack sufficient quality. Therefore, large randomized clinical trials and further scientific research to determine its safety, effectiveness are *** YiQi Dripping Pills (QSYQDP) is a herbal preparation clinically used in the treatment and prevention of coronary artery disease. Preliminary observations have shown its safety and effectiveness. Methods/Design This randomized, controlled trial will recruit 3600 patients with a history of myocardial infarction. Patients will be randomized into two groups by a Centr-Randomized System. One group receives QSYQDP, the other group receive aspirin. This trial protocol will describe eligibility criteria, detailed information on the treatment definition, blinding, endpoints, statistical methods, sample size determination, data management, legal aspects, and the current status of the trial. Discussion This trial is one of the first randomized, controlled clinical trial to evaluate the efficacy and safety of traditional Chinese herbal medicine in the treatment and secondary prevention of coronary artery disease. The results of this study should help to define the role of TCM in modern medical care, as well as to provide the management strategy for CAD patients in China and other countries.

关键词： Myocardial infarction secondary prevention study MISPS MACE

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基于微米空心波导的单粒子高效探测

光学学报 2020年第3期40卷 177-182页

作者：张鹏飞李刚张天才山西大学光电研究所量子光学与光量子器件国家重点实验室山西太原030006 山西大学极端光学省部共建协同创新中心山西太原030006

提出一种用于高效率收集单粒子荧光的锥形空心波导探针。在理论上采用数值模拟得到了锥形空心波导探针对单粒子荧光的收集效率。通过优化探针几何尺寸可得,单粒子为径向偏振时探针对单粒子荧光的收集效率最高为25.3%,普遍高于利用高数... 详细信息

提出一种用于高效率收集单粒子荧光的锥形空心波导探针。在理论上采用数值模拟得到了锥形空心波导探针对单粒子荧光的收集效率。通过优化探针几何尺寸可得,单粒子为径向偏振时探针对单粒子荧光的收集效率最高为25.3%,普遍高于利用高数值孔径透镜的传统方法。综合发光粒子不同方向的偏振后可知,探针的平均收集效率可达21.7%,最优工作距离为0.75μm。此外,探针对单个粒子荧光的收集效率和工作距离对于粒子发射光的波长不敏感,故此探针可以用于对具有不同波长的各类粒子和宽谱发光粒子的高效率探测。此探针直径为微米量级,易于与其他微纳结构结合。此探针可用于单原子、单分子、量子点、金刚石色心等粒子的高效率探测,并有望进一步用于化学、生物微小发光体等的探测。

关键词：量子光学单粒子探测空心波导光与原子相互作用

Characteristics and Controls of Fiber Ring Resonator With a Nanofiber Section

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Characteristics and Controls of Fiber Ring Resonator With a ...

第十八届全国量子光学学术会议

作者：宋丽军 Pengfei zhang Xin Wang Gang Li tiancai zhang 山西大学 State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi University Collaborative Innovation Center of Extreme Optics Shanxi University

We experimentally demonstrate a fiber ring resonator with a nanofiber section for cavity quantum electrodynamics. A commercial tunable fiber beam splitter provides simple and robust coupling to the resonator. We can realize the under-coupling, the critical coupling and the over-coupling of the nanofiber-based ring resonator by changing the splitting ratio of the tunable fiber splitter. Minimum transmittance of this resonator as a function of total loss（K0） is measured and is good in agreement with theoretical fitting,as show in Fig.2. In the experiment, we can tune the resonance of the ring resonator by controlling the length of a part of fiber in the resonator by stretching the fiber using a piezo. Pound-Drever-Hall（PDH） method is used to lock the length of the resonator precisely, as show in Fig.1. The nanofiber-based ring resonator can achieve strong-coupling interaction with cold atoms or NV center in diamond due to its strong evanescent field on the surface of the nanofiber. It is expected to be applied in the fields of cavity quantum electrodynamics and precision measurements.

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Characterizing optical dipole trap via fluorescence of trapped cesium atoms

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Science China(Physics,Mechanics & Astronomy) 2006年第3期49卷 273-280页

作者： LIU Tao, GENG Tao, YAN Shubin, LI Gang, zhang Jing, WANG Junmin, PENG Kunchi & zhang tiancai State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China State Key Laboratory of Quantum Optics Quantum Optics Devices Institute of Opto-Electronics Shanxi University Taiyuan 030006 China

Optical dipole trap (ODT) is becoming an important tool of manipulating neu- tral atoms. In this paper ODT is realized with a far-off resonant laser beam strongly fo- cused in the magneto-optical trap (MOT) of cesium atoms. The light shift is measured by simply monitoring the fluorescence of the atoms in the magneto-optical trap and the opti- cal dipole trap simultaneously. The advantages of our experimental scheme are discussed, and the effect of the beam waist and power on the potential of dipole trap as well as heating rate is analyzed.

关键词： magneto-optical trap optical dipole trap cold atom light shift.

Measurement of complete and continuous Wigner functions for discrete systems using a single atom

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Measurement of complete and continuous Wigner functions for ...

第十八届全国量子光学学术会议

作者：田亚莉 Wei Wo Pengfei zhang Gang Li Jie Li tiancai zhang 山西大学 State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronicsand Collaborative Innovation Center of Extreme OpticsShanxi University

The Wigner function（WF） [1], originally introduced as a quantum analog of the classical phase-space distribution function, provides a powerful tool to represent quantum mechanics in phase space [2], alternative to the density-matrix representation. It is a quasiprobability distribution in that it acts like a probability distribution but can take negative values for some quantum states. Although WFs have been successfully measured for continuous variable quantum systems in the past two decades, measurement of complete and continuous WFs for discrete quantum systems has been a subject of investigation for more than half a century. The main obstacle comes from the theoretical difficulties of defining a complete and continuous WF for discrete systems that satisfies all the requirements of the Stratonovich-Weyl correspondence. Adopting the WF strictly defined in Ref. [3], in this talk we will present the first measurement of complete and continuous WFs of a well controlled truly single two-level cesium atom. In our experiment a single cesium atom is controlled deterministically in a micro-sized dipole trap and undergoes a nearly pure dephasing process. We find that for an arbitrary pure state of a qubit its WF has always negative regions and the negativity vanishes if the purity of an arbitrary mixed state is less than 2/3. We experimentally demonstrate these findings using our system of trapped single atoms [4]. This provides a more intuitive phase-space approach to study the fundamental processes of decoherence dynamics in quantum discrete systems.

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State-insensitive cooling and trapping of single atoms in an optical cavity

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State-insensitive cooling and trapping of single atoms in an...

第十六届全国量子光学学术报告会

作者： Wenfang Li Jinjin Du Ruijuan Wen Pengfei Yang Gang Li tiancai zhang State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi University

＜正＞Cavity quantum electrodynamics（QED）provides powerful possibilities for the deterministic control of atom-photon interactions on the single quanta *** primary technical challenge on the road toward this scientific goal is to trap and localize individual atoms within a cavity with long trapping time for strong coupling between atom

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