检索结果-南通市图书馆

Optomechanical interfaces for hybrid quantum networks

在线全文

学校读者我要写书评

暂无评论

National Science Review 2015年第4期2卷 510-519页

作者： chunhua dong Yingdan Wang Hailin Wang Key Laboratory of Quantum Information Chinese Academy of Sciences University of Science and Technology of China State Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences Department of Physics and Oregon Center for Optics University of Oregon

Recent advances on optical control of mechanical motion in an optomechanical resonator have stimulated strong interests in exploring quantum behaviors of otherwise classical, macroscopic mechanical systems and especially in exploiting mechanical degrees of freedom for applications in quantum information *** an optomechanical resonator, an optically- active mechanical mode can couple to any of the optical resonances supported by the resonator via radiation pressure. his unique property leads to a remarkable phenomenon: mechanically-mediated conversion of optical ields between vastly diferent wavelengths. he resulting optomechanical interfaces can play a special role in a hybrid quantum network, enabling quantum communication between disparate quantum systems. In this review, we introduce the basic concepts of optomechanical interactions and discuss recent theoretical and experimental progresses in this ield. A particular emphasis is on taking advantage of mechanical degrees of freedom, while avoiding detrimental efects of thermal mechanical motion.

关键词： cavity optomechanics radiation pressure quantum networks quantum optics quantum state transfer

Interconversion of photon-phonon in a silica optomechanical microresonator

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2015年第5期58卷 64-69页

作者： dong chunhua SHEN Zhen ZOU ChangLing GUO GuangCan Key Laboratory of Quantum Information Chinese Academy of Sciences University of Science and Technology of China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China

In an optomechanical resonator, the optical and mechanical excitations can be coherently converted, which induces a transparency window for a weak probe laser beam. Here, we report an experimental study of transient optomechanically induced transparency(OMIT) using the silica microsphere with the breathing modes. The transient OMIT behavior obtained are in good agreement with theoretical calculations. In addition, the coherent interconversion between optical and mechanical excitations that can be used for light storage and readout has also been studied here. Our experimental results indicate that the light storage is closely related to the process of OMIT, and the photon-phonon conversion can be further applied to optical wavelength or optical mode conversion.

关键词： cavity optomechanics optomechanically induced transparency microsphere

High-Q whispering gallery modes in a polymer microresonator with broad strain tuning

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2015年第11期58卷 45-49页

作者： ZHOU ZhongHao SHU FangJie SHEN Zhen dong chunhua GUO GuangCan Key Laboratory of Quantum Information Chinese Academy of Sciences 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 Electrical Information Shangqiu Normal University

We have reported the high-Q whispering gallery modes(WGMs) in a polydimethylsiloxane(PDMS) optical microresonators with broad tuning range. The PDMS microresonators are fabricated at the center of two collimating fiber tips, which can be controlled by the piezoelectric stage. Through stretching the fiber stem, the tuning range of WGMs are demonstrated more than 50 *** investigations demonstrated that the WGM shift has a high force sensitivity(～ 19.7 pm/μN) of the gravitation when the microcavity is stretched by a weight. The theoretical analysis reveals that the high force sensitivity of polymer microresonator can be used for the weak force or height measurement.

关键词： microresonator polymer broadband tuning

Subdiffraction optical manipulation of the charge state of nitrogen vacancy center in diamond

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2015年第1期4卷 554-561页

作者： Xiangdong Chen Changling Zou Zhaojun Gong chunhua dong Guangcan Guo Fangwen Sun Key Lab of Quantum Information University of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

As a potential candidate for quantum computation and metrology,the nitrogen vacancy(NV)center in diamond presents both challenges and opportunities resulting from charge-state *** utilizing different lasers for the photon-induced charge-state conversion,we achieved subdiffraction charge-state *** charge-state depletion(CSD)microscopy resolution was improved to 4.1 nm by optimizing the laser pulse ***,the electron spin-state dynamics of adjacent NV centers were selectively detected via the *** experimental results demonstrated that the CSD can improve the spatial resolution of the measurement of NV centers for nanoscale sensing and quantum information.

关键词： charge state NV center photon ionization super-resolution microscopy

A mechanically tuned Kerr comb in a dispersion-engineered silica microbubble resonator

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2020年第5期63卷 92-97页

作者： FangJie Shu PeiJi Zhang YanJun Qian ZhengYu Wang Shuai Wan Chang Ling Zou GuangCan Guo chunhua dong Department of Physics Shangqiu Normal Universiy Shangqius 476000.China FCAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

This paper discusses the developement and investigation of a silica microbubble resonator(MBR) that is optimized to cancel mode dispersion with material dispersion, at a wavelength of approximately 1550 nm and maintain a quality factor of an optical mode as large as 5.4 × 10~7. Benefitting from the near-zero dispersion and high quality factor, a primary optical comb is generated in the MBR using cascaded four-wave mixing processes, which span over 300 nm with several tens of teeth. Furthermore, the frequency comb could be gradually tuned by mechanically stretching the MBR. This tunable Kerr comb has multiple potential applications in precision measurements and sensing applications, such as molecular spectroscopy and ranging.

关键词： microresonator nonlinear optics frequency comb

Soliton microcomb-assisted microring photonic thermometer with ultra-high resolution and broad range

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2023年第10期11卷 I0001-I0010页

作者： CHENG ZHANG JIN WANG GUOGUO KANG JIANXIN GAO ZHIER QU SHUAI WAN chunhua dong YIJIE PAN JIFENG QU Center for Advanced Measurement Science National Institute of MetrologyBeijing 100029China School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

Whispering gallery mode resonators(WGMRs)have proven their advantages in terms of sensitivity and precision in various sensing ***,when high precision is pursued,the WGMR demands a high-quality factor usually at the cost of its free spectral range(FSR)and corresponding measurement *** this article,we propose a high-resolution and wide-range temperature sensor based on chip-scale WGMRs,which utilizes a Si_(3)N_(4)ring resonator as the sensing element and a Mg F_(2)-based microcomb as a broadband frequency *** measuring the beatnote signal of the WGM and microcomb,the ultra-high resolution of 58 micro-Kelvin(μK)was *** ensure high resolution and broad range simultaneously,we propose an ambiguity-resolving method based on the gradient of feedback voltage and combine it with a frequency-locking *** a proof-of-concept experiment,a wide measurement range of 45 K was *** soliton comb-assisted temperature measurement method offers high-resolution and wide-range capabilities,with promising advancements in various sensing applications.

关键词： resonator resolution high

在线全文

学校读者我要写书评

暂无评论

论产品责任法中的符合强制性标准抗辩

重庆大学学报（社会科学版） 2015年第4期21卷 141-147页

作者：董春华华东政法大学科学研究院上海200042

强制性标准是生产者生产产品必须遵循的标准。符合强制性标准抗辩是指产品符合强制性标准导致伤害时,生产者可减轻或免除赔偿责任。强制性标准与侵权诉讼标准各有千秋,而中国法院对强制性标准的盲目崇拜,使其赋予符合强制性标准抗辩较... 详细信息

强制性标准是生产者生产产品必须遵循的标准。符合强制性标准抗辩是指产品符合强制性标准导致伤害时,生产者可减轻或免除赔偿责任。强制性标准与侵权诉讼标准各有千秋,而中国法院对强制性标准的盲目崇拜,使其赋予符合强制性标准抗辩较高的证据效力。法院对强制性标准的尊重实质上是对立法和司法权力的尊重,但这会导致产品符合强制性标准又致害时,受害人无法获得救济。中国法院应适当降低符合强制性标准抗辩的地位,使其既能维护受害人的权益又能鼓励生产者研发新产品。

关键词：产品责任法符合强制性标准抗辩定位

在线全文

学校读者我要写书评

暂无评论

输血致害责任举证规则实证研究

法学论坛 2015年第5期30卷 116-125页

作者：董春华华东政法大学科学研究院上海201620

《侵权责任法》第54、58条关于医疗侵权责任举证规则的规定,未涉及推定因果关系,将推定过错限制于三类情形,弱化了《证据规定》开始采纳的举证责任倒置规则的影响。基于对输血致害责任领域140个典型案例样本的分析,发现《侵权责任法》... 详细信息

《侵权责任法》第54、58条关于医疗侵权责任举证规则的规定,未涉及推定因果关系,将推定过错限制于三类情形,弱化了《证据规定》开始采纳的举证责任倒置规则的影响。基于对输血致害责任领域140个典型案例样本的分析,发现《侵权责任法》弱化举证责任倒置规则的举措未对输血致害责任司法实践产生实质性影响。这与立法条文本身设置、未充分考虑司法实践意见及规范性文件效力位阶混乱有关,与采血输血的专业性及致害的严重性也不无关联。未来法律解释应充分考虑输血致害的特性及司法实践对举证责任倒置的态度,以更好地平衡患者与医疗机构之间的利益。

关键词：输血致害责任举证规则举证责任倒置

在线全文

学校读者我要写书评

暂无评论

论单独侵权致同一损害适用按份责任的例外

法商研究 2022年第1期39卷 187-200页

作者：董春华华东政法大学知识产权学院

单独侵权不足以致全部损害时,应适用连带责任还是按份责任并无定论。连带责任将部分侵权人不能清偿的风险转嫁给其他侵权人,有利于保护受害人,却让过错比例较小的侵权人承担过重的责任;按份责任可避免过错程度与责任不相称,却将部分侵... 详细信息

单独侵权不足以致全部损害时,应适用连带责任还是按份责任并无定论。连带责任将部分侵权人不能清偿的风险转嫁给其他侵权人,有利于保护受害人,却让过错比例较小的侵权人承担过重的责任;按份责任可避免过错程度与责任不相称,却将部分侵权人不能清偿的风险转移给原告。这使连带责任或按份责任作为一般规则设置例外显得必要,由此形成两种模式:连带责任为一般规则、按份责任为例外与按份责任为一般规则、连带责任为例外。多数国家采纳前者,我国采纳后者。排除政策性连带责任,网络服务提供者承担连带责任属于我国"按份责任"一般规则的例外,但其适当性欠妥,司法实践将环境侵权、医疗侵权作为例外情形有其合理性。

关键词：单独侵权同一损害连带责任按份责任例外情形