We develop a design of a hybrid quantum interface for quantum information transfer （QIT）, adopting a nanome- chanical resonator as the intermedium, which is magnetically coupled with individual nitrogen-vacancy cent...We develop a design of a hybrid quantum interface for quantum information transfer （QIT）, adopting a nanome- chanical resonator as the intermedium, which is magnetically coupled with individual nitrogen-vacancy centers as the solid qubits, while eapacitively coupled with a coplanar waveguide resonator as the quantum data bus. We describe the Hamiltonian of the model, and analytically demonstrate the QIT for both the resonant interaction and large detuning cases. The hybrid quantum interface allows for QIT between arbitrarily selected individual nitrogen-vacancy centers, and has advantages of the sealability and controllability. Our methods open an alter- native perspective for implementing QIT, which is important during quantum storing or processing procedures in quantum computing.展开更多
Molecular wires with tetrathiafulvalene （TTF） as redox center were synthesized and characterized. UV-vis spectra and cyclic voltammetry showed these wires had good reversible redox behavior under ambient conditions ...Molecular wires with tetrathiafulvalene （TTF） as redox center were synthesized and characterized. UV-vis spectra and cyclic voltammetry showed these wires had good reversible redox behavior under ambient conditions and their HOMO energy levels （--5.0 eV） matched well with the Fermi level of Au （--5.1 eV）.展开更多
Early events of charge separation in reaction centers (RCs) of bacterial photosynthesis are modeled by kinetic equations with time-dependent rate constants. An illustrative case of regular motion along a “slow” coor...Early events of charge separation in reaction centers (RCs) of bacterial photosynthesis are modeled by kinetic equations with time-dependent rate constants. An illustrative case of regular motion along a “slow” coordinates leading to oscillations in the kinetics is examined. Different schemes of charge separation are investigated. A good fitting of experimental kinetics of native Rba. sphaeroides RCs is achieved in the five states model P*1BAHA↔P*2BAHA↔I↔P+HA↔P+BA with two excited states BAHA and BAHA and three charge separated states I, P+HA and P+BA (P is a primary electron donor, bacteriochlorophyll dimer, BA and HA are an electron acceptor, monomeric bacteriochlorophyll and bacteriopheophytin in active A-branch, respectively). In the model only the first excited state is directly populated by optical excitation. The emission of the two excited states is assumed to be at 905 and 940 nm, respectively. The intermediate state I is assumed to absorb at 1020 nm as well as the P+HA state. The model explains the deep oscillations in the kinetics of the stimulated emission and of the absorption. In the simpler schemes without the I state or with only one excited state the accordance with the experiment is achieved at unreal parameter values. A possible nature of the I and BAHA states and a possible incoherent nature of the oscillations are discussed.展开更多
We study the photo-oxidation of bacteriochlorophylls （BChls） in peripheral light harvesting complexes （LH2） from rhodobacter sphaeroides by using the steady absorption and the femtosecond pump-probe measurement, t...We study the photo-oxidation of bacteriochlorophylls （BChls） in peripheral light harvesting complexes （LH2） from rhodobacter sphaeroides by using the steady absorption and the femtosecond pump-probe measurement, to realize the detailed dynamics of LH2 in the presence of photo-oxidation. The experimental results reveal that BChl-B850 radical cations may act as an additional channel to compete with the unoxidized BChl-B850 molecules for rapidly releasing the excitation energy, while the B800→B850 energy transfer rate is almost unaffected in the oxidation process.展开更多
在中国经济转向创新驱动的背景下,科技成果转移转化工作为促进科技向生产力和经济发展转变发挥了关键作用。聚焦科技成果转移转化过程的“最初一公里”——概念验证(proof of concept,POC)及概念验证中心(proof of concept center,POCC...在中国经济转向创新驱动的背景下,科技成果转移转化工作为促进科技向生产力和经济发展转变发挥了关键作用。聚焦科技成果转移转化过程的“最初一公里”——概念验证(proof of concept,POC)及概念验证中心(proof of concept center,POCC)建设,通过详细回顾美国在这一领域的发展历程,特别是德什潘德中心和佐治亚理工创业实验室(VentureLab)的案例研究,揭示了POCC在支持早期科技创新和促进商业化方面成功经验及重要作用。美国POCC的运作模式和成功要素为理解如何帮助创业团队评估商业可行性提供了有价值的参考;基于对美国经验的分析,提出了一系列针对中国在POCC建设方面的策略和建议,包括发挥政府引导作用、融合多元主体和强化创新体系、发挥中国特色。这些建议旨在促进科技成果的商业化,加强大学、政府和企业之间的协同创新,从而推动科技创新不断面向国民经济主战场。展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 11305021the Fundamental Research Funds for the Central Universities of China under Grants Nos 3132014229 and 3132014328
文摘We develop a design of a hybrid quantum interface for quantum information transfer （QIT）, adopting a nanome- chanical resonator as the intermedium, which is magnetically coupled with individual nitrogen-vacancy centers as the solid qubits, while eapacitively coupled with a coplanar waveguide resonator as the quantum data bus. We describe the Hamiltonian of the model, and analytically demonstrate the QIT for both the resonant interaction and large detuning cases. The hybrid quantum interface allows for QIT between arbitrarily selected individual nitrogen-vacancy centers, and has advantages of the sealability and controllability. Our methods open an alter- native perspective for implementing QIT, which is important during quantum storing or processing procedures in quantum computing.
基金supported by National Natural Sciences Foundation of China (Nos.20402015,60771031).
文摘Molecular wires with tetrathiafulvalene （TTF） as redox center were synthesized and characterized. UV-vis spectra and cyclic voltammetry showed these wires had good reversible redox behavior under ambient conditions and their HOMO energy levels （--5.0 eV） matched well with the Fermi level of Au （--5.1 eV）.
文摘Early events of charge separation in reaction centers (RCs) of bacterial photosynthesis are modeled by kinetic equations with time-dependent rate constants. An illustrative case of regular motion along a “slow” coordinates leading to oscillations in the kinetics is examined. Different schemes of charge separation are investigated. A good fitting of experimental kinetics of native Rba. sphaeroides RCs is achieved in the five states model P*1BAHA↔P*2BAHA↔I↔P+HA↔P+BA with two excited states BAHA and BAHA and three charge separated states I, P+HA and P+BA (P is a primary electron donor, bacteriochlorophyll dimer, BA and HA are an electron acceptor, monomeric bacteriochlorophyll and bacteriopheophytin in active A-branch, respectively). In the model only the first excited state is directly populated by optical excitation. The emission of the two excited states is assumed to be at 905 and 940 nm, respectively. The intermediate state I is assumed to absorb at 1020 nm as well as the P+HA state. The model explains the deep oscillations in the kinetics of the stimulated emission and of the absorption. In the simpler schemes without the I state or with only one excited state the accordance with the experiment is achieved at unreal parameter values. A possible nature of the I and BAHA states and a possible incoherent nature of the oscillations are discussed.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10274013 and 10374020.
文摘We study the photo-oxidation of bacteriochlorophylls （BChls） in peripheral light harvesting complexes （LH2） from rhodobacter sphaeroides by using the steady absorption and the femtosecond pump-probe measurement, to realize the detailed dynamics of LH2 in the presence of photo-oxidation. The experimental results reveal that BChl-B850 radical cations may act as an additional channel to compete with the unoxidized BChl-B850 molecules for rapidly releasing the excitation energy, while the B800→B850 energy transfer rate is almost unaffected in the oxidation process.
文摘在中国经济转向创新驱动的背景下,科技成果转移转化工作为促进科技向生产力和经济发展转变发挥了关键作用。聚焦科技成果转移转化过程的“最初一公里”——概念验证(proof of concept,POC)及概念验证中心(proof of concept center,POCC)建设,通过详细回顾美国在这一领域的发展历程,特别是德什潘德中心和佐治亚理工创业实验室(VentureLab)的案例研究,揭示了POCC在支持早期科技创新和促进商业化方面成功经验及重要作用。美国POCC的运作模式和成功要素为理解如何帮助创业团队评估商业可行性提供了有价值的参考;基于对美国经验的分析,提出了一系列针对中国在POCC建设方面的策略和建议,包括发挥政府引导作用、融合多元主体和强化创新体系、发挥中国特色。这些建议旨在促进科技成果的商业化,加强大学、政府和企业之间的协同创新,从而推动科技创新不断面向国民经济主战场。
