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Enhanced Sensing Mechanism Based on Shifting an Exceptional Point

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Research 2024年第3期6卷 285-292页

作者： Xuan Mao Guo-Qing Qin Hao Zhang Bo-Yang Wang Dan long Gui-Qin Li Gui-lu long Department of Physics State Key Laboratory of Low-Dimensional Quantum PhysicsTsinghua UniversityBeijing 100084China Beijing Institute of Radio Measurement The Second Academy of China Aerospace Science and Industry Corporation(CASIC)Beijing 100854China Purple Mountain Laboratories Nanjing 21111China Frontier Science Center for Quantum Information Beijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China

Non-Hermitian systems associated with exceptional points (EPs) are expected to demonstrate a giant response enhancement for various sensors. The widely investigated enhancement mechanism based on diverging from an EP should destroy the EP and further limits its applications for multiple sensing scenarios in a time sequence. To break the above limit, here, we proposed a new enhanced sensing mechanism based on shifting an EP. Different from the mechanism of diverging from an EP, our scheme is an EP nondemolition and the giant enhancement of response is acquired by a slight shift of the EP along the parameter axis induced by perturbation. The new sensing mechanism can promise the most effective response enhancement for all sensors in the case of multiple sensing in a time sequence. To verify our sensing mechanism, we construct a mass sensor and a gyroscope with concrete physical implementations. Our work will deepen the understanding of EP-based sensing and inspire designing various high-sensitivity sensors in different physical systems.

关键词： mechanism shifting exceptional

Access to Versatile Functionalized Cu(Ⅲ) Complexes Enabled by Direct Transmetalation to Well-Defined Copper(Ⅲ) Fluoride Complex Me_(4)N^(+)[Cu(CF_(3))_(3)F]^(-)

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Chinese Journal of Chemistry 2024年第10期42卷 1107-1113页

作者： Guangyu Wang Huaiyuan Li Xuebing Leng long lu Qilong Shen Key Laboratory of Fluorine and Nitrogen Chemistry and Advanced Materials Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences345 Lingling LuShanghai 200032China

The invention of a well-defined Cu(Ⅲ)fluoride complex Me_(4)N^(+)[Cu(CF_(3))_(3)(F)]^(-)1 enabled to access a versatile of functionalized Cu(Ⅲ)complexes[Me_(4)N]^(+)[Cu(X)(CF_(3))_(3)]^(-)(X=C_(6)F_(5),C_(6)F_(5)C≡C,CN,Cl,N_(3),^(t)BuOO,SCN,OAc,SAr),many of them for the first *** availability of these complexes allowed us to evaluate the trans-influence order of ligand in Cu(Ⅲ)complexes:Bn>CF_(3)^(-)>C_(6)F_(5)^(-)>N_(3)^(-)>py~CH_(3)^(-)~C_(6)F_(5)C≡C>NO_(2)PhO^(-)~^(t)BuOO^(-)~CH_(3)COO^(-)>F^(-).

关键词： Fluorine Copper Cu(Ⅲ) Cu(Ⅲ)fluoride Trifluoromethyl

A commentary of“Prolonging the lifetime of logic qubits by Bosonic error-correcting code-realizing the break-even point of quantum error correction”:Top 10 Scientific Advances of 2023,China

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Fundamental Research 2024年第3期4卷 706-707页

作者： Gui-lu long State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China

At present,we are in the noisy-intermediate-scale-quantum era of quantum information science and technology[1],in which there are relatively large numbers of qubits with *** instance,the error rate of current superconducting qubits is orders of magnitude away from practical *** solve this problem,various methods have been used,such as holonomic quantum gate[2],dynamical decoupling[3],entanglement purification[4],and quantum error correction[5].

关键词： quantum correction error

Variational quantum algorithm for node embedding

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Fundamental Research 2024年第4期4卷 845-850页

作者： Zeng-rong Zhou Hang Li Gui-lu long Research Center for Quantum Sensing Zhejiang LabHangzhou 311121China Bejing Academy of Quantum Information Sciences Beijing 100193China State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China

Quantum machine learning has made remarkable progress in many important ***,the gate complexity of the initial state preparation is seldom considered in lots of quantum machine learning algorithms,making them ***,we propose a quantum algorithm for the node embedding problem that maps a node graph's topological structure to embedding *** resulting quantum embedding state can be used as an input for other quantum machine learning *** O(log(N))qubits to store the information of N nodes,our algorithm will not lose quantum advantage for the subsequent quantum information ***,owing to the use of a parameterized quantum circuit with O(poly(log(N)))depth,the resulting state can serve as an efficient quantum *** addition,we explored the measurement complexity of the quantum node embedding algorithm,which is the main issue in training parameters,and extended the algorithm to capture high-order neighborhood information between ***,we experimentally demonstrated our algorithm on an nuclear magnetic resonance quantum processor to solve a graph model.

关键词： Quantum machine learning Quantum computation Node embedding Variational quantum algorithm Nuclear magnetic resonance

Suppressing noisy features with quantum filters for efficient encoded images with high signal to noise ratios

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 1-1页

作者： Gui-lu long Department of Physics Tsinghua UniversityBeijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China

Image processing is fundamental in computer vision and imaging research[1,2].Most image processing algorithms rely on Fourier *** is well-known that quantum Fourier transform(QFT)offers exponential speedup compared to their classical counterpart and serves as a crucial component in quantum algorithms such as Shor's factoring algorithm[3]and the HHL algorithm[4]to realize exponential speedup.

关键词： transform quantum exponential

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A new scheme of fully stabilized soliton microcombs

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 1-1页

作者： Gui-lu long Department of Physics Tsinghua UniversityBeijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China

More stable frequency standard has been the focus of studies for a long time^([1,2]).Dissipative Kerr solitons(DKSs)in microresonators have attracted much interest for their potential in on-chip frequency standards^([1]).DKSs provide frequency combs characterized by high coherence,expansive bandwidth,and microwave-repetition rates.

关键词： soliton stabilized scheme

Sand control mechanism of radial well filled with phase change material in hydrate reservoir

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Petroleum Science 2024年第4期21卷 2571-2582页

作者： Xiao-Qiang Liu Zhong-Xi Han Zhi-Lin luo Hai-long lu Ying Sun Qing You Tian-Kui Guo Zhan-Qing Qu School of Energy Resources China University of Geosciences (Beijing) Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering China University of Geosciences (Beijing) China Research Institute of Petroleum Exploration and Development Engineering Technology Research Institute of Southwest Oil & Gas Field Company PetroChina Beijing International Center for Gas Hydrate School of Earth and Space Sciences Peking University School of Advanced Material Peking University Shenzhen Graduate School School of Petroleum Engineering China University of Petroleum (East China)

Radial well filled with phase change material has been proposed as a novel sand control method for hydrate exploitation. In order to reveal the sand control mechanism, CFD-DEM coupling method is applied to simulate the migration, settlement, and blockage processes of sand particles in the radial *** obtained results indicate that three scenarios have been recognized for sand particles passing through sand control medium, based on the diameter ratio of sand control medium to sand particle（Dd）:fully passing（Dd= 8.75-22.5）, partially passing and partially blocked（Dd= 3.18-5.63）, and completely blocked（Dd= 2.18-3.21）. After being captured by the sand control medium, sand particles can block pores, which increases fluid flow resistance and causes a certain pressure difference in the radial *** pressure in the radial well should be lower than the hydrate phase equilibrium pressure during sand control design, for the purpose of promoting hydrate decomposition, and sand capture. The length of the radial well should be optimized based on the reservoir pore pressure, production pressure difference,bottom hole pressure, and the pressure gradient in the radial well. It should be noticed that the sand control medium leads to a decrease in permeability after sand particles captured. Even the permeability is reduced to several hundred millidarcy, it is still sufficient to ensure the effective flow of gas and water after hydrate decomposition. Increasing fluid velocity reduces the blocking capacity of the sand control medium, mainly because of deterioration in bridging between sand particles.

关键词： Hydrate reservoir Sand control Radial well CFD-DEM

Knock-out of GhPDCT with the CRISPR/Cas9 system increases the oleic acid content in cottonseed oil

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Journal of Integrative Agriculture 2024年第10期23卷 3468-3471页

作者： Tingwan Li lu long Yingchao Tang Zhongping Xu Guanying Wang Man Jiang Shuangxia Jin Wei Gao National Key Laboratory of Cotton Bio-breeding and Integrated Utilization/School of Life Science Henan UniversityKaifeng475004China Hubei Hongshan Laboratory/National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural UniversityWuhan430070China

Cotton is a pivotal economic crop for natural textile fibers that also serves as an important source of edible oil(long et al.2023).Cottonseed oil contains approximately14%oleic acid and 59%linoleic *** increase in monounsaturated fatty acids,particularly oleic acid,enhances the oxidative stability and nutritional value of edible oil(Chen et al.2021).

关键词： CRISPR/Cas9 fibers system

Phase-transfer-shuttle generated in situ enables novel S1-type fluorination of sulfonium ylide with hydrofluoric acid

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Science China Chemistry 2024年

作者： Yisa Xiao Rui Wang Zhaoxuan Xu Qunchao Zhao Renyi Pang Tao Dong long lu Qilong Shen Key Laboratory of Fluorine and Nitrogen Chemistry and Advanced Materials Shanghai Institute of Organic Chemistry University of Chinese Academy Sciences Chinese Academy of Sciences

The development of a nucleophilic fluorination protocol using hydrofluoric acid as the fluoride source represents a long-sought goal in the field of organofluorine chemistry. We report herein the realization of such a reaction that employed alkyl-substituted sulfonium ylides as the substrates. The key to the success of the protocol was attributed to two factors: First, as a Br?nsted base,the ylide was able to be protonated by HFaq, thus serving as a phase-transfer shuttle generated in situ to bring F-from aqueous phase to the organic phase promoting desolvation of fluoride ion. Second, after protonation, a sulfonium salt, a good leaving group, was generated and subsequent attacked by the fluoride to afford the alkyl fluoride. Mechanistic investigation indicates that the reaction occurs via an SN1 pathway. Because of the nature of the cationic intermediate in the reaction, two attractive rearrangement-fluorination approaches including 1,2-aryl migration fluorination and ring-expansion fluorination were disclosed.

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