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A bright integrated photon pair source

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Science China(Physics,Mechanics & Astronomy) 2020年第2期63卷 1-2页

作者： Gui-lu long Department of Physics Tsinghua University

The generation and detection of single photons and photon pairs are crucial to quantum information processing[1-7].Of the various techniques,integrated photonics plays an important *** has the advantages of mature complementary metal-oxide-semiconductor(CMOS)mass-fabrication,miniaturization,scalability,stability and reconfigurability,thus becoming a natural choice for integrated quantum information ***,due to the lack of second-order nonlinearity,the silicon chip usually adopts the relatively weak third-order nonlinear interaction,namely the spontaneous four-wave mixing,to generate photon *** improve the photon pair generation rate,silicon micro-ring resonators are considered candidates capable of enhancing the intense intracavity field for the pump,signal and idler photons.

关键词： pump photon quantum

Interfacing superconducting and atomic qubits via unconventional geometric quantum operations

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Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 1-2页

作者： Gui-lu long Department of Physics Tsinghua UniversityBeijing100084China

Interfacing or entanglement between spatially separated quantum systems,such as superconducting qubits,semiconductor quantum dots,atomic qubits,and solid-state color centers,is crucial in quantum networks and distributed quantum computation[1].Significant progress has been made in generating entanglement between spatially separated quantum systems via optical links[2],while remote superconducting chips,whose quantum states are easily spoiled by optical photons,have been entangled via cryogenic microwave links[3].

关键词： quantum superconducting spatially

Lattice-based access authentication scheme for quantum communication networks

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Science China(Information Sciences) 2024年第12期67卷 311-317页

作者： Min WANG Gui-lu long Beijing Academy of Quantum Information Sciences State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics Tsinghua University Frontier Science Center for Quantum Information Beijing National Research Center for Information Science and Technology

Access authentication scheme plays a foundational role in ensuring the security of communication networks. However, an access authentication scheme with high security and efficiency is still lacking in quantum communication networks. In this paper, we propose a lattice-based access authentication scheme for quantum communication networks in the manner of real-time interaction with the network control center,which could achieve properties of mutual authentication, conditional anonymity, data confidentiality, unforgeability, undeniability, and data integrity. We utilize the digital signature algorithm CRYSTALS-Dilithium and the key-establishment algorithm CRYSTALS-KYBER, both of which have been selected for standardization by the National Institute of Standards and Technology, to realize secure access authentication for users of the quantum communication networks. Specifically, in the quantum secure direct communication network, key-establishment is replaced by the verification of signatures encoded in quantum states. Our results demonstrate the feasibility of establishing a quantum-secure communication network.

关键词： quantum communication quantum network access authentication post-quantum cryptography network control center

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A new twist to the interplay between superconductivity and Kondo correlation

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 1-2页

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

Recently,Deng et al.[1] found a new twist to the intriguing physics resulting from the interplay between Kondo correlation and *** correlation [2,3] and superconductivity [4,5] are two fundamental phenomena in condens... 详细信息

关键词： Kondo twist

Toward applications of cloud quantum computation

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Science China(Physics,Mechanics & Astronomy) 2022年第11期65卷 82-83页

作者： Gui-lu long State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing100084China Beijing Academy of Quantum Information Science Beijing100193China Frontier Science Center for Quantum Information Beijing100084China Beijing National Research Center Information Science and Technology and School of Information Tsinghua UniversityBeijing100084China

Quantum computation has attracted much attention from both academia and the public due to its great achievements. Along with its fast development and increasing investment, a series of problems are raised. For example, can quantum supremacy be realized? Recently, several results have been reported to address the problem of sampling random circuits, accompanied by classical improvements [1-3]. Another problem worthy of note is how to use a quantum computer. Irrelevant to specific problems that can be solved by a quantum computer, this is actually a problem about how many users can conveniently access quantum computation resources.

关键词： quantum computation conveniently

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What is the wave function in quantum mechanics？

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Science Bulletin 2017年第20期62卷 1355-1356页

作者： Gui-lu long State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China The Innovative Center of Quantum Matter Beijing 100084 China Tsinghua National Laboratory of Information Science and Technology Beijing 100084 China

Quantum mechanics, is a pillar of modern science and technology, and has benefited human society for a century. Quantum mechanics works well, its predictions agree amazingly well with experiments, and its mathematical... 详细信息

关键词： quantum mechanics function

A Versatile,Electrophilic Reagent for Monofluoromethylthiolation

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Chinese Journal of Chemistry 2023年第18期41卷 2317-2329页

作者： Rui Wang long lu Qilong Shen Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChineseAcademyof Sciences345 Lingling RoadShanghai 200032China

Comprehensive Summary,A new electrophilic monofluoromethylthiolating reagent N-fluoromethylthiophthalimide PhthSCH2F 1 was *** 1 could be readily synthesized from easily available starting materials benzyl mercaptan and CH_(2)FCl in three steps.N-Fluoromethylthiophthalimide 1 is a powerful electrophilic monofluoromethylthiolating reagent that allows the monofluoromethylthiolation of a wide range of nucleophiles including alkynes,aryl/vinyl boronic acids,electron-rich heteroarenes,β-ketoesters and oxindoles,as well as thiols under mild conditions.

关键词： Fluorine Monofluoromethylthiolation Electrophilic Sulfur

Experimental demonstration of concatenated composite pulses robustness to non-static errors

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Science China(Physics,Mechanics & Astronomy) 2016年第9期59卷 46-51页

作者： Xing-long Zhen Tao Xin Fei-Hao Zhang Gui-lu long State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China Innovation Centre of Quantum Matter Beijing 100084 China Tsinghua National Laboratory For Information Science and Technology Tsinghua University Beijing 100084 China

We examine the robustness of composite pulses to non-static classic noise in the NMR facility. Though these pulses are proposed to eliminate static, systematic errors, they are shown to be robust to time-varying noise with high-cut frequency up to near 10% of the Rabi frequency in a recent theoretical work. The CP pulses that are only robust to one kind of error have been implemented in various experiment platforms. In this paper we have compared the performance of reduced CinSK rc pulse, which is designed to cancel both the pulse length error and the off resonance error, to that of the primitive n pulse in a hybrid error environment. In order to achieve this target we have simultaneously injected noise to the RF output wave. The filter function formalism is employed to predict the evolution fidelity decay, which shows great consistency with the experiment data. Our work not only validates the superiority of reduced CinSK pulse but also indicates its sensitivity to the initial states, providing practical guidance in the noise suppression domain.

关键词： composite pulse filter function quantum control NMR

Multi-indicator assessment of water environment in government environmental auditing

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Journal of Environmental Sciences 2007年第4期19卷 494-501页

作者： HE Gui-zhen lu Yong-long MA Hua WANG Xiao-long Research Centre for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China. Graduate University of the Chinese Academy of Sciences Beijing 100039 China

This study focused on a multi-indicator assessment methodology for governmental environmental auditing of water protection programs. The environmental status of Wuli Lake in China was assessed using the global indicators （driver-status-response） developed by the Commission on Sustainable Development, and four additional indicators proposed by the author： water quality, pollution load, aquatic ecosystem status, and lake sediment deposition. Various hydrological, chemical, biological and environmental parameters were used to estimate the values of the indicators for assessment of environmental status of the lake based on time series data sets for twenty years. The indicators proposed can be customized to meeting the needs for particular assessment of water protection programs. This method can be used to evaluate the performance of national environmental protection programs and provide technical support for environmental auditors.

关键词： environmental auditing environmental indicators pollution load lake ecosystem state assessment