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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

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

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

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 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4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

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

Lithium niobate microresonator-based spectrally multiplexed entangled photon pairs

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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 UniversityBeijing 100084China

Integrated quantum photonics combining the micron-scale fabrication technique and quantum information carriers promises a new platform for quantum computation and communication systems [1,2]. Integrated chips remarkably reduce the footprint of the quantum processor and make complicated quantum networks into reality. Nevertheless, to fulfill the increasing need of massive qubits in quantum networks, quantum sources of multiple qubits are widely requested [3].

关键词： quantum remarkably networks

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