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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

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

Lattice-based access authentication scheme for quantum communication networks

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Science China(Information Sciences) 2024年

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.

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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

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

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

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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

Efficient universal quantum channel simulation in IBM＇s cloud quantum computer

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Science China(Physics,Mechanics & Astronomy) 2018年第7期61卷 44-53页

作者： Shi-Jie Wei Tao Xin gui-lu long State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China Tsinghua National Laboratory of Information Science and Technology Beijing 100084 China Collaborative Innovation Center of Quantum Matter Beijing 100084 China

The study of quantum channels is an important field and promises a wide range of applications, because any physical process can be represented as a quantum channel that transforms an initial state into a final state. Inspired by the method of performing non-unitary operators by the linear combination of unitary operations, we proposed a quantum algorithm for the simulation of the universal single-qubit channel, described by a convex combination of ＂quasi-extreme＂ channels corresponding to four Kraus operators, and is scalable to arbitrary higher dimension. We demonstrated the whole algorithm experimentally using the universal IBM cloud-based quantum computer and studied the properties of different qubit quantum channels. We illustrated the quantum capacity of the general qubit quantum channels, which quantifies the amount of quantum information that can be protected. The behavior of quantum capacity in different channels revealed which types of noise processes can support information transmission, and which types are too destructive to protect information. There was a general agreement between the theoretical predictions and the experiments, which strongly supports our method. By realizing the arbitrary quhit channel, this work provides a universally- accepted way to explore various properties of quantum channels and novel prospect for quantum communication.

关键词： quantum channel quantum algorithm quantum capacity IBM quantum cloud