npj Quantum Information最新文献_第7页

Unleashed from constrained optimization: quantum computing for quantum chemistry employing generator coordinate inspired method 从约束优化中释放：采用生成器坐标启发方法的量子化学量子计算

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-12-03 DOI: 10.1038/s41534-024-00916-8

Muqing Zheng, Bo Peng, Ang Li, Xiu Yang, Karol Kowalski

{"title":"Unleashed from constrained optimization: quantum computing for quantum chemistry employing generator coordinate inspired method","authors":"Muqing Zheng, Bo Peng, Ang Li, Xiu Yang, Karol Kowalski","doi":"10.1038/s41534-024-00916-8","DOIUrl":"https://doi.org/10.1038/s41534-024-00916-8","url":null,"abstract":"Hybrid quantum-classical approaches offer potential solutions to quantum chemistry problems, yet they often manifest as constrained optimization problems. Here, we explore the interconnection between constrained optimization and generalized eigenvalue problems through the Unitary Coupled Cluster (UCC) excitation generators. Inspired by the generator coordinate method, we employ these UCC excitation generators to construct non-orthogonal, overcomplete many-body bases, projecting the system Hamiltonian into an effective Hamiltonian, which bypasses issues such as barren plateaus that heuristic numerical minimizers often encountered in standard variational quantum eigensolver (VQE). Diverging from conventional quantum subspace expansion methods, we introduce an adaptive scheme that robustly constructs the many-body basis sets from a pool of the UCC excitation generators. This scheme supports the development of a hierarchical ADAPT quantum-classical strategy, enabling a balanced interplay between subspace expansion and ansatz optimization to address complex, strongly correlated quantum chemical systems cost-effectively, setting the stage for more advanced quantum simulations in chemistry.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"116 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142760078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A quantum leaky integrate-and-fire spiking neuron and network 一个量子泄漏的集成和触发神经元和网络

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-12-02 DOI: 10.1038/s41534-024-00921-x

Dean Brand, Francesco Petruccione

{"title":"A quantum leaky integrate-and-fire spiking neuron and network","authors":"Dean Brand, Francesco Petruccione","doi":"10.1038/s41534-024-00921-x","DOIUrl":"https://doi.org/10.1038/s41534-024-00921-x","url":null,"abstract":"Quantum machine learning is in a period of rapid development and discovery, however it still lacks the resources and diversity of computational models of its classical complement. With the growing difficulties of classical models requiring extreme hardware and power solutions, and quantum models being limited by noisy intermediate-scale quantum (NISQ) hardware, there is an emerging opportunity to solve both problems together. Here we introduce a new software model for quantum neuromorphic computing — a quantum leaky integrate-and-fire (QLIF) neuron, implemented as a compact high-fidelity quantum circuit, requiring only 2 rotation gates and no CNOT gates. We use these neurons as building blocks in the construction of a quantum spiking neural network (QSNN), and a quantum spiking convolutional neural network (QSCNN), as the first of their kind. We apply these models to the MNIST, Fashion-MNIST, and KMNIST datasets for a full comparison with other classical and quantum models. We find that the proposed models perform competitively, with comparative accuracy, with efficient scaling and fast computation in classical simulation as well as on quantum devices.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"13 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142760079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Can quantum computers do nothing? 量子计算机可以什么都不做吗？

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-11-26 DOI: 10.1038/s41534-024-00918-6

Alexander Nico-Katz, Nathan Keenan, John Goold

引用次数: 0

Characterizing coherent errors using matrix-element amplification 利用矩阵元素放大技术确定相干误差的特征

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-11-22 DOI: 10.1038/s41534-024-00917-7

Jonathan A. Gross, Élie Genois, Dripto M. Debroy, Yaxing Zhang, Wojciech Mruczkiewicz, Ze-Pei Cian, Zhang Jiang

引用次数: 0

Hardware-tailored diagonalization circuits 硬件定制对角化电路

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-11-21 DOI: 10.1038/s41534-024-00901-1

Daniel Miller, Laurin E. Fischer, Kyano Levi, Eric J. Kuehnke, Igor O. Sokolov, Panagiotis Kl. Barkoutsos, Jens Eisert, Ivano Tavernelli

{"title":"Hardware-tailored diagonalization circuits","authors":"Daniel Miller, Laurin E. Fischer, Kyano Levi, Eric J. Kuehnke, Igor O. Sokolov, Panagiotis Kl. Barkoutsos, Jens Eisert, Ivano Tavernelli","doi":"10.1038/s41534-024-00901-1","DOIUrl":"https://doi.org/10.1038/s41534-024-00901-1","url":null,"abstract":"A central building block of many quantum algorithms is the diagonalization of Pauli operators. Although it is always possible to construct a quantum circuit that simultaneously diagonalizes a given set of commuting Pauli operators, only resource-efficient circuits can be executed reliably on near-term quantum computers. Generic diagonalization circuits, in contrast, often lead to an unaffordable SWAP gate overhead on quantum devices with limited hardware connectivity. A common alternative is to exclude two-qubit gates altogether. However, this comes at the severe cost of restricting the class of diagonalizable sets of Pauli operators to tensor product bases (TPBs). In this article, we introduce a theoretical framework for constructing hardware-tailored (HT) diagonalization circuits. Our framework establishes a systematic and highly flexible procedure for tailoring diagonalization circuits with ultra-low gate counts. We highlight promising use cases of our framework and – as a proof-of-principle application – we devise an efficient algorithm for grouping the Pauli operators of a given Hamiltonian into jointly-HT-diagonalizable sets. For several classes of Hamiltonians, we observe that our approach requires fewer measurements than conventional TPB approaches. Finally, we experimentally demonstrate that HT circuits can improve the efficiency of estimating expectation values with cloud-based quantum computers.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"231 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Many-body entanglement via ‘which-path’ information 通过 "路径 "信息实现多体纠缠

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-11-21 DOI: 10.1038/s41534-024-00899-6

Ron Ruimy, Offek Tziperman, Alexey Gorlach, Klaus Mølmer, Ido Kaminer

引用次数: 0

Local testability of distance-balanced quantum codes 距离平衡量子密码的局部可测试性

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-11-20 DOI: 10.1038/s41534-024-00908-8

Adam Wills, Ting-Chun Lin, Min-Hsiu Hsieh

引用次数: 0

Optical and spin coherence of Er spin qubits in epitaxial cerium dioxide on silicon 硅基外延二氧化铈中 Er 自旋量子比特的光学和自旋相干性

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-11-20 DOI: 10.1038/s41534-024-00903-z

Jiefei Zhang, Gregory D. Grant, Ignas Masiulionis, Michael T. Solomon, Jonathan C. Marcks, Jasleen K. Bindra, Jens Niklas, Alan M. Dibos, Oleg G. Poluektov, F. Joseph Heremans, Supratik Guha, David D. Awschalom

{"title":"Optical and spin coherence of Er spin qubits in epitaxial cerium dioxide on silicon","authors":"Jiefei Zhang, Gregory D. Grant, Ignas Masiulionis, Michael T. Solomon, Jonathan C. Marcks, Jasleen K. Bindra, Jens Niklas, Alan M. Dibos, Oleg G. Poluektov, F. Joseph Heremans, Supratik Guha, David D. Awschalom","doi":"10.1038/s41534-024-00903-z","DOIUrl":"https://doi.org/10.1038/s41534-024-00903-z","url":null,"abstract":"Robust spin-photon interfaces with optical transitions in the telecommunication band are essential for quantum networking technologies. Erbium (Er) ions are the ideal candidate with environmentally protected transitions in telecom-C band. Finding the right technologically compatible host material to enable long-lived spins remains a major hurdle. We introduce a new platform based on Er ions in cerium dioxide (CeO2) as a nearly-zero nuclear spin environment (0.04%) epitaxially grown on silicon, offering silicon compatibility for opto-electrical devices. Our studies focus on Er3+ ions and show a narrow homogeneous linewidth of 440 kHz with an optical coherence time of 0.72 μs at 3.6 K. The reduced nuclear spin noise enables a slow spin-lattice relaxation with a spin relaxation time up to 2.5 ms and an electron spin coherence time of 0.66 μs (in the isolated ion limit) at 3.6 K. These findings highlight the potential of Er3+:CeO2 platform for quantum networks applications.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"11 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

End-to-end variational quantum sensing 端到端变异量子传感

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-11-19 DOI: 10.1038/s41534-024-00914-w

Benjamin MacLellan, Piotr Roztocki, Stefanie Czischek, Roger G. Melko

引用次数: 0

Guarantees on the structure of experimental quantum networks 实验量子网络结构的保证

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-11-14 DOI: 10.1038/s41534-024-00911-z

Andrés Ulibarrena, Jonathan W. Webb, Alexander Pickston, Joseph Ho, Alessandro Fedrizzi, Alejandro Pozas-Kerstjens

引用次数: 0