Quantum Frontiers最新文献_第2页

Experimental test of the entanglement enhancement in two-photon fluorescence 双光子荧光中纠缠增强的实验测试

Quantum Frontiers Pub Date : 2024-02-28 DOI: 10.1007/s44214-024-00052-6

引用次数: 0

Quantum lock-in measurement of weak alternating signals 微弱交变信号的量子锁定测量

Quantum Frontiers Pub Date : 2024-02-26 DOI: 10.1007/s44214-024-00051-7

Min Zhuang, Sijie Chen, Jiahao Huang, Chaohong Lee

引用次数: 0

Graphene nanoribbons: current status, challenges and opportunities 石墨烯纳米带：现状、挑战和机遇

Quantum Frontiers Pub Date : 2024-02-20 DOI: 10.1007/s44214-024-00050-8

Shuo Lou, Bosai Lyu, Xianliang Zhou, Peiyue Shen, Jiajun Chen, Zhiwen Shi

引用次数: 0

Test of the gravitational redshift with single-photon-based atomic clock interferometers 用基于单光子的原子钟干涉仪测试引力红移

Quantum Frontiers Pub Date : 2024-02-08 DOI: 10.1007/s44214-024-00049-1

Ju Liu, Yaoyao Xu, Huaqing Luo, Lushuai Cao, Minkang Zhou, Xiaochun Duan, Zhongkun Hu

引用次数: 0

Experimental sensing quantum atmosphere of a single spin 单个自旋的实验感应量子氛围

Quantum Frontiers Pub Date : 2024-01-08 DOI: 10.1007/s44214-023-00048-8

Kehang Zhu, Zhiping Yang, Qing-Dong Jiang, Zihua Chai, Zhijie Li, Zhiyuan Zhao, Ya Wang, Fazhan Shi, Chang-Kui Duan, Xing Rong

引用次数: 0

A self-adaptive first-principles approach for magnetic excited states 磁激发态的自适应第一性原理方法

Quantum Frontiers Pub Date : 2023-12-04 DOI: 10.1007/s44214-023-00041-1

Zefeng Cai, Ke Wang, Yong Xu, Su-Huai Wei, Ben Xu

{"title":"A self-adaptive first-principles approach for magnetic excited states","authors":"Zefeng Cai, Ke Wang, Yong Xu, Su-Huai Wei, Ben Xu","doi":"10.1007/s44214-023-00041-1","DOIUrl":"https://doi.org/10.1007/s44214-023-00041-1","url":null,"abstract":"The profound impact of excited magnetic states on the intricate interplay between electron and lattice behaviors in magnetic materials is a topic of great interest. Unfortunately, despite the significant strides that have been made in first-principles methods, accurately tracking these phenomena remains a challenging and elusive task. The crux of the challenge that lies before us is centered on the intricate task of characterizing the magnetic configuration of an excited state, utilizing a first-principle approach that is firmly rooted in the ground state of the system. We propose a versatile self-adaptive spin-constrained density functional theory formalism. By iteratively optimizing the constraining field alongside the electron wave function during energy minimization, we are able to obtain an accurate potential energy surface that captures the longitudinal and transverse variations of magnetization in itinerant ferromagnetic Fe. Moreover, this technique allows us to identify the subtle coupling between magnetic moments and other degrees of freedom by tracking energy variation, providing new insights into the intricate interplay between magnetic interactions, electronic band structure, and phonon dispersion curves in single-layered (mathrm{CrI} _{3}). This new methodology represents a significant breakthrough in our ability to probe the complex and multifaceted properties of magnetic systems.","PeriodicalId":501227,"journal":{"name":"Quantum Frontiers","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138511668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

3D quantum Hall effect in a topological nodal-ring semimetal 拓扑节环半金属中的三维量子霍尔效应

Quantum Frontiers Pub Date : 2023-12-04 DOI: 10.1007/s44214-023-00046-w

Guang-Qi Zhao, Shuai Li, W. B. Rui, C. M. Wang, Hai-Zhou Lu, X. C. Xie

{"title":"3D quantum Hall effect in a topological nodal-ring semimetal","authors":"Guang-Qi Zhao, Shuai Li, W. B. Rui, C. M. Wang, Hai-Zhou Lu, X. C. Xie","doi":"10.1007/s44214-023-00046-w","DOIUrl":"https://doi.org/10.1007/s44214-023-00046-w","url":null,"abstract":"A quantized Hall conductance (not conductivity) in three dimensions has been searched for more than 30 years. Here we explore it in 3D topological nodal-ring semimetals, by employing a minimal model describing the essential physics. In particular, the bulk topology can be captured by a momentum-dependent winding number, which confines the drumhead surface states in a specific momentum region. This confinement leads to a surface quantum Hall conductance in a specific energy window in this 3D system. The winding number for the drumhead surface states and Chern number for their quantum Hall effect form a two-fold topological hierarchy. We demonstrate the one-to-one correspondence between the momentum-dependent winding number and wavefunction of the drumhead surface states. More importantly, we stress that breaking chiral symmetry is necessary for the quantum Hall effect of the drumhead surface states. The analytic theory can be verified numerically by the Kubo formula for the Hall conductance. We propose an experimental setup to distinguish the surface and bulk quantum Hall effects. The theory will be useful for ongoing explorations on nodal-ring semimetals.","PeriodicalId":501227,"journal":{"name":"Quantum Frontiers","volume":"39 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138511669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Perspective: nanoscale electric sensing and imaging based on quantum sensors 展望:基于量子传感器的纳米级电传感与成像

Quantum Frontiers Pub Date : 2023-11-29 DOI: 10.1007/s44214-023-00045-x

Shichen Zhang, Ke Bian, Ying Jiang

引用次数: 0

Experimental 3D super-localization with Laguerre–Gaussian modes 拉盖尔-高斯模式实验三维超定位

Quantum Frontiers Pub Date : 2023-11-29 DOI: 10.1007/s44214-023-00047-9

Chenyu Hu, Liang Xu, Ben Wang, Zhiwen Li, Yipeng Zhang, Yong Zhang, Lijian Zhang

{"title":"Experimental 3D super-localization with Laguerre–Gaussian modes","authors":"Chenyu Hu, Liang Xu, Ben Wang, Zhiwen Li, Yipeng Zhang, Yong Zhang, Lijian Zhang","doi":"10.1007/s44214-023-00047-9","DOIUrl":"https://doi.org/10.1007/s44214-023-00047-9","url":null,"abstract":"Improving three-dimensional (3D) localization precision is of paramount importance for super-resolution imaging. By properly engineering the point spread function (PSF), such as utilizing Laguerre–Gaussian (LG) modes and their superposition, the ultimate limits of 3D localization precision can be enhanced. However, achieving these limits is challenging, as it often involves complicated detection strategies and practical limitations. In this work, we rigorously derive the ultimate 3D localization limits of LG modes and their superposition, specifically rotation modes, in the multi-parameter estimation framework. Our findings reveal that a significant portion of the information required for achieving 3D super-localization of LG modes can be obtained through feasible intensity detection. Moreover, the 3D ultimate precision can be achieved when the azimuthal index l is zero. To provide a proof-of-principle demonstration, we develop an iterative maximum likelihood estimation (MLE) algorithm that converges to the 3D position of a point source, considering the pixelation and detector noise. The experimental implementation exhibits an improvement of up to two-fold in lateral localization precision and up to twenty-fold in axial localization precision when using LG modes compared to Gaussian mode. We also showcase the superior axial localization capability of the rotation mode within the near-focus region, effectively overcoming the limitations encountered by single LG modes. Notably, in the presence of realistic aberration, the algorithm robustly achieves the Cramér-Rao lower bound. Our findings provide valuable insights for evaluating and optimizing the achievable 3D localization precision, which will facilitate the advancements in super-resolution microscopy.","PeriodicalId":501227,"journal":{"name":"Quantum Frontiers","volume":"38 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138511670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Topological magnetic line defects in Fe(Te, Se) high-temperature superconductors Fe(Te, Se)高温超导体的拓扑磁力线缺陷

Quantum Frontiers Pub Date : 2023-11-27 DOI: 10.1007/s44214-023-00042-0

Xianxin Wu, Jia-Xin Yin, Chao-Xing Liu, Jiangping Hu

{"title":"Topological magnetic line defects in Fe(Te, Se) high-temperature superconductors","authors":"Xianxin Wu, Jia-Xin Yin, Chao-Xing Liu, Jiangping Hu","doi":"10.1007/s44214-023-00042-0","DOIUrl":"https://doi.org/10.1007/s44214-023-00042-0","url":null,"abstract":"The realization of Majorana zero modes in condensed matter have been attracting enormous interests from fundamental science such as topological quantum computation. Recently iron based superconductors were identified as a high-temperature platform for realizing topological superconductivity and Majorana modes. As unconventional superconductors, one of the most important characteristics of them is that they are in the vicinity of magnetic states due to the strong Hund’s coupling in iron atoms. Here we propose that the line defects with missing Te/Se anions in Fe(Se, Te) superconductors provide the realization of intrinsic antiferromagnetic (AFM) chains with Rashba spin-orbit coupling. Against conventional wisdom, Majorana zero modes (MZMs) can be robustly generated at these AFM chain ends. These results can consistently explain the recent experimental observation of zero-energy end states in line defects of monolayer Fe(Te, Se)/SrTiO3 by scanning tunneling microscopy (STM) measurements. Our research not only demonstrates an unprecedented interplay among native line defect, emergent magnetism and topological superconductivity but also explores a high-temperature platform for Majorana fermions.","PeriodicalId":501227,"journal":{"name":"Quantum Frontiers","volume":"40 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138511667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8