AAPPS Bulletin最新文献_第8页

Recent progress on coherent computation based on quantum squeezing 基于量子挤压的相干计算最新进展

AAPPS Bulletin Pub Date : 2023-03-01 DOI: 10.1007/s43673-023-00077-4

Bo Lu, Lu Liu, Jun-Yang Song, Kai Wen, Chuan Wang

引用次数: 0

News and views (1&2) 新闻和观点 (1&2)

AAPPS Bulletin Pub Date : 2023-02-16 DOI: 10.1007/s43673-023-00075-6

AAPPS Bulletin

引用次数: 0

Squeezing for cosmic symphony 挤出宇宙交响乐

AAPPS Bulletin Pub Date : 2023-02-15 DOI: 10.1007/s43673-023-00076-5

Mengyao Wang, Fan Zhang

引用次数: 0

Ultrawide-bandgap semiconductor of carbon-based materials for meta-photonics-heterostructure, lasers, and holographic displays 碳基材料超宽带隙半导体用于元光子学--异质结构、激光器和全息显示器

AAPPS Bulletin Pub Date : 2023-01-27 DOI: 10.1007/s43673-022-00073-0

Arwa Saud Abbas

{"title":"Ultrawide-bandgap semiconductor of carbon-based materials for meta-photonics-heterostructure, lasers, and holographic displays","authors":"Arwa Saud Abbas","doi":"10.1007/s43673-022-00073-0","DOIUrl":"10.1007/s43673-022-00073-0","url":null,"abstract":"<div><p>Carbon-based materials (CM) growth techniques include common growth factors for meta-photonics-heterostructure, holographic displays, and lasers. In this article, a review of basic growth using several sources is presented. The solid and gas sources of CVD and PLD techniques are discussed. Additionally, doping types and the fabrication of the CM devices are covered to satisfy the requirements of the light emitters’ functionality in the physics of materials as follows: (a) direct bandgap, (b) UV range of 0.1 μm < λ<sub>G</sub> < 0.4 μm, 12.40 eV < E<sub>G</sub> > 3.10 eV, and (c) p-n junction formation. Additionally, conversion of injected electrical current into light in the semiconductor materials using the anti-electrons process for creating light emitters is proposed. Therefore, this review study explores the potential of the selected CM sources as an inexpensive and abundantly available renewable natural source for highly crystalline nanolayers. The CM status of epitaxial thin-film growth is introduced as well as device-processing technologies for prediction. Finally, the positron process in direct light conversion is discussed.</p></div>","PeriodicalId":100007,"journal":{"name":"AAPPS Bulletin","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s43673-022-00073-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74551008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coupling-selective quantum optimal control in weak-coupling NV-(^{13})C system 弱耦合 NV-(^{13})C 系统中的耦合选择性量子优化控制

AAPPS Bulletin Pub Date : 2023-01-05 DOI: 10.1007/s43673-022-00072-1

Feihao Zhang, Jian Xing, Xiaoxiao Hu, Xinyu Pan, Guilu Long

{"title":"Coupling-selective quantum optimal control in weak-coupling NV-(^{13})C system","authors":"Feihao Zhang, Jian Xing, Xiaoxiao Hu, Xinyu Pan, Guilu Long","doi":"10.1007/s43673-022-00072-1","DOIUrl":"10.1007/s43673-022-00072-1","url":null,"abstract":"<div><p>Quantum systems are under various unwanted interactions due to their coupling with the environment. Efficient control of quantum system is essential for quantum information processing. Weak-coupling interactions are ubiquitous, and it is very difficult to suppress them using optimal control method, because the control operation is at a time scale of the coherent life time of the system. Nitrogen-vacancy (NV) center of diamond is a promising platform for quantum information processing. The <span>(^{13})</span>C nuclear spins in the bath are weakly coupled to the NV, rendering the manipulation extremely difficulty. Here, we report a coupling selective optimal control method that selectively suppresses unwanted weak coupling interactions and at the same time greatly prolongs the life time of the wanted quantum system. We applied our theory to a 3 qubit system consisting of one NV electron spin and two <span>(^{13})</span>C nuclear spins through weak-coupling with the NV center. In the experiments, the iSWAP<span>(^{dagger })</span> gate with selective optimal quantum control is implemented in a time-span of <span>(T_{ctrl})</span>= 170.25 <span>(mu)</span>s, which is comparable to the phase decoherence time <span>(T_2)</span>= 203 <span>(mu s)</span>. The two-qubit controlled rotation gate is also completed in a strikingly 1020(80) <span>(mu)</span>s, which is five times of the phase decoherence time. These results could find important applications in the NISQ era.</p></div>","PeriodicalId":100007,"journal":{"name":"AAPPS Bulletin","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s43673-022-00072-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72901175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Status of the RAON project in Korea 韩国 RAON 项目的现状

AAPPS Bulletin Pub Date : 2023-01-03 DOI: 10.1007/s43673-022-00074-z

Byungsik Hong

引用次数: 0

Quantized fields induced topological features in Harper-Hofstadter model 哈珀-霍夫斯塔特模型中的量化场诱导拓扑特征

AAPPS Bulletin Pub Date : 2023-01-02 DOI: 10.1007/s43673-022-00071-2

Xue Han, Fude Li, De-Xiu Qiu, Kang Xue, X. X. Yi

{"title":"Quantized fields induced topological features in Harper-Hofstadter model","authors":"Xue Han, Fude Li, De-Xiu Qiu, Kang Xue, X. X. Yi","doi":"10.1007/s43673-022-00071-2","DOIUrl":"10.1007/s43673-022-00071-2","url":null,"abstract":"<div><p>Classical magnetic fields might change the properties of topological insulators such as the time reversal symmetry protected topological edge states. This poses a question that whether quantized fields would change differently the feature of topological materials with respect to the classical one. In this paper, we propose a model to describe topological insulators (ultracold atoms in square optical lattices with magnetic field) coupled to a tunable single-mode quantized field, and discuss the topological features of the system. We find that the quantized field can induce topological quantum phase transitions in a different way. To be specific, for fixed gauge magnetic flux ratio, we calculate the energy bands for different coupling constants between the systems and the fields in both open and periodic boundary conditions. We find that the Hofstadter <i>butterfly</i> graph is divided into a pair for continuous gauge magnetic flux ratio, which is different from the one without single-mode quantized field. In addition, we plot topological phase diagrams characterized by Chern number as a function of the momentum of the single-mode quantized field and obtain a quantized structure with non-zero filling factor.</p></div>","PeriodicalId":100007,"journal":{"name":"AAPPS Bulletin","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s43673-022-00071-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80040809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

News and views (11&12) 新闻和观点 (11&12)

AAPPS Bulletin Pub Date : 2022-12-22 DOI: 10.1007/s43673-022-00066-z

AAPPS Bulletin

引用次数: 0

Complex Berry curvature and complex energy band structures in non-Hermitian graphene model 非赫米提石墨烯模型中的复杂贝里曲率和复杂能带结构

AAPPS Bulletin Pub Date : 2022-12-09 DOI: 10.1007/s43673-022-00065-0

Chao Wu, Annan Fan, Shi-Dong Liang

{"title":"Complex Berry curvature and complex energy band structures in non-Hermitian graphene model","authors":"Chao Wu, Annan Fan, Shi-Dong Liang","doi":"10.1007/s43673-022-00065-0","DOIUrl":"10.1007/s43673-022-00065-0","url":null,"abstract":"<div><p>Non-Hermitian quantum systems exhibit many novel physical properties of quantum states. We consider a non-Hermtian graphene model based on the tight-binding approximation with the coupling of the graphene and the substrate. We analyze the complex energy structure of this model and its exceptional points as well as relevant topological invariants. We give the analytic complex Berry connection and Berry curvature in the Brillouin zone and investigate numerically the relationships between the complex Berry curvature and the complex energy band structures. We find that the behaviors of the complex Berry curvature depend on the complex energy band structures. The occurrence of the peaks of both real and imaginary parts of the complex Berry curvature corresponds to the exceptional (gapless) points in the Brillouin zone. In particular, the Dirac cone of the imaginary part of the Berry curvature occurs and corresponding to the occurrence of the flat real energy band for the non-Hermitian parameter <span>(eta =3)</span>. These results provide some novel insights to the relationship between the non-Hermitian graphene, geometry, and topological invariants.</p></div>","PeriodicalId":100007,"journal":{"name":"AAPPS Bulletin","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s43673-022-00065-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79215325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spin-orbital-angular-momentum-coupled quantum gases 自旋轨道角动量耦合量子气体

AAPPS Bulletin Pub Date : 2022-12-05 DOI: 10.1007/s43673-022-00069-w

Shi-Guo Peng, Kaijun Jiang, Xiao-Long Chen, Ke-Ji Chen, Peng Zou, Lianyi He

{"title":"Spin-orbital-angular-momentum-coupled quantum gases","authors":"Shi-Guo Peng, Kaijun Jiang, Xiao-Long Chen, Ke-Ji Chen, Peng Zou, Lianyi He","doi":"10.1007/s43673-022-00069-w","DOIUrl":"10.1007/s43673-022-00069-w","url":null,"abstract":"<div><p>We briefly review the recent progress of theories and experiments on spin-orbital-angular-momentum (SOAM)-coupled quantum gases. The coupling between the intrinsic degree of freedom of particles and their external orbital motions widely exists in the universe and leads to a broad variety of fundamental phenomena in both classical physics and quantum mechanics. The recent realization of synthetic SOAM coupling in cold atoms has attracted a great deal of attention and stimulated a large amount of considerations on exotic quantum phases in both Bose and Fermi gases. In this review, we present a basic idea of engineering SOAM coupling in neutral atoms, starting from a semiclassical description of atom-light interaction. Unique features of single-particle physics in the presence of SOAM coupling are discussed. The intriguing ground-state quantum phases of weakly interacting Bose gases are introduced, with emphasis on a so-called angular stripe phase, which has not yet been observed at present. It is demonstrated how to generate a stable giant vortex in a SOAM-coupled Fermi superfluid. We also discuss the topological characters of a Fermi superfluid in the presence of SOAM coupling. We then introduce the experimental achievement of SOAM coupling in <span>(^{87})</span>Rb Bose gases and its first observation of phase transitions. The most recent development of SOAM-coupled Bose gases in experiments is also summarized. Regarding the controllability of ultracold quantum gases, it opens a new era, from the quantum simulation point of view, to study the fundamental physics resulting from SOAM coupling as well as newly emergent quantum phases.</p></div>","PeriodicalId":100007,"journal":{"name":"AAPPS Bulletin","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s43673-022-00069-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89096255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0