Annalen der Physik最新文献_第8页

Semiquantum Key Distribution Using Initial States in Only One Basis Without the Classical User Measuring 半量子密钥分发仅使用一个基点的初始状态，无需经典用户测量

IF 2.2 4区物理与天体物理

Annalen der Physik Pub Date : 2024-05-23 DOI: 10.1002/andp.202300515

Xueying Liang, Xiangfu Zou, Xin Wang, Shenggen Zheng, Zhenbang Rong, Zhiming Huang, Jianfeng Liu, Ying Chen, Jianxiong Wu

引用次数: 0

Exact Functional Integration of Radial and Complex Slave-Boson Fields: Thermodynamics and Dynamics of the Two-Site Extended Hubbard Model 径向和复杂从玻色子场的精确函数积分：双位扩展哈伯德模型的热力学和动力学

IF 2.2 4区物理与天体物理

Annalen der Physik Pub Date : 2024-05-16 DOI: 10.1002/andp.202400029

Vu Hung Dao, Raymond Frésard

{"title":"Exact Functional Integration of Radial and Complex Slave-Boson Fields: Thermodynamics and Dynamics of the Two-Site Extended Hubbard Model","authors":"Vu Hung Dao, Raymond Frésard","doi":"10.1002/andp.202400029","DOIUrl":"10.1002/andp.202400029","url":null,"abstract":"The functional integral formulation of the Hubbard model when treated in its Kotliar-Ruckenstein representation in the radial gauge involves fermionic, as well as complex and radial slave boson fields. In order to improve on the understanding of the interplay of the three types of fields, and on the nature of the latter, a comprehensive investigation of an exactly solvable two-site cluster is performed, as it entails all pitfalls embodied in this approach. It is first shown that the exact partition function is recovered, even when incorporating in the calculation the square root factors that are at the heart of the representation, when suitably regularized. It is shown that using radial slave boson fields allows to overcome all hurdles following from the normal ordering procedure. It is then demonstrated that this applies to the Green's function as well, and to the correlation functions of physical interest, thereby answering the criticisms raised by Schönhammer [K. Schönhammer, Phys. Rev. B 1990 42, 2591]. In addition, the investigation generalizes the calculations to the Hubbard model extended by a non-local Coulomb interaction.","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141060516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

On the History of the Lennard-Jones Potential 伦纳德-琼斯电位的历史

IF 2.4 4区物理与天体物理

Annalen der Physik Pub Date : 2024-05-16 DOI: 10.1002/andp.202400115

Johannes Lenhard, Simon Stephan, Hans Hasse

引用次数: 0

Masthead: Ann. Phys. 5/2024 刊头Ann.5/2024

IF 2.4 4区物理与天体物理

Annalen der Physik Pub Date : 2024-05-12 DOI: 10.1002/andp.202470012

引用次数: 0

(Ann. Phys. 5/2024) (Ann. Phys. 5/2024)

IF 2.4 4区物理与天体物理

Annalen der Physik Pub Date : 2024-05-12 DOI: 10.1002/andp.202470011

引用次数: 0

Improving the Performance of Cooling and Entanglement in a Double Cavity Optomechanical System Assisted by the Quantum Coherent Feedback 利用量子相干反馈改善双腔光机系统中的冷却和纠缠性能

IF 2.2 4区物理与天体物理

Annalen der Physik Pub Date : 2024-05-09 DOI: 10.1002/andp.202400036

Yuan Chen, Ai-Xi Chen

引用次数: 0

Analytic Continuation of Multipoint Correlation Functions 多点相关函数的解析续集

IF 2.2 4区物理与天体物理

Annalen der Physik Pub Date : 2024-05-01 DOI: 10.1002/andp.202300504

Anxiang Ge, Johannes Halbinger, Seung-Sup B. Lee, Jan von Delft, Fabian B. Kugler

{"title":"Analytic Continuation of Multipoint Correlation Functions","authors":"Anxiang Ge, Johannes Halbinger, Seung-Sup B. Lee, Jan von Delft, Fabian B. Kugler","doi":"10.1002/andp.202300504","DOIUrl":"10.1002/andp.202300504","url":null,"abstract":"Conceptually, the Matsubara formalism (MF), using imaginary frequencies, and the Keldysh formalism (KF), formulated in real frequencies, give equivalent results for systems in thermal equilibrium. The MF has less complexity and is thus more convenient than the KF. However, computing dynamical observables in the MF requires the analytic continuation from imaginary to real frequencies. The analytic continuation is well-known for two-point correlation functions (having one frequency argument), but, for multipoint correlators, a straightforward recipe for deducing all Keldysh components from the MF correlator had not been formulated yet. Recently, a representation of MF and KF correlators in terms of formalism-independent partial spectral functions and formalism-specific kernels was introduced by Kugler, Lee, and von Delft [Phys. Rev. X 11, 041006 (2021)]. This representation is used to formally elucidate the connection between both formalisms. How a multipoint MF correlator can be analytically continued to recover all partial spectral functions and yield all Keldysh components of its KF counterpart is shown. The procedure is illustrated for various correlators of the Hubbard atom.","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202300504","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140838892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Antimatter Gravity and the Results of the ALPHA-g Experiment 反物质引力与 ALPHA-g 实验结果

IF 2.2 4区物理与天体物理

Annalen der Physik Pub Date : 2024-04-18 DOI: 10.1002/andp.202300519

Massimo Villata

{"title":"Antimatter Gravity and the Results of the ALPHA-g Experiment","authors":"Massimo Villata","doi":"10.1002/andp.202300519","DOIUrl":"10.1002/andp.202300519","url":null,"abstract":"By combining general relativity and CPT symmetry, the theory of CPT gravity predicts gravitational repulsion between matter and CPT-transformed matter, i.e., antimatter inhabiting an inverted space-time. Such repulsive gravity turned out to be an excellent candidate for explaining the accelerated expansion of the Universe, without the need for dark energy. The recent results of the ALPHA-g experiment, which show gravitational attraction between antihydrogen atoms and the Earth, seem to undermine this success in the cosmological field. Analyzing the above theory, two solutions are found that can be consistent with the experimental results, while preserving the large-scale gravitational repulsion. The first highlights how repulsive gravity can be the result of the interaction with an inverted space-time, but occupied by matter and not antimatter, and therefore the antimatter present in our space-time has no reason to exhibit gravitational repulsion. The second retains the original CPT transformation, resulting in repulsive gravity between matter and antimatter, but with the caveat that antimatter immersed in our space-time cannot exhibit the PT transformation which is the cause of the repulsion. Finally, it is shown that, in a Newtonian approximation of the geodesic equation, time reversal is not a necessary operation for repulsive gravity, therefore opening the possibility of an expanding cosmos with a single time direction.","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202300519","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140628594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Attention to Entropic Communication 关注实体交流

IF 2.2 4区物理与天体物理

Annalen der Physik Pub Date : 2024-04-17 DOI: 10.1002/andp.202300334

Torsten Enßlin, Carolin Weidinger, Philipp Frank

{"title":"Attention to Entropic Communication","authors":"Torsten Enßlin, Carolin Weidinger, Philipp Frank","doi":"10.1002/andp.202300334","DOIUrl":"10.1002/andp.202300334","url":null,"abstract":"The concept of attention has proven to be very relevant in artificial intelligence. Relative entropy (RE, aka Kullback-Leibler divergence) plays a central role in communication theory. Here, these concepts, attention, and RE are combined. RE guides optimal encoding of messages in bandwidth-limited communication as well as optimal message decoding via the maximum entropy principle. In the coding scenario, RE can be derived from four requirements, namely being analytical, local, proper, and calibrated. Weighted RE, used for attention steering in communications, turns out to be improper. To see how proper attention communication can emerge, a scenario of a message sender who wants to ensure that the receiver of the message can perform well-informed actions is analyzed. In case only the curvature of the utility function maxima are known, it becomes desirable to accurately communicate an attention function, in this case a by this curvature weighted and re-normalized probability function. Entropic attention communication is here proposed as the desired generalization of entropic communication that permits weighting while being proper, thereby aiding the design of optimal communication protocols in technical applications and helping to understand human communication. It provides the level of cooperation expected under misaligned interests of otherwise honest communication partners.","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202300334","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140614180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optomechanical Coupling Optimization in Engineered Nanocavities 工程纳米腔中的光机耦合优化

IF 2.2 4区物理与天体物理

Annalen der Physik Pub Date : 2024-04-17 DOI: 10.1002/andp.202300417

S. Edelstein, J. Gomis-Bresco, G. Arregui, P. Koval, N. D. Lanzillotti-Kimura, D. Torrent, C. M. Sotomayor-Torres, P. D. García

{"title":"Optomechanical Coupling Optimization in Engineered Nanocavities","authors":"S. Edelstein, J. Gomis-Bresco, G. Arregui, P. Koval, N. D. Lanzillotti-Kimura, D. Torrent, C. M. Sotomayor-Torres, P. D. García","doi":"10.1002/andp.202300417","DOIUrl":"10.1002/andp.202300417","url":null,"abstract":"In optomechanics, the interaction between light and matter is enhanced by engineering cavities where the electromagnetic field and the mechanical displacement are confined simultaneously within the same volume. This leads to a wide range of interesting phenomena, such as optomechanically induced transparency and the cooling of macroscopic objects to their lowest possible motion state. In this manuscript, the focus is on designed optomechanical cavities exploiting heterostructures in air-slot photonic-crystal waveguides, incorporating different hole shapes and dimensions to engineer and control their optomechanical properties. The aim is to maximize the optical quality factor of the optical cavity, while ensuring optical mode volumes below the diffraction limit. These optimized optical modes interact with in-plane motional degrees of freedom of the structures achieving high optomechanical coupling rates, thus opening up the possibility of mechanical amplification, nonlinear dynamics and chaos through the optomechanical back-action.","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202300417","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140614194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0