New Journal of Physics最新文献_第9页

Distinguishing the topological charge of vortex beam via Fourier back plane imaging with chiral windmill structure 通过手性风车结构的傅立叶背平面成像区分涡束的拓扑电荷

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-10 DOI: 10.1088/1367-2630/ad5df0

Yangzhe Guo, Jing Li and Yurui Fang

{"title":"Distinguishing the topological charge of vortex beam via Fourier back plane imaging with chiral windmill structure","authors":"Yangzhe Guo, Jing Li and Yurui Fang","doi":"10.1088/1367-2630/ad5df0","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5df0","url":null,"abstract":"In recent years, research on the interaction between orbital angular momentum (OAM) of light and matter has shown a continuous influx of investigations. OAM possesses distinct properties, such as a degree of freedom with multiple states, vortex characteristics, and topological properties, which expand its applications in optical communication, optical sensing, and optical manipulation. We have observed different phenomena in the chiral metal windmill structure under excitation of spin angular momentum (SAM)-OAM beam generated by Q-plate than under SAM excitation. Fourier back focal plane (FBP) imaging under SAM beam excitation easily identifies the chirality and geometric properties of the structure. When the SAM-OAM beam excites the structure, FBP not only identifies its chirality and geometric properties but also distinguishes different OAM topological charges and signs, as well as the degree of elliptic polarization. The Stokes parametric FBP imaging reveals asymmetric polarization distribution resulting from the interaction between a vortex beam and the chiral structure. Moreover, it clearly reflects the conversion process of SAM to OAM. The experimental results match well with simulation results. These findings hold valuable insights for the advancement of optical information storage and communication using OAM, opening up new possibilities for further exploration in this field.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"18 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141585943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Quantum-enhanced joint estimation of phase and phase diffusion 量子增强的相位和相位扩散联合估计

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-10 DOI: 10.1088/1367-2630/ad5eb0

Jayanth Jayakumar, Monika E Mycroft, Marco Barbieri and Magdalena Stobińska

引用次数: 0

Optimal depth and a novel approach to variational unitary quantum process tomography 变异单元量子过程层析的最佳深度和新方法

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-10 DOI: 10.1088/1367-2630/ad5df1

Vladlen Galetsky, Pol Julià Farré, Soham Ghosh, Christian Deppe and Roberto Ferrara

{"title":"Optimal depth and a novel approach to variational unitary quantum process tomography","authors":"Vladlen Galetsky, Pol Julià Farré, Soham Ghosh, Christian Deppe and Roberto Ferrara","doi":"10.1088/1367-2630/ad5df1","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5df1","url":null,"abstract":"In this work, we present two new methods for variational quantum circuit (VQC) process tomography (PT) onto n qubits systems: unitary PT based on VQCs (PT_VQC) and unitary evolution-based variational quantum singular value decomposition (U-VQSVD). Compared to the state of the art, PT_VQC halves in each run the required amount of qubits for unitary PT and decreases the required state initializations from 4n to just 2n, all while ensuring high-fidelity reconstruction of the targeted unitary channel U. It is worth noting that, for a fixed reconstruction accuracy, PT_VQC achieves faster convergence per iteration step compared to quantum deep neural network and tensor network schemes. The novel U-VQSVD algorithm utilizes variational singular value decomposition to extract eigenvectors (up to a global phase) and their associated eigenvalues from an unknown unitary representing a universal channel. We assess the performance of U-VQSVD by executing an attack on a non-unitary channel quantum physical unclonable function. By using U-VQSVD we outperform an uninformed impersonation attack (using randomly generated input states) by a factor of 2 to 5, depending on the qubit dimension. For the two presented methods, we propose a new approach to calculate the complexity of the displayed VQC, based on what we denote as optimal depth.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"17 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141586282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Double diffraction imaging of x-ray induced structural dynamics in single free nanoparticles X 射线诱导单个自由纳米粒子结构动态的双重衍射成像

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-10 DOI: 10.1088/1367-2630/ad5d84

M Sauppe, T Bischoff, C Bomme, C Bostedt, A Colombo, B Erk, T Feigl, L Flückiger, T Gorkhover, A Heilrath, K Kolatzki, Y Kumagai, B Langbehn, J P Müller, C Passow, D Ramm, D Rolles, D Rompotis, J Schäfer-Zimmermann, B Senfftleben, R Treusch, A Ulmer, J Zimbalski, T Möller and D Rupp

{"title":"Double diffraction imaging of x-ray induced structural dynamics in single free nanoparticles","authors":"M Sauppe, T Bischoff, C Bomme, C Bostedt, A Colombo, B Erk, T Feigl, L Flückiger, T Gorkhover, A Heilrath, K Kolatzki, Y Kumagai, B Langbehn, J P Müller, C Passow, D Ramm, D Rolles, D Rompotis, J Schäfer-Zimmermann, B Senfftleben, R Treusch, A Ulmer, J Zimbalski, T Möller and D Rupp","doi":"10.1088/1367-2630/ad5d84","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5d84","url":null,"abstract":"Because of their high photon flux, x-ray free-electron lasers (FEL) allow to resolve the structure of individual nanoparticles via coherent diffractive imaging (CDI) within a single x-ray pulse. Since the inevitable rapid destruction of the sample limits the achievable resolution, a thorough understanding of the spatiotemporal evolution of matter on the nanoscale following the irradiation is crucial. We present a technique to track x-ray induced structural changes in time and space by recording two consecutive diffraction patterns of the same single, free-flying nanoparticle, acquired separately on two large-area detectors opposite to each other, thus examining both the initial and evolved particle structure. We demonstrate the method at the extreme ultraviolet (XUV) and soft x-ray Free-electron LASer in Hamburg (FLASH), investigating xenon clusters as model systems. By splitting a single XUV pulse, two diffraction patterns from the same particle can be obtained. For focus intensities of about W cm−2 we observe still largely intact clusters even at the longest delays of up to 650 picoseconds of the second pulse, indicating that in the highly absorbing systems the damage remains confined to one side of the cluster. Instead, in case of five times higher flux, the diffraction patterns show clear signatures of disintegration, namely increased diameters and density fluctuations in the fragmenting clusters. Future improvements to the accessible range of dynamics and time resolution of the approach are discussed.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"78 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141585717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Shell-model study of 58Ni using quantum computing algorithm 利用量子计算算法对 58Ni 进行壳模型研究

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-09 DOI: 10.1088/1367-2630/ad5756

Bharti Bhoy, Paul Stevenson

引用次数: 0

Connecting quantum cities: simulation of a satellite-based quantum network 连接量子城市：模拟基于卫星的量子网络

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-09 DOI: 10.1088/1367-2630/ad5b13

Raja Yehia, Matteo Schiavon, Valentina Marulanda Acosta, Tim Coopmans, Iordanis Kerenidis, David Elkouss, Eleni Diamanti

引用次数: 0

Unconventional edge states in a two-leg ladder 双腿阶梯中的非常规边缘状态

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-08 DOI: 10.1088/1367-2630/ad5bf9

C A Downing, L Martín-Moreno, O I R Fox

{"title":"Unconventional edge states in a two-leg ladder","authors":"C A Downing, L Martín-Moreno, O I R Fox","doi":"10.1088/1367-2630/ad5bf9","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5bf9","url":null,"abstract":"Some popular mechanisms for restricting the diffusion of waves include introducing disorder (to provoke Anderson localization) and engineering topologically non-trivial phases (to allow for topological edge states to form). However, other methods for inducing somewhat localized states in elementary lattice models have been historically much less studied. Here we show how edge states can emerge within a simple two-leg ladder of coupled harmonic oscillators, where it is important to include interactions beyond those at the nearest neighbor range. Remarkably, depending upon the interplay between the coupling strength along the rungs of the ladder and the next-nearest neighbor coupling strength along one side of the ladder, edge states can indeed appear at particular energies. In a wonderful manifestation of a type of bulk-edge correspondence, these edge state energies correspond to the quantum number for which additional stationary points appear in the continuum bandstructure of the equivalent problem studied with periodic boundary conditions. Our theoretical results are relevant to a swathe of classical or quantum lattice model simulators, such that the proposed edge states may be useful for applications including waveguiding in metamaterials and quantum transport.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"46 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141568046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Role of blue-shift length in macroscopic properties of high-harmonic generation 蓝移长度在高次谐波生成宏观特性中的作用

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-08 DOI: 10.1088/1367-2630/ad5bfa

Margarita Khokhlova, Vasily Strelkov

{"title":"Role of blue-shift length in macroscopic properties of high-harmonic generation","authors":"Margarita Khokhlova, Vasily Strelkov","doi":"10.1088/1367-2630/ad5bfa","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5bfa","url":null,"abstract":"The production of brighter coherent XUV radiation by intense laser pulses through the process of high-harmonic generation (HHG) is one of the central challenges in contemporary nonlinear optics. We study the generation and spatial propagation of high harmonics analytically and via <italic toggle=\"yes\">ab initio</italic> simulations. We focus on the length scales defining the growth of the harmonic signal with propagation distance and show that the well-known coherence length limits HHG only for relatively low driving intensities. For higher intensities, the photoionisation of the medium, naturally accompanying HHG, leads to essentially transient phase matching and laser frequency blue shift. By systematically taking both of these factors into account, we demonstrate that the behaviour of the harmonic signal at higher intensities is defined by another length scale—the blue-shift length. In this generation regime the XUV intensity at a given frequency first grows quadratically and then saturates passing the blue-shift length, but the total harmonic efficiency continues growing linearly due to the linear increase of the harmonic line bandwidth. The changeover to this generation regime takes place for all harmonic orders roughly simultaneously. The rate of the efficiency growth is maximal if the atomic dispersion is compensated by photoelectrons near the centre of the laser pulse. Our theory offers a robust way to choose the generation conditions that optimise the growth of the harmonic signal with propagation.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"25 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141568104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Competing interactions in strongly driven multi-level systems 强驱动多级系统中相互竞争的相互作用

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-04 DOI: 10.1088/1367-2630/ad5a32

Jana Bender, Patrick Mischke, Tanita Klas, Florian Binoth, Hani Naim, Herwig Ott and Thomas Niederprüm

引用次数: 0

Topological boundary modes in nonlinear dynamics with chiral symmetry 具有手性对称性的非线性动力学中的拓扑边界模式

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-03 DOI: 10.1088/1367-2630/ad5b14

Di Zhou

引用次数: 0