New Journal of Physics最新文献_第9页

Long-time properties of generic Floquet systems are approximately periodic with the driving period 一般 Floquet 系统的长期特性近似于周期性，其驱动周期为

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-16 DOI: 10.1088/1367-2630/ad5eb1

Yichen Huang (黄溢辰)

引用次数: 0

Nonequilibrium quantum heat transport between structured environments 结构环境之间的非平衡量子热传输

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-16 DOI: 10.1088/1367-2630/ad5bfb

Graeme Pleasance and Francesco Petruccione

{"title":"Nonequilibrium quantum heat transport between structured environments","authors":"Graeme Pleasance and Francesco Petruccione","doi":"10.1088/1367-2630/ad5bfb","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5bfb","url":null,"abstract":"We apply the hierarchical equations of motion technique to analyzing nonequilibrium heat transport in a spin-boson type model, whereby heat transfer through a central spin is mediated by an intermediate pair of coupled harmonic oscillators. The coupling between each pair of oscillators is shown to introduce a localized gap into the effective spectral densities characterizing the system–oscillator–reservoir interactions. Compared to the case of a single mediating oscillator, we find the heat current to be drastically modified at weak system-bath coupling. In particular, a second-order treatment fails to capture the correct steady-state behavior in this regime, which stems from the λ4-scaling of the energy transfer rate to lowest order in the coupling strength λ. This leads naturally to a strong suppression in the steady-state current in the asymptotically weak coupling limit. On the other hand, the current noise follows the same scaling as in the single oscillator case in accordance with the fluctuation-dissipation theorem. Additionally, we find the heat current to be consistent with Fourier’s law even at large temperature bias. Our analysis highlights a novel mechanism for controlling heat transport in nanoscale systems based on tailoring the spectral properties of thermal environments.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"92 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141719872","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

Constrained hidden Markov models reveal further Hsp90 protein states 受约束的隐马尔可夫模型进一步揭示了 Hsp90 蛋白的状态

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-14 DOI: 10.1088/1367-2630/ad5def

Riccardo Tancredi, Antonio Feltrin, Giosuè Sardo Infirri, Simone Toso, Leonie Vollmar, Thorsten Hugel and Marco Baiesi

{"title":"Constrained hidden Markov models reveal further Hsp90 protein states","authors":"Riccardo Tancredi, Antonio Feltrin, Giosuè Sardo Infirri, Simone Toso, Leonie Vollmar, Thorsten Hugel and Marco Baiesi","doi":"10.1088/1367-2630/ad5def","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5def","url":null,"abstract":"Time series of conformational dynamics in proteins are usually evaluated with hidden Markov models (HMMs). This approach works well if the number of states and their connectivity is known. However, for the multi-domain protein Hsp90, a standard HMM analysis with optimization of the BIC (Bayesian information criterion) cannot explain long-lived states well. Therefore, here we employ constrained HMMs, which neglect transitions between states by including assumptions. Gradually tuning a model with justified and focused changes allows us to improve its effectiveness and the score of the BIC. This became possible by analyzing time traces with several thousand observable transitions and, therefore, superb statistics. In this scheme, we also monitor the residences in the states reconstructed by the model, aiming to find exponentially distributed dwell times. We show how introducing new states can achieve these statistics but also point out limitations, e.g. for substantial similarity of two states connected to a common neighbor. One of the states displays the lowest free energy and could be the idle open ‘waiting state’, in which Hsp90 waits for the binding of nucleotides, cochaperones, or clients.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"48 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141719874","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

Gaussian quantum metrology for mode-encoded parameters 模式编码参数的高斯量子计量学

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-14 DOI: 10.1088/1367-2630/ad5eb2

Giacomo Sorelli, Manuel Gessner, Nicolas Treps and Mattia Walschaers

引用次数: 0

Collimated beam formation in 3D acoustic sonic crystals 三维声波晶体中的准直光束形成

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-11 DOI: 10.1088/1367-2630/ad5c94

A L Vanel, M Dubois, C Tronche, S Fu, Y-T Wang, G Dupont, A D Rakić, K Bertling, R Abdeddaim, S Enoch, R V Craster, G Li, S Guenneau and J Perchoux

{"title":"Collimated beam formation in 3D acoustic sonic crystals","authors":"A L Vanel, M Dubois, C Tronche, S Fu, Y-T Wang, G Dupont, A D Rakić, K Bertling, R Abdeddaim, S Enoch, R V Craster, G Li, S Guenneau and J Perchoux","doi":"10.1088/1367-2630/ad5c94","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5c94","url":null,"abstract":"We demonstrate strongly collimated beam formation, at audible frequencies, in a three-dimensional acoustic phononic crystal where the wavelength is commensurate with the crystal elements; the crystal is a seemingly simple rectangular cuboid constructed from closely-spaced spheres, and yet demonstrates rich wave phenomena acting as a canonical three-dimensional metamaterial. We employ theory, numerical simulation and experiments to design and interpret this collimated beam phenomenon and use a crystal consisting of a finite rectangular cuboid array of polymer spheres 1.38 cm in diameter in air, arranged in a primitive cubic cell with the centre-to-centre spacing of the spheres, i.e. the pitch, as 1.5 cm. Collimation effects are observed in the time domain for chirps with central frequencies at 14.2 kHz and 18 kHz, and we deployed a laser feedback interferometer or Self-Mixing Interferometer – a recently proposed technique to observe complex acoustic fields—that enables experimental visualisation of the pressure field both within the crystal and outside of the crystal. Numerical exploration using a higher-order multi-scale finite element method designed for the rapid and detailed simulation of 3D wave physics further confirms these collimation effects and cross-validates with the experiments. Interpretation follows using High Frequency Homogenization and Bloch analysis whereby the different origin of the collimation at these two frequencies is revealed by markedly different isofrequency surfaces of the sonic crystal.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"60 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141610150","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

Persistent and anti-persistent motion in bounded and unbounded space: resolution of the first-passage problem 有界和无界空间中的持久和反持久运动：解决第一通道问题

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-11 DOI: 10.1088/1367-2630/ad5d85

Daniel Marris and Luca Giuggioli

{"title":"Persistent and anti-persistent motion in bounded and unbounded space: resolution of the first-passage problem","authors":"Daniel Marris and Luca Giuggioli","doi":"10.1088/1367-2630/ad5d85","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5d85","url":null,"abstract":"The presence of temporal correlations in random movement trajectories is a widespread phenomenon across biological, chemical and physical systems. The ubiquity of persistent and anti-persistent motion in many natural and synthetic systems has led to a large literature on the modelling of temporally correlated movement paths. Despite the substantial body of work, little progress has been made to determine the dynamical properties of various transport related quantities, including the first-passage or first-hitting probability to one or multiple absorbing targets when space is bounded. To bridge this knowledge gap we generalise the renewal theory of first-passage and splitting probabilities to correlated discrete variables. We do so in arbitrary dimensions on a lattice for the so-called correlated or persistent random walk, the one step non-Markovian extension of the simple lattice random walk in bounded and unbounded space. We focus on bounded domains and consider both persistent and anti-persistent motion in hypercubic lattices as well as the hexagonal lattice. The discrete formalism allows us to extend the notion of the first-passage to that of the directional first-passage, whereby the walker must reach the target from a prescribed direction for a hitting event to occur. As an application to spatio-temporal observations of correlated moving cells that may be either repelled or attracted to hard surfaces, we compare the first-passage statistics to a target within a reflecting domain depending on whether an interaction with the reflective interface invokes a reversal of the movement direction or not. With strong persistence we observe multi-modality in the first-passage distribution in the former case, which instead is greatly suppressed in the latter.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"58 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141610152","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

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