New Journal of Physics最新文献_第9页

Influence of Gravitational Tilt on the Thermocapillary Convection in a Non-Axisymmetric Liquid Bridge 重力倾斜对非轴对称液桥中热毛细管对流的影响

New Journal of Physics Pub Date : 2024-02-02 DOI: 10.1088/1367-2630/ad25a7

Shuo Yang, Yupeng Zhang, Jie Cui, Daocheng Qin, Yuhang Wang, Pushi Ge, Jintao Luo, Duojiao Guan, Yunyi Zheng

{"title":"Influence of Gravitational Tilt on the Thermocapillary Convection in a Non-Axisymmetric Liquid Bridge","authors":"Shuo Yang, Yupeng Zhang, Jie Cui, Daocheng Qin, Yuhang Wang, Pushi Ge, Jintao Luo, Duojiao Guan, Yunyi Zheng","doi":"10.1088/1367-2630/ad25a7","DOIUrl":"https://doi.org/10.1088/1367-2630/ad25a7","url":null,"abstract":"\u0000 Fluid slosh caused by residual acceleration in microgravity is a common problem encountered in space engineering. To solve this problem, the ground-based experiment research on the influence of gravity jitter and gravitational tilt on the thermocapillary convection (TCC) transition behavior of non-axisymmetric liquid bridge has become an important issue in microgravity fluid management. Based on a mesoscale liquid bridge experimental platform which can realize gravitational tilt, the effect of gravitational tilt on TCC by using a high-speed camera equipped with a near-focus lens and a self-developed interface image recognition package. The results show that the spatio-temporal evolution of TCC by the influence of gravitational tilt is still divided into steady and oscillatory flow. In the stable TCC, the vortex core distortion of cellular flow caused by the imbalance left and right interface curvature invites cellular flow close to the free surface, and it shrinks to the intermediate height. As gravitational tilt increases, the transverse/longitudinal velocity peaks are significantly reduced, peak velocity has been reduced by 26-27%. Meanwhile, the longitudinal velocity gradient at the free interface increases significantly. Therefore, gravitational tilt plays an important role in improving the surface flow velocity. In the oscillatory TCC, the position of vortex core is closer to the free interface at the hot/cold corner as the periodic mutual occupation of the left and right cellular flows. The TCC is obviously inhibited due to the gravitational tilt. The critical temperature difference is increased by 25% and the onset of temperature oscillation at the hot corner is delayed by 20% compared with conventional gravity condition.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"113 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139810166","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

High key rate continuous-variable quantum key distribution using telecom optical components 利用电信光学元件实现高密钥速率连续可变量子密钥分发

New Journal of Physics Pub Date : 2024-01-05 DOI: 10.1088/1367-2630/ad1b7e

Tao Wang, Peng Huang, Lang Li, Yingming Zhou, Guihua Zeng

{"title":"High key rate continuous-variable quantum key distribution using telecom optical components","authors":"Tao Wang, Peng Huang, Lang Li, Yingming Zhou, Guihua Zeng","doi":"10.1088/1367-2630/ad1b7e","DOIUrl":"https://doi.org/10.1088/1367-2630/ad1b7e","url":null,"abstract":"\u0000 Quantum key distribution (QKD) is one quantum technology that can provide secure encryption keys for data transmission. The secret key rate is a core performance indicator in QKD, which directly determines the transmission rate of enciphered data. Here, for the first time, we demonstrate a high-key-rate Gaussian-modulated continuous-variable QKD (CV-QKD) using telecom optical components. The framework of CV-QKD over these components is constructed. Specifically, the high-rate low-noise Gaussian modulation of coherent states is realized by a classical optical IQ modulator. High-baud low-intensity quantum signals are received by an integrated coherent receiver under the shot-noise limit. A series of digital signal processing algorithms are proposed to achieve accurate signal recovery and key distillation. The system can yield a high asymptotic secret key rate of 10.37 Mbps within 20 km standard telecom fiber, and the secure distance can exceed 100 km. This result confirms the feasibility of CV-QKD with state-of-the-art performance using telecom optical components. Besides, due to the ease of integrating these discrete components, it provides a high-performance and miniaturized QKD solution for the metropolitan quantum network.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"27 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139383680","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

Characterizing quantum gases in time-controlled disorder realizations using cross-correlations of density distributions 利用密度分布的交叉相关性表征时控无序实现中的量子气体

New Journal of Physics Pub Date : 2024-01-05 DOI: 10.1088/1367-2630/ad1b82

Silvia Hiebel, Benjamin Nagler, Sian Barbosa, Jennifer Koch, Artur Widera

{"title":"Characterizing quantum gases in time-controlled disorder realizations using cross-correlations of density distributions","authors":"Silvia Hiebel, Benjamin Nagler, Sian Barbosa, Jennifer Koch, Artur Widera","doi":"10.1088/1367-2630/ad1b82","DOIUrl":"https://doi.org/10.1088/1367-2630/ad1b82","url":null,"abstract":"\u0000 The role of disorder on physical systems has been widely studied in the macroscopic and microscopic world. While static disorder is well understood in many cases, the impact of time-dependent disorder on quantum gases is still poorly investigated. In our experimental setup, we introduce and characterize a method capable of producing time-controlled optical-speckle disorder. Experimentally, coherent light illuminates a combination of a static and a rotating diffuser, thereby collecting a spatially varying phase due to the diffusers’ structure and a temporally variable phase due to the relative rotation. Controlling the rotation of the diffuser allows changing the speckle realization or, for future work, the characteristic time scale of the change of the speckle pattern, i.e., the correlation time, matching typical time scales of the quantum gases investigated. We characterize the speckle pattern ex-situ by measuring its intensity distribution cross-correlating different intensity patterns. In- situ, we observe its impact on a molecular Bose-Einstein condensate (BEC) and cross- correlate the density distributions of BECs probed in different speckle realizations. As one diffuser rotates relative to the other around the common optical axis, we trace the optical speckle’s intensity cross-correlations and the quantum gas’ density cross- correlations. Our results show comparable outcomes for both measurement methods. The setup allows us to tune the disorder potential adapted to the characteristics of the quantum gas. These studies pave the way for investigating nonequilibrium physics in interacting quantum gases using controlled dynamical-disorder potentials.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"42 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139381780","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

A collective perception model for neighbor selection in groups based on visual attention mechanisms 基于视觉注意力机制的群体邻居选择集体感知模型

New Journal of Physics Pub Date : 2024-01-05 DOI: 10.1088/1367-2630/ad1b81

kang li, Liang Li, Roderich Groß, S. Zhao

{"title":"A collective perception model for neighbor selection in groups based on visual attention mechanisms","authors":"kang li, Liang Li, Roderich Groß, S. Zhao","doi":"10.1088/1367-2630/ad1b81","DOIUrl":"https://doi.org/10.1088/1367-2630/ad1b81","url":null,"abstract":"\u0000 How each individual selects others within a group to interact with based on visual perception is a fundamental process underlying various collective motion behaviors. This process, however, remains poorly understood theoretically so far, partially due to the challenges of modeling neurological perception systems. Here, the classic zoom-lens visual attention model is introduced into collective perception, leading to a simple attention-based model that merely has a single parameter. Numerical experiments reveal that the proposed model oﬀers a uniﬁed mechanism for collective perception, as reﬂected in three aspects. First, this model describes both conspeciﬁc (e.g., ﬂocking) and heterospeciﬁc (e.g., predator-prey) collective behaviors. Second, this model uniﬁes the well-known topological and visibility models in the context of neighbor selection in conspeciﬁc groups. Third, in the context of prey selection in heterospeciﬁc groups, the model can simultaneously replicate the well-known confusion and oddity eﬀects. All these suggest the fundamental roles of visual attention underlying a diverse array of collective motion behaviors.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"40 47","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139382365","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

Information Cascade Prediction of complex networks based on Physics-informed Graph Convolutional Network 基于物理信息图卷积网络的复杂网络信息级联预测

New Journal of Physics Pub Date : 2024-01-04 DOI: 10.1088/1367-2630/ad1b29

Dingguo Yu, Yijie Zhou, Suiyu Zhang, Wenbing Li, Michael Small, Keke Shang

{"title":"Information Cascade Prediction of complex networks based on Physics-informed Graph Convolutional Network","authors":"Dingguo Yu, Yijie Zhou, Suiyu Zhang, Wenbing Li, Michael Small, Keke Shang","doi":"10.1088/1367-2630/ad1b29","DOIUrl":"https://doi.org/10.1088/1367-2630/ad1b29","url":null,"abstract":"\u0000 Cascade prediction aims to estimate the popularity of information diffusion in complex networks, which is beneficial to many applications from identifying viral marketing to fake news propagation in social media, estimating the scientific impact (citations) of a new publication, and so on. How to effectively predict cascade growth size has become a significant problem. Most previous methods based on deep learning have achieved remarkable results, while concentrating on mining structural and temporal features from diffusion networks and propagation paths. Whereas, the ignorance of spread dynamic information restricts the improvement of prediction performance. In this paper, we propose a novel framework called Physics-informed graph convolutional network (PiGCN) for cascade prediction, which combines explicit features (structural and temporal features) and propagation dynamic status in learning diffusion ability of cascades. Specifically, PiGCN is an end-to-end predictor, firstly splitting a given cascade into sub-cascade graph sequence and learning local structures of each sub-cascade via graph convolutional network (GCN), then adopting multi-layer perceptron (MLP) to predict the cascade growth size. Moreover, our dynamic neural network, combining PDE-like equations and a deep learning method, is designed to extract potential dynamics of cascade diffusion, which captures dynamic evolution rate both on structural and temporal changes. To evaluate the performance of our proposed PiGCN model, we have conducted extensive experiment on two well-known large-scale datasets from Sina Weibo and ArXIv subject listing HEP-PH to verify the effectiveness of our model. The results of our proposed model outperform the mainstream model, and show that dynamic features have great significance for cascade size prediction.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"13 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139386598","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

High-fidelity quantum gates via optimizing short pulse sequences in three-level systems 通过优化三级系统中的短脉冲序列实现高保真量子门

New Journal of Physics Pub Date : 2024-01-03 DOI: 10.1088/1367-2630/ad1a2a

Cheng Zhang, Yang Liu, Jie Song, Yan Xia, Z. Shi

引用次数: 0

Nonlinear Squeezing of Stochastic Motion 随机运动的非线性挤压

New Journal of Physics Pub Date : 2024-01-03 DOI: 10.1088/1367-2630/ad1a2c

L. Ornigotti, Darren W. Moore, Radim Filip

引用次数: 0

Wave beams, packets and pulses in inhomogeneous non-Hermitian media with dispersive gain or damping 具有色散增益或阻尼的非均质非赫米提介质中的波束、波包和脉冲

New Journal of Physics Pub Date : 2024-01-02 DOI: 10.1088/1367-2630/ad19fc

Emanuele Poli, Alberto Bottino, David Korger, O. Maj, Francesco Palermo, H. Weber

{"title":"Wave beams, packets and pulses in inhomogeneous non-Hermitian media with dispersive gain or damping","authors":"Emanuele Poli, Alberto Bottino, David Korger, O. Maj, Francesco Palermo, H. Weber","doi":"10.1088/1367-2630/ad19fc","DOIUrl":"https://doi.org/10.1088/1367-2630/ad19fc","url":null,"abstract":"\u0000 Wave beams, packets or pulses are known to be subject to a drift if the properties of the medium change across their extension. This effect is often analyzed considering the dispersive properties of the oscillation, related to the real part of the dispersion relation. The evolution of Gaussian beams/packets/pulses in nonuniform media in the presence of gain or damping is investigated in detail, with particular emphasis on the role of dispersion on both the real and the imaginary part of the dispersion relation. In the paraxial limit, the influence of a non-Hermitian medium on the evolution of the wave can be treated employing the equations derived by E.~M. Graefe and R.~Schubert in the frame of non-Hermitian quantum mechanics [Phys.~Rev.~A 83, 060101(R)]. Analytic solutions of the corresponding paraxial equations are obtained here for a one-dimensional complex dispersion relation characterized by a linear or quadratic dependence on the transverse coordinate (a space coordinate for beams and packets, the time in the co-moving frame for a pulse). In the presence of a constant gradient in both the real and the imaginary part of the dispersion relation, the contribution of the latter can lead to a faster or slower propagation with respect to the Hermitian case, depending on the parameters. In focusing media, a constant gain can counteract dispersive or inhomogeneous damping producing packets of asymptotically constant shape. The analytic formulas derived in this paper offer a way to predict or control the properties of beams/packets/pulses depending on their initial conditions and on the characteristics of the medium.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"118 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139390914","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

Quantifying the intrinsic randomness in sequential measurements 量化连续测量的内在随机性

New Journal of Physics Pub Date : 2024-01-02 DOI: 10.1088/1367-2630/ad19fe

Xinjian Liu, Yukun Wang, Yunguang Han, Xia Wu

{"title":"Quantifying the intrinsic randomness in sequential measurements","authors":"Xinjian Liu, Yukun Wang, Yunguang Han, Xia Wu","doi":"10.1088/1367-2630/ad19fe","DOIUrl":"https://doi.org/10.1088/1367-2630/ad19fe","url":null,"abstract":"\u0000 In the standard Bell scenario, when making a local projective measurement on each system component, the amount of randomness generated is restricted. However, this limitation can be surpassed through the implementation of sequential measurements. Nonetheless, a rigorous definition of random numbers in the context of sequential measurements is yet to be established, except for the lower quantification in device-independent scenarios. In this paper, we provide the definition of quantum intrinsic randomness in sequential measurements and quantify the randomness in the Collins-Gisin-Linden-Massar-Popescu (CGLMP) inequality sequential scenario. Initially, we investigate the quantum intrinsic randomness of the mixed states under sequential projective measurements and the intrinsic randomness of the sequential non-projective measurements under pure states. Naturally, we rigorously define quantum intrinsic randomness under sequential non-projective measurement for arbitrary quantum states. Furthermore, we apply our method to one-Alice and two-Bobs sequential measurement scenarios and quantify the quantum intrinsic randomness of the maximally entangled state and maximally violated state by giving an extremal decomposition. Finally, using the sequential NPA hierarchy in the device-independent scenario, we derive lower bounds on the quantum intrinsic randomness of the maximally entangled state and maximally violated state.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"118 46","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139390891","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

Inverse engineering for robust state transport along a spin chain via low-energy subspaces 通过低能子空间沿自旋链进行稳健状态传输的逆工程学

New Journal of Physics Pub Date : 2024-01-02 DOI: 10.1088/1367-2630/ad19fd

Yunlan Ji, Ze Wu, Ran Liu, Yuchen Li, Fangzhou Jin, Hui Zhou, Xinhua Peng

引用次数: 0