Science China Physics, Mechanics & Astronomy最新文献_第2页

Port-controllable routing of orbital angular momentum modes using a rotatable diffractive neural network 使用可旋转衍射神经网络的轨道角动量模式端口可控路由

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-04-18 DOI: 10.1007/s11433-024-2637-4

Junmin Liu, Jiafu Chen, Qingji Zeng, Zemin Liang, Xinping Wu, Xin Zhao, Jiangnan Xiao, Huapeng Ye, Ze Dong, Dianyuan Fan, Shuqing Chen

{"title":"Port-controllable routing of orbital angular momentum modes using a rotatable diffractive neural network","authors":"Junmin Liu, Jiafu Chen, Qingji Zeng, Zemin Liang, Xinping Wu, Xin Zhao, Jiangnan Xiao, Huapeng Ye, Ze Dong, Dianyuan Fan, Shuqing Chen","doi":"10.1007/s11433-024-2637-4","DOIUrl":"10.1007/s11433-024-2637-4","url":null,"abstract":"<div><p>Orbital angular momentum (OAM) modes provide an additional orthogonal physical dimension, offering transformative potential for enhancing optical communication capacity. Despite significant progress in mode multiplexing, the development of robust communication networks faces persistent challenges, particularly in effectively routing and controlling these multiplexed channels among network nodes. To tackle these dilemmas, we propose a rotatable diffractive neural network (R-DNN) strategy and demonstrate its capability for port-controllable OAM mode routing. By leveraging the correlation between the orthogonal evolution of OAM modes in free space and phase modulations during propagation, the R-DNN precisely shapes the spatial evolution of mode fields through multiple rotatable phase layers, enabling efficient routing to specific output ports. This approach exploits the interaction of secondary wavelets with the relative states of the rotatable layers, allowing on-demand control of mode evolution paths and enhancing routing flexibility. As a proof of concept, we developed a tri-functional router that successfully directs three OAM modes to individually controllable output ports. This router achieves an average intermode crosstalk of less than −16.4 dB across three functional states, one-dimensional, two-dimensional, and cross-connected switching, while supporting the routing of 5.85 Tbit/s quadrature phase-shift keying signals. These results highlight the R-DNN’s effectiveness in achieving precise and controllable OAM mode manipulation, paving the way for advanced applications in mode-multiplexed communication networks and beyond.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 6","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Isolating and identification of layer dependence of correlated states in MoSe2/WS2 moiré heterojunction MoSe2/WS2 moirir异质结中相关态层依赖性的分离与鉴定

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-04-18 DOI: 10.1007/s11433-025-2624-4

Yuze Meng, Zenghui Wang

{"title":"Isolating and identification of layer dependence of correlated states in MoSe2/WS2 moiré heterojunction","authors":"Yuze Meng, Zenghui Wang","doi":"10.1007/s11433-025-2624-4","DOIUrl":"10.1007/s11433-025-2624-4","url":null,"abstract":"<div><p>The emergence of two-dimensional moiré superlattice has sparked intense research interest thanks to its rich correlated physics. Compared with graphene-based systems, moiré superlattices based on transitional metal dichalcogenides facilitate better access to such physical phenomena, with higher transition temperatures, more robust flat bands, and richer correlated states. However, the layer degree freedom in certain heterojunctions has remained largely unexplored due to various technical challenges. In this work, by excluding the effect of the moiré angle through a designed sample structure, we isolate, identify, and investigate the layer dependence in an MoSe<sub>2</sub>/WS<sub>2</sub> moiré heterojunction, and observe striking contrasts between samples with different numbers of layers. In the monolayer MoSe<sub>2</sub>/monolayer WS<sub>2</sub> moiré heterojunction, we observe an unusual alternation in the spectroscopic features of the correlated states, revealing competition between polaron and exciton dominances. In bilayer MoSe<sub>2</sub>/monolayer WS<sub>2</sub> moiré heterojunction, we observe a clear signature oflayer-modulated moiré excitons, which we further use a probe to reveal the electric field tuning of the correlated states. Our study demonstrates the intriguing opportunities offered by the MoSe<sub>2</sub>/WS<sub>2</sub> moiré heterojunction as an exciting playground for exploring many-body physics and engineering emerging quantum states.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 6","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 search algorithm for continuous domains 连续域的量子搜索算法

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-04-18 DOI: 10.1007/s11433-025-2654-2

Lvzhou Li

引用次数: 0

Resource-optimized VQE implementation: Bridging algorithmic innovation and hardware realities 资源优化的VQE实现：连接算法创新和硬件现实

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-04-15 DOI: 10.1007/s11433-025-2651-5

Li-Wei Yu

引用次数: 0

The treasures in the backyard—A bright binary revealed as potential progenitor of a neutron star 后院的宝藏--明亮双星被揭示为中子星的潜在祖先

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-04-15 DOI: 10.1007/s11433-025-2650-8

Stephan Geier

引用次数: 0

Quantum frontiers in high energy physics 高能物理中的量子前沿

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-04-15 DOI: 10.1007/s11433-024-2635-4

Yaquan Fang, Christina Gao, Ying-Ying Li, Jing Shu, Yusheng Wu, Hongxi Xing, Bin Xu, Lailin Xu, Chen Zhou

引用次数: 0

Dynamics of holographic steady flows near a first-order phase transition 一阶相变附近全息稳定流动的动力学

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-04-15 DOI: 10.1007/s11433-025-2633-y

Qian Chen, Yuxuan Liu, Yu Tian, Xiaoning Wu, Hongbao Zhang

{"title":"Dynamics of holographic steady flows near a first-order phase transition","authors":"Qian Chen, Yuxuan Liu, Yu Tian, Xiaoning Wu, Hongbao Zhang","doi":"10.1007/s11433-025-2633-y","DOIUrl":"10.1007/s11433-025-2633-y","url":null,"abstract":"<div><p>We investigate the physical properties of steady flows in a holographic first-order phase transition model, extending from the thermodynamics at equilibrium to the real-time dynamics far from equilibrium. Through spinodal decomposition or condensation nuclei, the phase-separated state with non-zero momentum can be achieved. In this scenario, we observe a gap between coexisting phases, arising not only from the variations in energy density, but also from the distinctions in momentum density or longitudinal pressure. These disparities are characterized by flow velocity and latent heat. Furthermore, by introducing an inhomogeneous scalar external source to simulate a fixed obstacle, we reveal the dynamical response of momentum loss in the moving system. Notably, starting from an initial phase-separated state with uniform flow velocity, and subsequently interacting it with an obstacle, we find that the moving high-energy phase exhibits four characteristic dynamical behaviors—rebounding, pinning, passing, and splitting. These behaviors depend on the velocity of the phase and the strength of the obstacle.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 6","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

The neutron transport equation in exact differential form 精确微分形式的中子输运方程

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-04-15 DOI: 10.1007/s11433-024-2642-3

Dong Liu, Yang Liu, Haoning Dang, Kai Wang, Bin Zhang, Fei Wang, Zhouyu Liu, Yong Jiang

{"title":"The neutron transport equation in exact differential form","authors":"Dong Liu, Yang Liu, Haoning Dang, Kai Wang, Bin Zhang, Fei Wang, Zhouyu Liu, Yong Jiang","doi":"10.1007/s11433-024-2642-3","DOIUrl":"10.1007/s11433-024-2642-3","url":null,"abstract":"<div><p>Derived from the Boltzmann equation, the neutron transport equation describes the motions and interactions of neutrons with nuclei in nuclear devices such as nuclear reactors. The collision or fission effect are described as integral terms which arrive in an integro-differential neutron transport equation (IDNT). Only for mono-material or simple geometries conditions, elegant approximation can simplify the transport equation to provide analytic solutions. To solve this integro-differential equation becomes a practical engineering challenge. Recent development of deep-learning techniques provides a new approach to solve them but for some complicated conditions, it is also time consuming. To optimize solving the integro-differential equation particularly under the deep-learning method, we propose to convert the integral terms in the integro-differential neutron transport equation into their corresponding antiderivatives, providing a set of fixed solution constraint conditions for these antiderivatives, thus yielding an exact differential neutron transport equation (EDNT). The paper elucidates the physical meaning of the antiderivatives and analyzes the continuity and computational complexity of the new transport equation form. To illustrate the significant advantage of ENDT, numerical validations have been conducted using various numerical methods on typical benchmark problems. The numerical experiments demonstrate that the EDNT is compatible with various numerical methods, including the finite difference method (FDM), finite volume method (FVM), and PINN. Compared to the IDNT, the EDNT offers significant efficiency advantages, with reductions in computational time ranging from several times to several orders of magnitude. This EDNT approach may also be applicable for other integro-differential transport theories such as radiative energy transport and has potential application in astrophysics or other fields.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 7","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Experimental implementation of a qubit-efficient variational quantum eigensolver with analog error mitigation on a superconducting quantum processor 超导量子处理器上模拟误差降低的量子比特高效变分量子特征解算器的实验实现

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-04-15 DOI: 10.1007/s11433-025-2620-6

Yuwei Ma, Weiting Wang, Xianghao Mu, Weizhou Cai, Ziyue Hua, Xiaoxuan Pan, Dong-Ling Deng, Rebing Wu, Chang-Ling Zou, Lei Wang, Luyan Sun

{"title":"Experimental implementation of a qubit-efficient variational quantum eigensolver with analog error mitigation on a superconducting quantum processor","authors":"Yuwei Ma, Weiting Wang, Xianghao Mu, Weizhou Cai, Ziyue Hua, Xiaoxuan Pan, Dong-Ling Deng, Rebing Wu, Chang-Ling Zou, Lei Wang, Luyan Sun","doi":"10.1007/s11433-025-2620-6","DOIUrl":"10.1007/s11433-025-2620-6","url":null,"abstract":"<div><p>We experimentally demonstrate a qubit-efficient variational quantum eigensolver (VQE) algorithm using a superconducting quantum processor, employing minimal quantum resources with only a transmon qubit coupled to a high-coherence photonic qubit. By leveraging matrix product states to compress the quantum state representation, we simulate an <i>N</i> + 1-spin circular Ising model with a transverse field. Furthermore, we develop an analog error mitigation approach through zero-noise extrapolation by introducing a precise noise injection technique for the transmon qubit. As a validation, we apply our error-mitigated qubit-efficient VQE in determining the ground state energies of a 4-spin Ising model. Our results demonstrate the feasibility of performing quantum algorithms with minimal quantum resources while effectively mitigating the impact of noise, offering a promising pathway to bridge the gap between theoretical advances and practical implementations on current noisy intermediate-scale quantum devices.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 7","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

LHAASO view of the Milky Way LHAASO对银河系的看法

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-04-11 DOI: 10.1007/s11433-025-2638-5

Elena Amato

引用次数: 0