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

Nonlinear optical oscillation in on-chip erbium-doped lithium niobate microring resonators

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-18 DOI: 10.1007/s11433-024-2591-x

Ru Zhang, Xianhong Zeng, Xueshan Zheng, Chen Yang, Dahuai Zheng, Hongde Liu, Xuanyi Yu, Feng Gao, Fang Bo, Yongfa Kong, Guoquan Zhang, Jingjun Xu

{"title":"Nonlinear optical oscillation in on-chip erbium-doped lithium niobate microring resonators","authors":"Ru Zhang, Xianhong Zeng, Xueshan Zheng, Chen Yang, Dahuai Zheng, Hongde Liu, Xuanyi Yu, Feng Gao, Fang Bo, Yongfa Kong, Guoquan Zhang, Jingjun Xu","doi":"10.1007/s11433-024-2591-x","DOIUrl":"10.1007/s11433-024-2591-x","url":null,"abstract":"<div><p>Erbium-doped lithium niobate (LN) on insulator active devices, such as lasers and amplifiers, have received increasing attention. The nonlinear optical oscillation in them at high power destabilizes the output of signals and cannot be ignored. In this study, we reported the experimental observation and theoretical analysis of the nonlinear optical oscillation in erbium-doped lithium niobate-on-insulator (LNOI) microring resonators while scanning the pump wavelength. Under the same pump power, the number of oscillation cycles decreases when the wavelength scanning rate increases from 10.6 to 33.9 nm/µs. A theoretical model based on the competition between the thermo-optic nonlinearity and the photorefractive effect was introduced to interpret the oscillation in transmission. A series of parameters were obtained from the comparison between the theoretical and experimental results; some of them, the relaxation rates of the thermal and the electric field, are significantly different from those of undoped LNOI microcavities. This work provides a valuable reference for future applications of active LNOI devices.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455629","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

Eigen microstate analysis unveils climate dynamics

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-18 DOI: 10.1007/s11433-024-2586-2

Hua Tu, Shang Wang, Jun Meng, Yongwen Zhang, Xiaosong Chen, Deliang Chen, Jingfang Fan

{"title":"Eigen microstate analysis unveils climate dynamics","authors":"Hua Tu, Shang Wang, Jun Meng, Yongwen Zhang, Xiaosong Chen, Deliang Chen, Jingfang Fan","doi":"10.1007/s11433-024-2586-2","DOIUrl":"10.1007/s11433-024-2586-2","url":null,"abstract":"<div><p>The Earth’s climate operates as a complex, dynamically interconnected system, driven by both anthropogenic and natural forcings and modulated by nonlinear interactions and feedback loops. This study employs a theoretical framework and the Eigen Microstate (EM) approach of statistical physics to examine global surface temperature variations since 1948, as revealed by a global reanalysis. We identified EMs significantly correlated with key climate phenomena such as the global monsoon system, tropical climates, and El Niño. Our analysis reveals that these EMs have increasingly influenced global surface temperature variations over recent decades, highlighting the critical roles of hemispheric differences, land-sea contrasts, and tropical climate fluctuations in a warming world. Additionally, we used model simulations from more than 10 Coupled Model Intercomparison Project Phase 6 (CMIP6) under three future climate scenarios to perform a comparative analysis of the changes in each EM contribution. The results indicate that under future warming scenarios, tropical climate fluctuations will become increasingly dominant, while traditional hemispheric and monsoonal patterns may decline. This shift underscores the importance of understanding tropical dynamics and their impact on global climate from a physics-based perspective. Our study provides a new perspective on understanding and addressing global climate change, enhancing the theoretical foundation of this critical field, and yielding findings with significant practical implications for improving climate models and developing effective mitigation and adaptation strategies.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455557","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

Fermiology with nodal structures in nonsymmorphic superconductor LaNiGa2: A de Haas-van Alphen study

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-18 DOI: 10.1007/s11433-024-2559-x

Houpu Li, Ye Yang, Mengzhu Shi, Yingcai Qian, Senyang Pan, Kaibao Fan, Nan Zhang, Kaixin Tang, Hongyu Li, Zhiwei Wang, Jinglei Zhang, Chuanying Xi, Ziji Xiang, Xianhui Chen

{"title":"Fermiology with nodal structures in nonsymmorphic superconductor LaNiGa2: A de Haas-van Alphen study","authors":"Houpu Li, Ye Yang, Mengzhu Shi, Yingcai Qian, Senyang Pan, Kaibao Fan, Nan Zhang, Kaixin Tang, Hongyu Li, Zhiwei Wang, Jinglei Zhang, Chuanying Xi, Ziji Xiang, Xianhui Chen","doi":"10.1007/s11433-024-2559-x","DOIUrl":"10.1007/s11433-024-2559-x","url":null,"abstract":"<div><p>Topological metals possess various types of symmetry-protected degenerate band crossings. When a topological metal becomes superconducting, the low-energy electronic excitations stemming from the band crossings located close to the Fermi level may contribute to highly unusual pairing symmetry and superconducting states. In this work, we study the electronic band structure of the time-reversal symmetry breaking superconductor LaNiGa<sub>2</sub> by means of quantum oscillation measurements. A comprehensive investigation combining angle-resolved high-field de Haas-van Alphen (dHvA) spectroscopy and first-principles calculations reveals the fermiology of LaNiGa<sub>2</sub> and verifies its nonsymmorphic <i>Cmcm</i> lattice symmetry, which promises nodal band crossings pinned at the Fermi level with fourfold degeneracies. Moreover, such nodal structures, proposed to play a crucial role giving rise to the interorbital triplet pairing, are indeed captured by our dHvA analysis. Our results identify LaNiGa<sub>2</sub> as a prototypical topological crystalline superconductor and highlight the putative contribution of low-energy nodal quasiparticles to unconventional superconducting pairing.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455558","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

Temporal-spatial distribution of YSOs nearby Taurus region

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-18 DOI: 10.1007/s11433-024-2560-7

Jiaming Liu, Min Fang, Chao Liu, Xiaolong Wang, Wenyuan Cui, Licai Deng

{"title":"Temporal-spatial distribution of YSOs nearby Taurus region","authors":"Jiaming Liu, Min Fang, Chao Liu, Xiaolong Wang, Wenyuan Cui, Licai Deng","doi":"10.1007/s11433-024-2560-7","DOIUrl":"10.1007/s11433-024-2560-7","url":null,"abstract":"<div><p>The Taurus region is one of the most extensively studied star-forming regions (SFRs). Surveys indicate that the young stars in this region are comprised of young stellar objects (YSOs) that cluster in groups associated with the molecular cloud (Grouped Young Stellar Objects, GYSOs), and some older ones that are sparsely distributed throughout the region (Distributed Young Stellar Objects, DYSOs). To bridge the age gap between the GYSOs (⩽5 Myr) and the DYSOs (10–20 Myr), we conducted a survey to search for new YSOs in this direction. Based on infrared color excesses and Li I absorption lines, we identified 145 new YSOs. Combining these with the previously identified GYSOs and DYSOs, we constructed a sample of 519 YSOs that encompass the entire region. Subsequently, we calculated the ages of the samples based on their proximity to the local bubble. The age versus distance to the local bubble (<i>D</i><sub>LB</sub>) relationship for the DYSOs shows a clear trend: the farther they are from the local bubble, the younger they are, which is consistent with the supernovae-driven formation scenario of the local bubble. The GYSOs also exhibit a mild age versus <i>D</i><sub>LB</sub> trend. However, they are significantly younger and are mostly confined to distances of 120 to 220 pc. Considering their distribution in the age versus <i>D</i><sub>LB</sub> space is well separated from the older DYSOs, they may also be products of the local bubble but formed in more recent and localized events.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455559","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

Size-dependent vitrification in hybrid glasses at micro-meter scale

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-17 DOI: 10.1007/s11433-024-2489-6

Hui-Ru Zhang, Qun Yang, Zi-Luo Fang, Wei-Xiong Zhang, Zheng Yin, Ming-Hua Zeng, Hai-Bin Yu

{"title":"Size-dependent vitrification in hybrid glasses at micro-meter scale","authors":"Hui-Ru Zhang, Qun Yang, Zi-Luo Fang, Wei-Xiong Zhang, Zheng Yin, Ming-Hua Zeng, Hai-Bin Yu","doi":"10.1007/s11433-024-2489-6","DOIUrl":"10.1007/s11433-024-2489-6","url":null,"abstract":"<div><p>Hybrid glasses are a novel class of glass formers that possess unique coordination bonds. Size effects on vitrification have been observed in other glassy materials such as metallic glasses and polymers, but their impact on hybrid glasses has yet to be explored. In this study, we examine the size-dependent vitrification behavior of hybrid glasses using fast scanning calorimetry across a broad range of heating and cooling rates. Our results are similar to that observed in polymer and metallic glasses, the glass transition temperature (<i>T</i><sub><i>g</i></sub>) is not significantly influenced by sample size at the micro-meter scale at cooling rates larger than or equal to 30 K/s. Furthermore, the vitrification enthalpy displays a clear dependence on sample size, with smaller samples exhibiting a larger overshoot enthalpy, which is attributed to a reduction of fictive temperature values (<i>T</i><sub><i>f</i></sub>) with size. These features originate from the network structure and flexibility of coordination bonding. Our findings suggest that the vitrification enthalpy is more fundamental than the temperature in size effects and that the low enthalpy state of smaller hybrid glass samples has implications for their functional properties.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 6","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446541","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

Dust evolution in protoplanetary disks: Insights from the PDS 70 system with spitzer and JWST

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-14 DOI: 10.1007/s11433-025-2621-5

Ruobing Dong

引用次数: 0

Novel interferometer structure shows the diversity of wave-particle duality

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-14 DOI: 10.1007/s11433-025-2616-x

Xiao-Ming Lu

引用次数: 0

Application of large language models to quantum state simulation

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-14 DOI: 10.1007/s11433-024-2598-y

Shuangxiang Zhou, Ronghang Chen, Zheng An, Chao Zhang, Shi-Yao Hou

{"title":"Application of large language models to quantum state simulation","authors":"Shuangxiang Zhou, Ronghang Chen, Zheng An, Chao Zhang, Shi-Yao Hou","doi":"10.1007/s11433-024-2598-y","DOIUrl":"10.1007/s11433-024-2598-y","url":null,"abstract":"<div><p>Quantum computers leverage the unique advantages of quantum mechanics to achieve acceleration over classical computers for certain problems. Currently, various quantum simulators provide powerful tools for researchers, but simulating quantum evolution with these simulators often incurs high time costs. Additionally, resource consumption grows exponentially as the number of quantum bits increases. To address this issue, our research aims to utilize Large Language Models (LLMs) to simulate quantum circuits. This paper details the process of constructing 1-qubit and 2-qubit quantum simulator models, extending to multiple qubits, and ultimately implementing a 3-qubit example. Our study demonstrates that LLMs can effectively learn and predict the evolution patterns among quantum bits, with minimal error compared to the theoretical output states. Even when dealing with quantum circuits comprising an exponential number of quantum gates, LLMs remain computationally efficient. Overall, our results highlight the potential of LLMs to predict the outputs of complex quantum dynamics, achieving speeds far surpassing those required to run the same process on a quantum computer. This finding provides new insights and tools for applying machine learning methods in the field of quantum computing.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11433-024-2598-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Passive-state preparation for quantum secure direct communication

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-14 DOI: 10.1007/s11433-024-2578-0

Jia-Wei Ying, Jin-Yu Wang, Yu-Xiang Xiao, Shi-Pu Gu, Xing-Fu Wang, Wei Zhong, Ming-Ming Du, Xi-Yun Li, Shu-Ting Shen, An-Lei Zhang, Lan Zhou, Yu-Bo Sheng

{"title":"Passive-state preparation for quantum secure direct communication","authors":"Jia-Wei Ying, Jin-Yu Wang, Yu-Xiang Xiao, Shi-Pu Gu, Xing-Fu Wang, Wei Zhong, Ming-Ming Du, Xi-Yun Li, Shu-Ting Shen, An-Lei Zhang, Lan Zhou, Yu-Bo Sheng","doi":"10.1007/s11433-024-2578-0","DOIUrl":"10.1007/s11433-024-2578-0","url":null,"abstract":"<div><p>Quantum secure direct communication (QSDC) can transmit the secret message directly. Single-photon-based QSDC protocol requires the active modulation of the quantum state of the source, potentially introducing various side-channel vulnerabilities. In this paper, we propose a passive-state preparation QSDC protocol. By utilizing a passive-state preparation method, we remove the need for active modulation, thus eliminating the side-channel risks associated with the source encoder. To evaluate the performance of the protocol, we develop a system model and improve the decoy state method. Through parameter optimization, we identify the optimal secrecy message capacity for various communication distances and compare it with active modulation QSDC. At a communication distance of 10 (15) km, the secrecy message capacity of passive-state preparation QSDC reaches 3.894 × 10<sup>−4</sup> (3.715 × 10<sup>−5</sup>) bit/pulse, achieving 95.3% (91.5%) of the active case’s performance. Meanwhile, we consider the resource consumption and optimize the secrecy message transmission rate of passive-state preparation QSDC. Using a coherent light source with a frequency of 10<sup>6</sup> Hz, at communication distances of 5, 10, and 15 km, the secrecy message transmission rates for passive-state preparation QSDC reach 2.370 × 10<sup>2</sup>, 4.218 × 10, and 2.504 bit/s, respectively.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446480","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

Controllable chaos in the coupled waveguide-optomechanical system with phase shifter

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-14 DOI: 10.1007/s11433-024-2558-3

Deng-Wei Zhang, Pei-Qi Qin, Li-Li Zheng, Zhi-Ming Zhan, Xin-You Lü

引用次数: 0