Science China Physics, Mechanics & Astronomy最新文献_第8页

Dissipation-free approach for realizing non-Hermitian dynamics in a superconducting circuit 实现超导电路非厄米动力学的无耗散方法

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-13 DOI: 10.1007/s11433-024-2549-0

Yi-Hao Kang, Yang Xiao, Yu Wang, Qi-Ping Su, Chui-Ping Yang

{"title":"Dissipation-free approach for realizing non-Hermitian dynamics in a superconducting circuit","authors":"Yi-Hao Kang, Yang Xiao, Yu Wang, Qi-Ping Su, Chui-Ping Yang","doi":"10.1007/s11433-024-2549-0","DOIUrl":"10.1007/s11433-024-2549-0","url":null,"abstract":"<div>Non-Hermitian dynamics exhibits a wealth of surprising and potentially useful phenomena. However, it is typically realized by coupling a system with thermal reservoirs, which makes the system suffer from thermal fluctuations associated with the dissipation. Here, we propose a dissipation-free approach to realize non-Hermitian dynamics using a superconducting circuit composed of two resonators and a superconducting qutrit. The non-Hermiticity arises in the dynamical matrix for the evolution of the two resonators in the Heisenberg picture, via a photon-number non-conserved dynamics. The energy spectrum of the non-Hermitian dynamical matrix can be retrieved by measuring the state of the two resonators, and a phase transition of the energy spectrum can be observed by varying the control parameters. In the realization of the non-Hermitian dynamics, the dissipation of the system and the post-selection are not required. Thus, the approach is implemented in a deterministic way, and the reservoir-induced noise is suppressed. Numerical simulations indicate that the energy spectrum of the non-Hermitian dynamical matrix obtained via the measurement of the resonators is in accordance with the theoretical prediction. Moreover, we demonstrate the parity discrimination for the state of two four-level qudits as an application, exhibiting the potential of the non-Hermitian dynamics in the field of quantum measurement. This work opens a new avenue for the realization of non-Hermitian dynamics and may have a significant implication in exploring the non-Hermitian phenomena.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994587","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

Investigating the p-Ω interactions and correlation functions 研究p-Ω相互作用和相关函数

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-10 DOI: 10.1007/s11433-024-2580-9

Ye Yan, Qi Huang, Youchang Yang, Hongxia Huang, Jialun Ping

{"title":"Investigating the p-Ω interactions and correlation functions","authors":"Ye Yan, Qi Huang, Youchang Yang, Hongxia Huang, Jialun Ping","doi":"10.1007/s11433-024-2580-9","DOIUrl":"10.1007/s11433-024-2580-9","url":null,"abstract":"<div>Motivated by experimental measurements, we investigate the p-Ω correlation functions and interactions on the basis of a quark model. By solving the inverse scattering problem with channel coupling, we renormalize the coupling to other channels into an effective single-channel p-Ω potentials. The effects of Coulomb interaction and spin-averaging are also discussed. According to our results, the depletion of the p-Ω correlation functions, which is attributed to the JP = 2+ bound state not observed in the ALICE Collaboration’s measurements (Nature 588, 232 (2020)), can be explained by the contribution of the attractive JP = 1+ component in spin-averaging. So far, we have provided a consistent description of the p-Ω system from the perspective of the quark model, including the energy spectrum, scattering phase shifts, and correlation functions. The existence of the p-Ω bound state has been supported by all three aspects. Additionally, a sign of the p-Ω correlation function’s subtle sub-unity part can be seen in experimental measurements, which warrants more precise verification in the future.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994520","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

Pulsar scintillation reveals the Gum Nebula as a scattering screen 脉冲星闪烁显示树胶星云是一个散射屏

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-09 DOI: 10.1007/s11433-024-2566-8

Dan Stinebring

引用次数: 0

Modulation of the octahedral structure and potential superconductivity of La3Ni2O7 through strain engineering 应变工程对La3Ni2O7八面体结构和潜在超导性的调制

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-09 DOI: 10.1007/s11433-024-2583-y

Zihao Huo, Zhihui Luo, Peng Zhang, Aiqin Yang, Zhengtao Liu, Xiangru Tao, Zihan Zhang, Shumin Guo, Qiwen Jiang, Wenxuan Chen, Dao-Xin Yao, Defang Duan, Tian Cui

{"title":"Modulation of the octahedral structure and potential superconductivity of La3Ni2O7 through strain engineering","authors":"Zihao Huo, Zhihui Luo, Peng Zhang, Aiqin Yang, Zhengtao Liu, Xiangru Tao, Zihan Zhang, Shumin Guo, Qiwen Jiang, Wenxuan Chen, Dao-Xin Yao, Defang Duan, Tian Cui","doi":"10.1007/s11433-024-2583-y","DOIUrl":"10.1007/s11433-024-2583-y","url":null,"abstract":"<div>The recent transport measurements of La3Ni2O7 uncovered a “right-triangle” shape of the superconducting dome in the pressure-temperature (P-T) phase diagram. Motivated by this, we perform theoretical first-principles studies of La3Ni2O7 with the pressure ranging from 0 to 100 GPa. Notably, we reveal a pressure dependence of the (text{Ni-}d_{,z^{2}}) electron density at the Fermi energy ((n_{z}^{E_{rm{F}}})) that highly coincides with such shape. On this basis, we further explore the electronic structure under uniaxial stress. By tracking the stress response of (n_{z}^{E_{rm{F}}}), we propose that superconductivity can be achieved by applying only ⋃2 GPa of compression along the c axis. The idea is further exemplified from the perspectives of lattice distortion, band structure, Fermi surface and superconducting phase coherence. We also discuss the possible charge modulation under the stress and provide an insight into the relation between (n_{z}^{E_{rm{F}}}) and the superconducting Tc in La3Ni2O7 system. Our study provides new routes to the search of high-Tc superconductors in future experiments.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994624","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

Investigations of liquid-liquid transitions in metallic melts by fast differential scanning calorimetry 快速差示扫描量热法研究金属熔体液-液转变

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-06 DOI: 10.1007/s11433-024-2542-4

Qi Cheng, Yonghao Sun, Weihua Wang

引用次数: 0

Phase saddle point transformation-enabled mode-adaptive detection of acoustic orbital angular momentum with high efficiency and low crosstalk 基于相位鞍点变换的高效低串扰声轨道角动量模式自适应检测

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-03 DOI: 10.1007/s11433-024-2551-3

Kai Wu, Yang Tan, Jingjing Liu, Bin Liang, Jianchun Cheng

{"title":"Phase saddle point transformation-enabled mode-adaptive detection of acoustic orbital angular momentum with high efficiency and low crosstalk","authors":"Kai Wu, Yang Tan, Jingjing Liu, Bin Liang, Jianchun Cheng","doi":"10.1007/s11433-024-2551-3","DOIUrl":"10.1007/s11433-024-2551-3","url":null,"abstract":"<div>Acoustic orbital angular momentum (OAM) provides an infinite set of orthogonal bases in Hilbert space and significantly boosts the link capacity and data transmission rate. High-capacity and low-crosstalk OAM detection within compact physical space is highly desired to effectively harness this spatial dimension of sound wave, but the existing mechanisms generally either operate only for finite OAMs with predetermined mode orders or rely on complicated active devices. Here, we propose a phase saddle point (PSP) transformation mechanism for distinguishing and demultiplexing acoustic OAM modes in a passive, mode-adaptive, high-efficiency, and high-accuracy paradigm. The phase mask characterized by a PSP in the specific area is created through the single-pass log-polar transformation without prior information of incident modes, whose interaction with incident vortex beams of different OAM modes will yield the translation of the stationary phase point and thereby generate the corresponding focused line spots at distinct lateral positions. We theoretically elucidate the mode-adaptive response of PSP transformation by deriving the quantitative relationship between the OAM order and line spot offset. This mode adaptability enables our mechanism to detect OAM of arbitrary mode orders and mode numbers with the inter-mode crosstalk being effectively suppressed, beyond attainable with the existing methods. The effectiveness of our proposed mechanism is validated by demonstrating several distinct examples of single-mode OAM sorting and multi-mode synthesized vortex beam demultiplexing. We anticipate this mode-adaptive methodology, designed for compact dimensions and featuring with low crosstalk and uniform efficiency, will find important applications in OAM information processing.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 5","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940991","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

Largely tunable infrared luminescence from GaAsSb nanowires grown on Si substrate 生长在Si衬底上的GaAsSb纳米线的红外发光很大程度上可调谐

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-02 DOI: 10.1007/s11433-024-2569-1

Guoqiang Zhang

引用次数: 0

Establishing the vector-meson-exchange dominance for the short range interactions of light quarks 建立轻夸克短程相互作用的矢量-介子交换优势

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-12-26 DOI: 10.1007/s11433-024-2561-2

Bing-Song Zou

引用次数: 0

Model-based frequency optimization for frequency-tunable superconducting processors 频率可调超导处理器的基于模型的频率优化

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-12-25 DOI: 10.1007/s11433-024-2548-2

Qiujiang Guo

引用次数: 0

Viscosity in metallic supercooled liquids obtained by fast scanning calorimetry and its application to thermoplastic forming 快速扫描量热法测定金属过冷液体的粘度及其在热塑性成形中的应用

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-12-23 DOI: 10.1007/s11433-024-2522-8

Min Liu, Zheng Wang, Yijun Ding, Senkuan Meng, Lina Hu

{"title":"Viscosity in metallic supercooled liquids obtained by fast scanning calorimetry and its application to thermoplastic forming","authors":"Min Liu, Zheng Wang, Yijun Ding, Senkuan Meng, Lina Hu","doi":"10.1007/s11433-024-2522-8","DOIUrl":"10.1007/s11433-024-2522-8","url":null,"abstract":"<div>Viscosity is a crucial dynamic property for alloy liquids. For alloy liquids with glass-forming ability, their viscosity undergoes a change of more than ten orders of magnitude upon cooling, and eventually, a transition from liquid to glassy state occurs when viscosity reaches 1012 Pa s. Nevertheless, the viscosity measurement in the supercooled liquid region (SLR) has been an experimental challenge. Here, in this work, by combining conventional and fast scanning calorimeters, the accurate viscosity of supercooled liquids for Au49Ag5.5Pd2.3Cu26.9Si16.3 and Zr44Ti11Cu10Ni10Be25 metallic glasses (MGs) was measured over a wide viscosity range of 106–1012 Pa s. Moreover, the viscosity range of 106–108 Pa s is generally selected for thermoplastic forming (TPF), which takes advantage of the dramatic softening that MGs exhibit after being heated into the SLR. We further gave the TPF process window covering the range of processing temperature and time by utilizing the obtained viscosity data and time-temperature-transformation curves. The optimal time window avoiding property degradation was also determined, based on that there was no marked effect on the mechanical properties of MGs when crystallinity was below ∼5%. Our findings not only provide the accurate viscosity data in the SLR, but also determine the optimal process parameters for the TPF process.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 6","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142912889","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