Science China Physics, Mechanics & Astronomy最新文献_第10页

Exploring non-Hermitian dynamics in a superconducting quantum circuit via dissipation-free approach 利用无耗散方法探索超导量子电路中的非厄米动力学

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-15 DOI: 10.1007/s11433-024-2554-0

Yang Yu

引用次数: 0

Tunable non-Markovian and quantum coherence in the single-qubit dephasing noise channel 单量子位去相噪声信道中的可调谐非马尔可夫相干和量子相干

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-15 DOI: 10.1007/s11433-024-2565-2

Na-Na Zhang, Chao-Yi Wu, Xu Zhou, Qi-Yuan Liu, Cheng-Ge Liu, Yong-Rui Guo, Ren-Pu Li

{"title":"Tunable non-Markovian and quantum coherence in the single-qubit dephasing noise channel","authors":"Na-Na Zhang, Chao-Yi Wu, Xu Zhou, Qi-Yuan Liu, Cheng-Ge Liu, Yong-Rui Guo, Ren-Pu Li","doi":"10.1007/s11433-024-2565-2","DOIUrl":"10.1007/s11433-024-2565-2","url":null,"abstract":"<div>In this paper, we construct a single-qubit dephasing noise channel based on the nuclear magnetic resonance (NMR) system by employing the bath-engineering technology, and achieve the construction of the tunable non-Markovian environment in the dephasing noise channel. Our findings indicate that for the single-qubit system, the transition of system dynamics from Markovian to non-Markovian can be achieved by adjusting the base frequency of the noise power spectrum. However, the base frequency corresponding to this phase transition point is not fixed, and there is a certain relationship between it and the total evolution time of the single-qubit system. Through our research, we discovered a fundamental relationship: if the single-qubit system dynamics undergoe a transition from Markovian to non-Markovian at ω0 within 0–2t ms, shortening the evolution time to 0-t ms results in an increase of the phase transition point to 2ω0. This insight offers crucial guidance for artificially crafting non-Markovian environments across arbitrary time scales in single-qubit systems, and it is not limited by the type of noise. Apart from system dynamics, quantum coherence is also a focal point of our research. We find that when the system dynamics exhibit non-Markovian behavior, the quantum coherence of the single-qubit system experiences revivals. Notably, the timing of these coherence revivals aligns with the instants of the non-Markovianity enhancement. Therefore, our research also serves as a pivotal foundation for the artificial manipulation and realization of quantum coherence revivals within diverse single-qubit systems.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994369","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

Anomalous open orbits in Hofstadter spectrum of Chern insulator 陈氏绝缘子霍夫施塔特谱中的异常开轨道

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-14 DOI: 10.1007/s11433-024-2564-8

Haijiao Ji, Peng Zhou, Noah F. Q. Yuan, Hua Jiang, Haiwen Liu, X. C. Xie

{"title":"Anomalous open orbits in Hofstadter spectrum of Chern insulator","authors":"Haijiao Ji, Peng Zhou, Noah F. Q. Yuan, Hua Jiang, Haiwen Liu, X. C. Xie","doi":"10.1007/s11433-024-2564-8","DOIUrl":"10.1007/s11433-024-2564-8","url":null,"abstract":"<div>The nontrivial band topology of Chern insulator can enrich the content of its Hofstadter butterfly spectra, which is closely related to recent experiments in twisted bilayer graphene and cold atom systems. We investigate the Hofstadter spectrum for various models of Chern insulators under a rational flux ({phi_{0}}over{q}), here (phi_{0}={hover{e}}) and q being an integer. We find the number of splitting subbands is ∣q − C∣ with C denoting the Chern number of parent band. Importantly, anomalous open-orbital subbands with Chern numbers q − 1 and −q − 1 emerge unexpectedly, which are beyond the parameter window (−q/2, q/2) of the Diophantine equation studied by Thouless-Kohmoto-Nightingale-den Nijs [Phys. Rev. Lett. 49, 405 (1982)]. The emergence of anomalous open orbits can be traced by analyzing the evolution of the Hofstadter spectrum, identifying as a new type of topological phase transition. These novel findings not only pinpoint the peculiar Hofstadter spectrum of Chern insulator, but also provide routes to study exotic characteristics beyond the Landau level physics.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994589","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

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