Science China Physics, Mechanics & Astronomy最新文献_第4页

Entanglement dynamics in κ-deformed spacetime κ变形时空中的纠缠动力学

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-16 DOI: 10.1007/s11433-023-2419-7

Xiaobao Liu, Zehua Tian, Jiliang Jing

{"title":"Entanglement dynamics in κ-deformed spacetime","authors":"Xiaobao Liu, Zehua Tian, Jiliang Jing","doi":"10.1007/s11433-023-2419-7","DOIUrl":"10.1007/s11433-023-2419-7","url":null,"abstract":"<div><p>We treat two identical and mutually independent two-level atoms that are coupled to a quantum field as an open quantum system. The master equation that governs their evolution is derived by tracing over the degree of freedom of the field. With this, we compare the entanglement dynamics of the two atoms moving with different trajectories in <i>κ</i>-deformed and Minkowski spacetimes. Notably, when the environment-induced interatomic interaction does not exist, the entanglement dynamics of two static atoms in <i>κ</i>-deformed spacetime are reduced to that in Minkowski spacetime in the case that the spacetime deformation parameter <i>κ</i> is sufficiently large as theoretically predicted. However, if the atoms undergo relativistic motion, regardless of whether inertial or non-inertial, their entanglement dynamics in <i>κ</i>-deformed spacetime behave differently from that in Minkowski spacetime even when <i>κ</i> is large. We investigate various types of entanglement behavior, such as decay and generation, and discuss how different relativistic motions, such as uniform motion in a straight line and circular motion, amplify the differences in the entanglement dynamics between the <i>κ</i>-deformed and Minkowski spacetime cases. In addition, when the environment-induced interatomic interaction is considered, we find that it may also enhance the differences in the entanglement dynamics between these two spacetimes. Thus, in principle, one can tell whether she/he is in <i>κ</i>-deformed or Minkowski spacetime by checking the entanglement behavior between two atoms in certain circumstances.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142194578","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

Revealing high-dimensional dynamical symmetry in alignment magnetic resonance 揭示排列磁共振的高维动态对称性

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-16 DOI: 10.1007/s11433-024-2444-5

M. Suhail Zubairy

引用次数: 0

A new route to weak force sensing beyond SQL: Squeezed magnons in cavity magnomechanics 超越 SQL 的弱力感应新途径：空腔磁力学中的挤压磁子

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-15 DOI: 10.1007/s11433-024-2454-2

Ş. K. Özdemir

引用次数: 0

The pseudospectrum and spectrum (in)stability of quantum corrected Schwarzschild black hole 量子修正的施瓦兹柴尔德黑洞的伪谱和谱（不）稳定性

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-13 DOI: 10.1007/s11433-024-2435-5

Li-Ming Cao, Jia-Ning Chen, Liang-Bi Wu, Libo Xie, Yu-Sen Zhou

{"title":"The pseudospectrum and spectrum (in)stability of quantum corrected Schwarzschild black hole","authors":"Li-Ming Cao, Jia-Ning Chen, Liang-Bi Wu, Libo Xie, Yu-Sen Zhou","doi":"10.1007/s11433-024-2435-5","DOIUrl":"10.1007/s11433-024-2435-5","url":null,"abstract":"<div><p>In this study, we investigate the pseudospectrum and spectrum (in)stability of quantum corrected Schwarzschild black hole. Methodologically, we use the hyperboloidal framework to cast the quasinormal mode (QNM) problem into an eigenvalue problem associated with a non-selfadjoint operator, and then the spectrum and pseudospectrum are depicted. Besides, the invariant subspace method is exploited to improve the computational efficiency for pseudospectrum. The investigation into the spectrum (in)stability entails two main aspects. On the one hand, we calculate the spectra of the quantum corrected black hole, then by the means of the migration ratio, the impact of the quantum correction effect on the Schwarzschild black hole has been studied. The results indicate that the so-called “migration ratio instability” will occur for small black holes with small angular momentum number <i>l</i>. In the eikonal limit, the migration ratios remain the same for each overtone. On the other hand, we study the spectrum (in)stability of the quantum corrected black hole by directly adding some particular perturbations into the effective potential, where perturbations are located at the event horizon and null infinity, respectively. There are two interesting observations under the same perturbation energy norm. First, perturbations at infinity are more capable of generating spectrum instability than those at the event horizon. Second, we find that the peak distribution can lead to the instability of QNM spectrum more efficiently than the average distribution.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11433-024-2435-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142194579","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

Advancements in nanofluidics: Unveiling the dynamics of nanoconfined water and its implications for emerging technologies 纳米流体技术的进展：揭示纳米封闭水的动力学及其对新兴技术的影响

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-13 DOI: 10.1007/s11433-024-2463-2

Bohayra Mortazavi, Ali Akbar Zinatizadeh

引用次数: 0

Advances in laser-plasma interactions using intense vortex laser beams 使用强漩涡激光束的激光等离子体相互作用研究进展

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-06 DOI: 10.1007/s11433-024-2422-2

Yin Shi, Xiaomei Zhang, Alexey Arefiev, Baifei Shen

{"title":"Advances in laser-plasma interactions using intense vortex laser beams","authors":"Yin Shi, Xiaomei Zhang, Alexey Arefiev, Baifei Shen","doi":"10.1007/s11433-024-2422-2","DOIUrl":"10.1007/s11433-024-2422-2","url":null,"abstract":"<div><p>Low-intensity light beams carrying orbital angular momentum (OAM), commonly known as vortex beams, have garnered significant attention due to promising applications in areas ranging from optical trapping to communication. In recent years, there has been a surge in global research exploring the potential of high-intensity vortex laser beams and specifically their interactions with plasmas. This paper provides a comprehensive review of recent advances in this area. Compared with conventional laser beams, intense vortex beams exhibit unique properties such as twisted phase fronts, OAM delivery, hollow intensity distribution, and spatially isolated longitudinal fields. These distinct characteristics give rise to a multitude of rich phenomena, profoundly influencing laser-plasma interactions and offering diverse applications. The paper also discusses future prospects and identifies promising general research areas involving vortex beams. These areas include low-divergence particle acceleration, instability suppression, high-energy photon delivery with OAM, and the generation of strong magnetic fields. With growing scientific interest and application potential, the study of intense vortex lasers is poised for rapid development in the coming years.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931564","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 advantages for image filtering on images with efficient encoding and lower-bounded signal-to-noise ratio 在具有高效编码和较低信噪比限制的图像上进行图像滤波的量子优势

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-05 DOI: 10.1007/s11433-024-2391-8

Zidong Cui, Shan Jin, Akira Sone, Xiaoting Wang

引用次数: 0

Effective integration of highly-efficient focusing apodized grating and quantum dots on a solid substrate for scalable quantum photonic circuits 在固体衬底上有效集成高效聚焦光栅和量子点，实现可扩展的量子光子电路

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-05 DOI: 10.1007/s11433-024-2414-0

Beimeng Yao, Rongbin Su, Shunfa Liu, Changkun Song, Ying Yu, Jin Liu, Xuehua Wang

{"title":"Effective integration of highly-efficient focusing apodized grating and quantum dots on a solid substrate for scalable quantum photonic circuits","authors":"Beimeng Yao, Rongbin Su, Shunfa Liu, Changkun Song, Ying Yu, Jin Liu, Xuehua Wang","doi":"10.1007/s11433-024-2414-0","DOIUrl":"10.1007/s11433-024-2414-0","url":null,"abstract":"<div><p>Recent advancements in quantum photonic circuits have significantly influenced the field of quantum information processing. The pursuit of an integrated quantum photonic circuit that offers an active, stable platform for large-scale integration and high processing efficiency remains a key objective. The grating coupler, as a crucial element for an efficient transformation output interface in the integrated quantum photonic circuits, presents significant potential for practical applications. Here, we demonstrate the integration block of a highly efficient shallow-etched focusing apodized grating coupler with indium arsenide (InAs) quantum dots (QDs) in gallium arsenide (GaAs) on a SiO<sub>2</sub> substrate for active quantum photonic circuits. The designed grating couplers possess a high efficiency over 90% in the broadband (900–930 nm) from the circuit to free space, and a nearly-perfect match with the fiber mode. Experimentally, the efficiency to free space reaches 81.8%, and the match degree with the fiber mode is high up to 92.1%. The proposed integration block offers the potential for large-scale integration of active quantum photonic circuits due to its stable solid substrate and highly performant output for quantum measurements.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931573","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

Advancements in quantum image filtering: Exponential speedup on a subset of images 量子图像过滤技术的进步：在子集图像上指数级提速

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-05 DOI: 10.1007/s11433-024-2429-x

Lvzhou Li

引用次数: 0

Evidence for distortion-induced local electric polarization in α-RuCl3 α-RuCl3中畸变诱导局部电极化的证据

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-02 DOI: 10.1007/s11433-024-2417-8

Xinrun Mi, De Hou, Xiao Wang, Sabreen Hammouda, Caixing Liu, Zijian Xiong, Han Li, Yan Liu, Guiwen Wang, Aifeng Wang, Yisheng Chai, Yang Qi, Wei Li, Xiaoyuan Zhou, Yixi Su, D. I. Khomskii, Mingquan He, Zhigao Sheng, Young Sun

{"title":"Evidence for distortion-induced local electric polarization in α-RuCl3","authors":"Xinrun Mi, De Hou, Xiao Wang, Sabreen Hammouda, Caixing Liu, Zijian Xiong, Han Li, Yan Liu, Guiwen Wang, Aifeng Wang, Yisheng Chai, Yang Qi, Wei Li, Xiaoyuan Zhou, Yixi Su, D. I. Khomskii, Mingquan He, Zhigao Sheng, Young Sun","doi":"10.1007/s11433-024-2417-8","DOIUrl":"10.1007/s11433-024-2417-8","url":null,"abstract":"<div><p>The spin-orbit assisted Mott insulator α-RuCl<sub>3</sub> is a prime candidate for material realization of the Kitaev quantum spin liquid. While little attention has been paid to charge degrees of freedom, charge effects, such as electric polarization, may arise in this system. Here, we report distortion-induced local electric polarization in α-RuCl<sub>3</sub> as evidenced by single-crystal X-ray diffraction, second harmonic generation (SHG) and dielectric measurements. The SHG signal appears at room temperature and develops substantially in the Kitaev paramagnetic state when short-range spin correlations come into play. Despite sizable pyroelectric currents in the Kitaev paramagnetic state, the absence of hysteresis in the polarization-electric field (<i>P-E</i>) points to the short-range nature of electric polarization. This localized electric polarization is likely the result of distortion-induced charge dimerization, achieved through virtual hopping-induced charge redistribution. In addition, the electric polarization is boosted by short-range spin correlations via spin-phonon coupling in the Kitaev paramagnetic state. Our results emphasize the importance of charge degrees of freedom in α-RuCl<sub>3</sub>, which establish a novel platform to investigate charge effects in Kitaev materials.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931568","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