Physical Review A最新文献_第2页

Two-photon superradiance and subradiance 双光子超辐射和次辐射

2区物理与天体物理

Physical Review A Pub Date : 2025-10-08 DOI: 10.1103/dbny-pjqc

W. Xie, Imran M. Mirza, John C. Schotland

引用次数: 1

Reviving coherence and time crystals with nonreciprocal coupling 恢复非互反耦合的相干性和时间晶体

2区物理与天体物理

Physical Review A Pub Date : 2025-08-26 DOI: 10.1103/ht7n-bdp9

K. Karthiga, D. V. Senthilkumar, V. K. Chandrasekar

{"title":"Reviving coherence and time crystals with nonreciprocal coupling","authors":"K. Karthiga, D. V. Senthilkumar, V. K. Chandrasekar","doi":"10.1103/ht7n-bdp9","DOIUrl":"https://doi.org/10.1103/ht7n-bdp9","url":null,"abstract":"The interplay between coherence, dissipation, and nonreciprocal interactions plays a crucial role in engineering novel dynamical phases of open quantum systems. Here, we consider two collective spin ensembles, each coupled to its own driven-dissipative bosonic mode, and interacting via a common dissipative bosonic field. By introducing nonreciprocity through asymmetric couplings to the shared field, we demonstrate that quantum coherence can be revived from fully decohered states. This revival signals a transition from a time-translational symmetric phase to a spontaneously time-translation symmetry-broken phase, realizing a continuous time crystal. Remarkably, steady-state entanglement emerges even in regions where macroscopic coherence is absent, underscoring the nontrivial impact of engineered dissipation. The phase transitions are characterized using numerical simulations of the full quantum master equation, mean-field analysis in the thermodynamic limit, and Liouvillian spectral properties. Our work provides a robust framework to realize coherence enhancement, steady-state entanglement, and time-crystalline behavior in driven-dissipative quantum systems.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"112 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147897439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 1

Highly sensitive temperature sensing via quadratic optomechanical coupling 通过二次光-力耦合实现高灵敏度的温度传感

2区物理与天体物理

Physical Review A Pub Date : 2025-06-02 DOI: 10.1103/1f8d-44ym

Yusheng Tang, Xun‐Wei Xu, Jie‐Qiao Liao, Hui Jing, Le‐Man Kuang

引用次数: 1

Microwave continuous-variable quantum key distribution in the open air 露天微波连续变量子密钥分配

2区物理与天体物理

Physical Review A Pub Date : 2025-04-30 DOI: 10.1103/physreva.111.042627

Y. Feng, Gang Xu, Xiu‐Bo Chen, Ying Guo

{"title":"Microwave continuous-variable quantum key distribution in the open air","authors":"Y. Feng, Gang Xu, Xiu‐Bo Chen, Ying Guo","doi":"10.1103/physreva.111.042627","DOIUrl":"https://doi.org/10.1103/physreva.111.042627","url":null,"abstract":"Continuous-variable quantum key distribution (CV-QKD) enables the efficient distribution of unconditionally secure keys for both communicating parties. Despite significant advancements in optical-based CV-QKD, a persistent challenge is the limited resilience of optical quantum signals to atmospheric noise in free-space channels. This susceptibility leads to considerable degradation in the performance of optical CV-QKD systems, particularly under adverse climatic conditions. Meanwhile, recent advancements in superconducting quantum computing have driven the demand for quantum communication between spatially separated superconducting processors operating at microwave frequencies. To solve the problems, we propose a Gaussian-modulated coherent-state protocol operating at microwave frequencies, utilizing traveling-wave parametric amplifiers to generate entangled states. Our numerical analysis demonstrates that CV-QKD at microwave frequencies enables secure communication in a free-space channel at room temperature. Furthermore, we show that this protocol outperforms the THz frequency protocol over a distance of 20 m and exhibits stronger immunity to interference. Finally, we consider the impact of microwave antenna gain on the protocol's performance, highlighting the decisive role of antenna gain in determining the maximum transmission distance in practical application scenarios.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"111 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147891139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Single-photon isolation and nonreciprocal frequency conversion in atom-waveguide systems 原子波导系统中的单光子隔离和非倒易频率转换

2区物理与天体物理

Physical Review A Pub Date : 2025-04-28 DOI: 10.1103/physreva.111.043717

Jun-Cong Zheng, Xiao-Wei Zheng, Xin‐Lei Hei, Yi‐Fan Qiao, Xiao‐Yu Yao, Xue‐Feng Pan, Yu‐Meng Ren, Xiao-Wen Huo, Fuli Li

{"title":"Single-photon isolation and nonreciprocal frequency conversion in atom-waveguide systems","authors":"Jun-Cong Zheng, Xiao-Wei Zheng, Xin‐Lei Hei, Yi‐Fan Qiao, Xiao‐Yu Yao, Xue‐Feng Pan, Yu‐Meng Ren, Xiao-Wen Huo, Fuli Li","doi":"10.1103/physreva.111.043717","DOIUrl":"https://doi.org/10.1103/physreva.111.043717","url":null,"abstract":"In this work, we utilize a two-level atom and a $mathrm{ensuremath{Lambda}}$-type atom to link two identical waveguides, subsequently extending the model to a giant-atom configuration. Our analytical solutions and numerical simulations demonstrate that this setup can achieve single-photon isolation and nonreciprocal frequency conversion by tuning the atom-waveguide coupling strengths ${g}_{i}$, respectively. We also examine single-photon scattering in the giant-atom model within both the Markovian and non-Markovian regimes. The results reveal that ultranarrow scattering windows are induced by the phases ${ensuremath{phi}}_{1}$ and ${ensuremath{phi}}_{2}$ under specific conditions, making them well suited for precise frequency conversion and sensing. Additionally, in the non-Markovian regime, the spectra exhibit irregular polygonal shapes, offering enhanced opportunities for exploring nonreciprocal frequency conversion in the off-resonant regime. Our work provides an alternative perspective on achieving optical nonreciprocity at the single-photon level in atom-waveguide systems.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"111 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147922012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 6

Signal partitioning in superfluid He4: A Monte Carlo approach 超流体He4中的信号划分：蒙特卡罗方法

2区物理与天体物理

Physical Review A Pub Date : 2025-02-24 DOI: 10.1103/physrevd.111.032013

F. Toschi, Axel Brunold, Lea Burmeister, K. Eitel, C. Enss, E. Fascione, T. Ferber, Rahel Gabriel, L. Hauswald, Felix Kahlhoefer, Sebastian Kempf, Markus Klute, B. von Krosigk, S. Lindemann, Benedikt Maier, M. Schümann, Melih Solmaz, K. Valerius, Friedrich Carl Wagner

{"title":"Signal partitioning in superfluid <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>He</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mn>4</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>: A Monte Carlo approach","authors":"F. Toschi, Axel Brunold, Lea Burmeister, K. Eitel, C. Enss, E. Fascione, T. Ferber, Rahel Gabriel, L. Hauswald, Felix Kahlhoefer, Sebastian Kempf, Markus Klute, B. von Krosigk, S. Lindemann, Benedikt Maier, M. Schümann, Melih Solmaz, K. Valerius, Friedrich Carl Wagner","doi":"10.1103/physrevd.111.032013","DOIUrl":"https://doi.org/10.1103/physrevd.111.032013","url":null,"abstract":"Superfluid <a:math xmlns:a=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><a:mrow><a:mmultiscripts><a:mrow><a:mi>He</a:mi></a:mrow><a:mprescripts/><a:none/><a:mrow><a:mn>4</a:mn></a:mrow></a:mmultiscripts></a:mrow></a:math> is an ideal candidate for the direct detection of light dark matter via nuclear recoils thanks to its low nuclear mass and the possibility to reach a low-detection-energy threshold by exploiting the generated quasiparticles. The design of future detectors based on this target, such as the DELight experiment, requires a proper understanding of the formation and partitioning of the signal for different energy depositions from various sources. This work presents an overview of the physical processes involved in the energy deposition of recoiling electrons and ions, and it describes a Monte Carlo approach to the partitioning of the signal into different channels. Despite an overall good agreement with existing literature, differences in the region of interest for light dark matter searches below 200 eV are observed.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"111 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"http://link.aps.org/pdf/10.1103/PhysRevD.111.032013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147915499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 1

Optimal limits of continuously monitored thermometers and their Hamiltonian structure 连续监测温度计的最佳极限及其哈密顿结构

2区物理与天体物理

Physical Review A Pub Date : 2025-02-05 DOI: 10.1103/physreva.111.l020401

Mohammad Mehboudi, Florian Meier, Marcus Huber, Harry J. D. Miller

{"title":"Optimal limits of continuously monitored thermometers and their Hamiltonian structure","authors":"Mohammad Mehboudi, Florian Meier, Marcus Huber, Harry J. D. Miller","doi":"10.1103/physreva.111.l020401","DOIUrl":"https://doi.org/10.1103/physreva.111.l020401","url":null,"abstract":"We investigate the fundamental and practical precision limits of thermometry in bosonic and fermionic environments by coupling an <a:math xmlns:a=\"http://www.w3.org/1998/Math/MathML\"><a:mi>N</a:mi></a:math>-level probe to them and continuously monitoring it. Our findings show that the ultimate precision limit, quantified by the Fisher information, scales linearly with <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mi>N</b:mi></b:math>, offering an exponential improvement over equilibrium thermometry, where the scaling is only <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:msup><c:mo form=\"prefix\">log</c:mo><c:mn>2</c:mn></c:msup><c:mi>N</c:mi></c:mrow></c:math>. For a fixed Hamiltonian structure, we develop a maximum-likelihood estimation strategy that maps the observed continuously monitored trajectories of the probe into temperature estimates with minimal error. By optimizing over all possible Hamiltonian structures, we discover that the optimal configuration is an effective two-level system, with both levels exhibiting degeneracy that increases with <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mi>N</e:mi></e:math>—a stark contrast to equilibrium thermometry, where the ground state remains nondegenerate. Our results have practical implications. First, continuous monitoring is experimentally feasible on several platforms and accounts for the preparation time of the probe, which is often overlooked in other approaches such as prepare and reset. Second, the linear scaling is robust against deviations from the effective two-level structure of the optimal Hamiltonian. Additionally, this robustness extends to cases of initial ignorance about the temperature. Thus, in global estimation problems, the linear scaling remains intact even without adaptive strategies.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"111 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147911173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 1

Stochastic action for the entanglement of a noisy monitored two-qubit system 噪声监测双量子位系统纠缠的随机作用

2区物理与天体物理

Physical Review A Pub Date : 2025-01-28 DOI: 10.1103/physreva.111.012442

D. G. Shea, Alessandro Romito

引用次数: 1

Lie-algebraic quantum phase reduction based on heterodyne detection 基于外差检测的lie -代数量子相位缩减

2区物理与天体物理

Physical Review A Pub Date : 2025-01-02 DOI: 10.1103/physreva.111.012202

Wataru Setoyama, Yoshihiko Hasegawa

引用次数: 1

One-dimensional model potentials optimized for the calculation of high-order-harmonic-generation spectra 高次谐波谱计算的一维模型电势优化