Physical Review A最新文献_第3页

Performance advantage of protective quantum measurements 保护性量子测量的性能优势

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-17 DOI: 10.1103/physreva.110.032215

Maximilian Schlosshauer

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Temperature dependence of optical phase transitions in a system of two-level atoms and photons interacting inside a nonlinear cavity 在非线性腔内相互作用的两级原子和光子系统中光学相变的温度依赖性

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-17 DOI: 10.1103/physreva.110.033714

S. Samimi, M. M. Golshan

{"title":"Temperature dependence of optical phase transitions in a system of two-level atoms and photons interacting inside a nonlinear cavity","authors":"S. Samimi, M. M. Golshan","doi":"10.1103/physreva.110.033714","DOIUrl":"https://doi.org/10.1103/physreva.110.033714","url":null,"abstract":"In the present work, the role of temperature in the occurrence of optical phases in a system of a large number of atoms interacting with photons is reported. To this end, it is assumed that the cavity inside which the constituents interact is in equilibrium with a heat reservoir, held at a <i>fixed temperature</i>. To achieve this goal, we start with the conventional density operator to calculate the mean values of electromagnetic quadratures. To make the realization of three distinct optical phases, trivial, electric, and magnetic superradiance, possible, the medium inside the cavity is assumed to be a second-order nonlinear one. The nonlinearity of the medium is further assumed to be activated by an externally applied classical pump field. As a consequence, now there are <i>two</i> external controlling agents, the temperature and nonlinearity strength. We then proceed to calculate the quadrature mean values in the thermodynamical limit and for a large number of atoms as a function of temperature. An analysis of the calculated mean values, along with relevant figures, reveals temperature-dependent conditions for realizing trivial, electric, and magnetic optical phases. Moreover, we shall demonstrate that the atom-field coupling strength gives rise to two distinct regimes where the optical phases behave quite differently. In one of the two regimes it is possible for the phases to coexist, while in the other it is not. As a profound result, it is demonstrated that for such a system there can exist a unique temperature (triple point) at which the three optical phases coexist.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"32 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262928","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

Quantifying genuine tripartite entanglement by reshaping the state 通过重塑状态量化真正的三方纠缠

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-17 DOI: 10.1103/physreva.110.032420

Dong-Dong Dong, Li-Juan Li, Xue-Ke Song, Liu Ye, Dong Wang

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Surface criticality in the mixed-field Ising model with sign-inverted next-nearest-neighbor interaction 具有符号反转近邻相互作用的混合场伊辛模型的表面临界性

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-17 DOI: 10.1103/physreva.110.033319

Yuki Nakamura, Ryui Kaneko, Ippei Danshita

{"title":"Surface criticality in the mixed-field Ising model with sign-inverted next-nearest-neighbor interaction","authors":"Yuki Nakamura, Ryui Kaneko, Ippei Danshita","doi":"10.1103/physreva.110.033319","DOIUrl":"https://doi.org/10.1103/physreva.110.033319","url":null,"abstract":"Rydberg atoms in an optical tweezer array have been used as a quantum simulator of the spin-<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></math> antiferromagnetic Ising model with longitudinal and transverse fields. We suggest how to implement the next-nearest-neighbor (NNN) interaction the sign of which is opposite to that of the nearest-neighbor one in the Rydberg atom systems. We show that this can be achieved by weakly coupling one Rydberg state with another Rydberg state. We further study the surface criticality associated with the first-order quantum phase transition between the antiferromagnetic and paramagnetic phases, which emerges due to the sign-inverted NNN interaction. From the microscopic model, we derive a Ginzburg-Landau (GL) equation, which describes static and dynamic properties of the antiferromagnetic order parameter near the transition. Using both analytical GL theory and numerical method based on a mean-field theory, we calculate the order parameter in the proximity of a boundary of the system in order to show that the healing length of the order parameter logarithmically diverges, signaling the surface criticality.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"18 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262920","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

Stability and dynamics of nonlinear excitations in a two-dimensional droplet-bearing environment 二维液滴环境中非线性激振的稳定性和动态性

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-16 DOI: 10.1103/physreva.110.033317

G. Bougas, G. C. Katsimiga, P. G. Kevrekidis, S. I. Mistakidis

{"title":"Stability and dynamics of nonlinear excitations in a two-dimensional droplet-bearing environment","authors":"G. Bougas, G. C. Katsimiga, P. G. Kevrekidis, S. I. Mistakidis","doi":"10.1103/physreva.110.033317","DOIUrl":"https://doi.org/10.1103/physreva.110.033317","url":null,"abstract":"We unravel stationary states in the form of dark soliton stripes, bubbles, and kinks embedded in a two-dimensional droplet-bearing setting emulated by an extended Gross-Pitaevskii approach. The existence of these configurations is corroborated through an effectively reduced potential picture demonstrating their concrete parametric regions of existence. The excitation spectra of such configurations are analyzed within the Bogoliubov–de Gennes framework exposing the destabilization of dark soliton stripes and bubbles, while confirming the stability of droplets, and importantly unveiling spectral stability of the kink against transverse excitations. Additionally, a variational approach is constructed providing access to the transverse stability analysis of the dark soliton stripe for arbitrary chemical potentials and widths of the structure. This is subsequently compared with the stability analysis outcome demonstrating very good agreement at small wave numbers. Dynamical destabilization of dark soliton stripes via the snake instability is showcased, while bubbles are found to feature both a splitting into a gray soliton pair and a transverse instability thereof. These results shed light on unexplored stability and instability properties of nonlinear excitations in environments featuring a competition of mean-field repulsion and beyond-mean-field attraction that can be probed by state-of-the-art experiments.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"124 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262929","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

One-dimensional Z2 lattice gauge theory in periodic Gauss-law sectors 周期性高斯定律扇形中的一维 Z2 格规理论

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-16 DOI: 10.1103/physreva.110.033314

Vaibhav Sharma, Erich J. Mueller

引用次数: 0

Enhanced high-order harmonic generation by spatially-structured-light–induced topological-edge-state dynamics 空间结构光诱导拓扑边沿态动力学增强高阶谐波生成

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-16 DOI: 10.1103/physreva.110.033111

Jianghua Luo, Jiajun Xiao, Zhongwei Wu, Yang Li, Xiaosong Zhu, Yueming Zhou

引用次数: 0

Local-field corrections of the Green's tensor in chiral media 手性介质中格林张量的局部场修正

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-16 DOI: 10.1103/physreva.110.033109

Janine C. Franz, Stefan Yoshi Buhmann, A. Salam

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Dimensional advantage in secure information trading via the noisy dense-coding protocol 通过噪声密集编码协议实现安全信息交易的维度优势

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-16 DOI: 10.1103/physreva.110.032419

Ayan Patra, Rivu Gupta, Tamoghna Das, Aditi Sen(De)

{"title":"Dimensional advantage in secure information trading via the noisy dense-coding protocol","authors":"Ayan Patra, Rivu Gupta, Tamoghna Das, Aditi Sen(De)","doi":"10.1103/physreva.110.032419","DOIUrl":"https://doi.org/10.1103/physreva.110.032419","url":null,"abstract":"The quantum dense-coding (DC) protocol, which has no security feature, deals with the transmission of classical information encoded in a quantum state by using shared entanglement between a single sender and a single receiver. Its appropriate variant has been established as a quantum key distribution (QKD) scheme for shared two-qubit maximally entangled states, with the security proof utilizing the uncertainty relation of complementary observables and the Shor-Preskill entanglement purification scheme. We present the DC-based QKD protocol for higher-dimensional systems and report the lower bounds on the secret key rate, when the shared state is a two-qudit maximally entangled state, and mixtures of maximally entangled states with different ranks. The analysis also includes the impact of noisy channels on the secure key rates, before and after encoding. In both the noiseless and the noisy scenarios, we demonstrate that the key rate as well as the robustness of the protocol against noise increases with the dimension. Further, we prove that the set of useless states in the DC-based QKD protocol is convex and compact.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"18 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262931","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

Four-qubit photonic system for publicly verifiable quantum random numbers and generation of public and private key 用于公开验证量子随机数以及生成公钥和私钥的四量子比特光子系统

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-16 DOI: 10.1103/physreva.110.032615

Mayalakshmi Kolangatt, Anirudh Verma, Sujai Matta, Kanad Sengupta, C. M. Chandrashekar

{"title":"Four-qubit photonic system for publicly verifiable quantum random numbers and generation of public and private key","authors":"Mayalakshmi Kolangatt, Anirudh Verma, Sujai Matta, Kanad Sengupta, C. M. Chandrashekar","doi":"10.1103/physreva.110.032615","DOIUrl":"https://doi.org/10.1103/physreva.110.032615","url":null,"abstract":"We theoretically propose and experimentally demonstrate the use of a configurable four-qubit photonic system to generate publicly verifiable quantum random numbers, to perform entanglement verification, and to generate a secure public and private key. Quantum circuits, to generate the desired four-qubit states and its experimental realization in the photonic architecture, are carried out using photon pairs entangled in polarization and path degrees of freedom. By performing measurements on the four-qubit system and accessing partial information of the four-qubit state for public verification, we generate publicly verified and purely secured random bits at the rate of 185 kbps from collective data of 370 kbps. When the system is used for generating public and private keys, an equal number of public and private keys are generated simultaneously. We also record about 97.9% of sampled bits from four-qubit states passing entanglement verification and demonstrate the use of public and private key generated for image encryption-decryption. The theoretical model of noise on the four-qubit state and its effect on the generation rate of verified and secured bits are in perfect agreement with the experimental results. This demonstrates the practical use of the small-scale multiqubit photonic system for quantum-safe applications by providing the option for real-time verification of the security feature of the quantum system.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"24 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262934","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