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Non-Gaussian feature of the output field from a double qubit-cavity ultrastrong coupling system 双量子比特腔超强耦合系统输出场的非高斯特征
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-06-02 DOI: 10.1088/1572-9494/ad393f
Sheng-wen Xu, Shi-yu Dai and Teng Zhao
{"title":"Non-Gaussian feature of the output field from a double qubit-cavity ultrastrong coupling system","authors":"Sheng-wen Xu, Shi-yu Dai and Teng Zhao","doi":"10.1088/1572-9494/ad393f","DOIUrl":"https://doi.org/10.1088/1572-9494/ad393f","url":null,"abstract":"We investigate the non-Gaussian feature of radiation in a circuit quantum electrodynamics (QED) system where two qubits are strongly coupled to a single-mode cavity. In the regime of ultrastrong coupling (USC), the rotating-wave approximation is not valid, and the Rabi Hamiltonian contains counter-rotating wave terms, leading to level crossing and avoided crossings in the energy spectrum. We further analyze the intensity-amplitude correlation of the output field in these two novel scenarios. In the USC regime, the creation and annihilation operators in the correlation function are replaced, allowing for the identification of non-Gaussian features in the output field. Our findings reveal that despite the absence of squeezing effects in the output light, significant non-Gaussian characteristics are present. Additionally, we demonstrate that as the driving or coupling strength increases, the non-Gaussian features of the output field become more pronounced. This suggests that USC systems hold broad potential applications in the realms of nonlinear optics and the generation of non-Gaussian states.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"43 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141258471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Probing the Bardeen–Kiselev black hole with the cosmological constant caused by Einstein equations coupled with nonlinear electrodynamics using quasinormal modes and greybody bounds 利用准正常模式和灰体边界探测由爱因斯坦方程与非线性电动力学耦合引起的具有宇宙常数的巴丁-基谢廖夫黑洞
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-05-12 DOI: 10.1088/1572-9494/ad3cc6
S R Wu, B Q Wang and Z W Long
{"title":"Probing the Bardeen–Kiselev black hole with the cosmological constant caused by Einstein equations coupled with nonlinear electrodynamics using quasinormal modes and greybody bounds","authors":"S R Wu, B Q Wang and Z W Long","doi":"10.1088/1572-9494/ad3cc6","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3cc6","url":null,"abstract":"In this work, we investigate a static and spherically symmetric Bardeen–Kiselev black hole (BH) with the cosmological constant, which is a solution of the Einstein-non-linear Maxwell field equations. We compute the quasinormal frequencies for the Bardeen–Kiselev BH with the cosmological constant due to electromagnetic and gravitational perturbations. By varying the BH parameters, we discuss the behavior of both real and imaginary parts of the BH quasinormal frequencies and compare these frequencies with the Reissner–Nordström–de Sitter BH surrounded by quintessence (RN-dSQ). Interestingly, it is shown that the responses of the Bardeen–Kiselev BH with the cosmological constant and the RN-dSQ under electromagnetic perturbations are different when the charge parameter q, the state parameter w and the normalization factor c are varied; however, for the gravitational perturbations, the responses of the Bardeen–Kiselev BH with the cosmological constant and the RN-dSQ are different only when the charge parameter q is varied. Therefore, compared with the gravitational perturbations, the electromagnetic perturbations can be used to understand nonlinear and linear electromagnetic fields in curved spacetime separately. Another interesting observation is that, due to the presence of Kiselev quintessence, the electromagnetic perturbations around the Bardeen–Kiselev BH with the cosmological constant damps faster and oscillates slowly; for the gravitational perturbations, the quasinormal mode decays slowly and oscillates slowly. We also study the reflection and transmission coefficients along with the absorption cross section in the Bardeen–Kiselev BH with the cosmological constant; it is shown that the transmission coefficients will increase due to the presence of Kiselev quintessence.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"40 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140933974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Multiple scales method for analyzing a forced damped rotational pendulum oscillator with gallows 分析带绞龙的受迫阻尼旋转摆振荡器的多尺度方法
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-05-01 DOI: 10.1088/1572-9494/ad3192
Haifa A Alyousef, Alvaro H Salas, B M Alotaibi and S A El-Tantawy
{"title":"Multiple scales method for analyzing a forced damped rotational pendulum oscillator with gallows","authors":"Haifa A Alyousef, Alvaro H Salas, B M Alotaibi and S A El-Tantawy","doi":"10.1088/1572-9494/ad3192","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3192","url":null,"abstract":"This study reports the analytical solution for a generalized rotational pendulum system with gallows and periodic excited forces. The multiple scales method (MSM) is applied to solve the proposed problem. Several types of rotational pendulum oscillators are studied and talked about in detail. These include the forced damped rotating pendulum oscillator with gallows, the damped standard simple pendulum oscillator, and the damped rotating pendulum oscillator without gallows. The MSM first-order approximations for all the cases mentioned are derived in detail. The obtained results are illustrated with concrete numerical examples. The first-order MSM approximations are compared to the fourth-order Runge–Kutta (RK4) numerical approximations. Additionally, the maximum error is estimated for the first-order approximations obtained through the MSM, compared to the numerical approximations obtained by the RK4 method. Furthermore, we conducted a comparative analysis of the outcomes obtained by the used method (MSM) and He-MSM to ascertain their respective levels of precision. The proposed method can be applied to analyze many strong nonlinear oscillatory equations.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"17 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140834199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Supermassive black holes triggered by QCD axion bubbles QCD轴突气泡引发的超大质量黑洞
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-05-01 DOI: 10.1088/1572-9494/ad3958
Hai-Jun Li, Ying-Quan Peng, Wei Chao and Yu-Feng Zhou
{"title":"Supermassive black holes triggered by QCD axion bubbles","authors":"Hai-Jun Li, Ying-Quan Peng, Wei Chao and Yu-Feng Zhou","doi":"10.1088/1572-9494/ad3958","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3958","url":null,"abstract":"Supermassive black holes (SMBHs) are ubiquitous in the center of galaxies, although the origin of their massive seeds is still unknown. In this paper, we investigate the formation of SMBHs from the quantum chromodynamics (QCD) axion bubbles. In this case, primordial black holes (PBHs) are considered as the seeds of SMBHs, which are generated from the QCD axion bubbles due to an explicit Peccei–Quinn (PQ) symmetry breaking after inflation. The QCD axion bubbles are formed when the QCD axion starts to oscillate during the QCD phase transition. We consider a general case in which the axion bubbles are formed with the bubble effective angle θeff ∈ (0, π], leading to the minimum PBH mass for the axion decay constant . The PBHs at this mass region may account for the seeds of SMBHs.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"147 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140834409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Asymmetric nucleation processes in spontaneous mode switch of active matter 活性物质自发模式转换中的不对称成核过程
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-04-21 DOI: 10.1088/1572-9494/ad3426
Bing Yang, 冰 杨, Yanting Wang and 延颋 王
{"title":"Asymmetric nucleation processes in spontaneous mode switch of active matter","authors":"Bing Yang, 冰 杨, Yanting Wang and 延颋 王","doi":"10.1088/1572-9494/ad3426","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3426","url":null,"abstract":"Flocking and vortical are two typical motion modes in active matter. Although it is known that the two modes can spontaneously switch between each other in a finite-size system, the switching dynamics remain elusive. In this work, by computer simulation of a two-dimensional Vicsek-like system with 1000 particles, we find from the perspective of the classical nucleation theory that the forward and backward switching dynamics are asymmetric: going from flocking to vortical is a one-step nucleation process, while the opposite is a two-step nucleation process, with the system staying in a metastable state before reaching the final flocking state.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"16 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140800348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Compensation temperatures and hysteresis behaviors of a graphene-like trilayer 类石墨烯三层膜的补偿温度和滞后行为
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-04-21 DOI: 10.1088/1572-9494/ad3220
Ying An, Ji Liang, Wei Wang, Mei-mei Du and Feng-ge Zhang
{"title":"Compensation temperatures and hysteresis behaviors of a graphene-like trilayer","authors":"Ying An, Ji Liang, Wei Wang, Mei-mei Du and Feng-ge Zhang","doi":"10.1088/1572-9494/ad3220","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3220","url":null,"abstract":"This work focuses on the ground-state phase diagram, the compensation temperatures and the critical behaviors of a ferrimagnetic graphene-like trilayer induced by crystal fields and exchange couplings. The simulation results show that a negative decrease in crystal field or an increase in exchange coupling can increase the critical temperature. More importantly, an M curve with double compensation temperatures can be observed, which is not predicted by the theory. This remarkable compensation phenomenon has potential application value in the field of magnetic recording.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"29 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140800349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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-particle spectroscopies of p-wave and d-wave interacting Bose gases in normal phase 正相中 p 波和 d 波相互作用玻色气体的单粒子光谱学
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-04-17 DOI: 10.1088/1572-9494/ad3543
Zeqing Wang, Ran Qi
{"title":"Single-particle spectroscopies of p-wave and d-wave interacting Bose gases in normal phase","authors":"Zeqing Wang, Ran Qi","doi":"10.1088/1572-9494/ad3543","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3543","url":null,"abstract":"Motivated by experiments with interacting quantum gases across high partial wave resonance, we investigate the thermodynamic properties and single-particle spectra of Bose gases in normal phase for different interaction strengths for both p- and d-wave interactions. The equation of state, contact density, momentum distributions and self-energies of single-particle Green’s functions are obtained in the spirit of ladder diagram approximations. The radio-frequency (RF) spectrum, as an important experimental approach for detecting Feshbach molecules or the interaction effect, is calculated at different temperatures. A reversed temperature dependence on the Bose–Einstein condensation side and Bardeen–Cooper–Schrieffer side is identified for both p- and d-wave interactions. An estimate for the signal of RF spectra under typical experimental conditions is also provided.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"439 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140608856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Learning topological defects formation with neural networks in a quantum phase transition 用神经网络学习量子相变中拓扑缺陷的形成
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-04-17 DOI: 10.1088/1572-9494/ad3227
Han-Qing Shi, Hai-Qing Zhang
{"title":"Learning topological defects formation with neural networks in a quantum phase transition","authors":"Han-Qing Shi, Hai-Qing Zhang","doi":"10.1088/1572-9494/ad3227","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3227","url":null,"abstract":"Neural networks possess formidable representational power, rendering them invaluable in solving complex quantum many-body systems. While they excel at analyzing static solutions, nonequilibrium processes, including critical dynamics during a quantum phase transition, pose a greater challenge for neural networks. To address this, we utilize neural networks and machine learning algorithms to investigate time evolutions, universal statistics, and correlations of topological defects in a one-dimensional transverse-field quantum Ising model. Specifically, our analysis involves computing the energy of the system during a quantum phase transition following a linear quench of the transverse magnetic field strength. The excitation energies satisfy a power-law relation to the quench rate, indicating a proportional relationship between the excitation energy and the kink numbers. Moreover, we establish a universal power-law relationship between the first three cumulants of the kink numbers and the quench rate, indicating a binomial distribution of the kinks. Finally, the normalized kink-kink correlations are also investigated and it is found that the numerical values are consistent with the analytic formula.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"16 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140608852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Nonclassical correlations in two-dimensional graphene lattices 二维石墨烯晶格中的非经典相关性
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-04-11 DOI: 10.1088/1572-9494/ad2d51
Hao Wang
{"title":"Nonclassical correlations in two-dimensional graphene lattices","authors":"Hao Wang","doi":"10.1088/1572-9494/ad2d51","DOIUrl":"https://doi.org/10.1088/1572-9494/ad2d51","url":null,"abstract":"We investigate nonclassical correlations via negativity, local quantum uncertainty (LQU) and local quantum Fisher information (LQFI) for two-dimensional graphene lattices. The explicitly analytical expressions for negativity, LQU and LQFI are given. The close forms of LQU and LQFI confirm the inequality between the quantum Fisher information and skew information, where the LQFI is always greater than or equal to the LQU, and both show very similar behavior with different amplitudes. Moreover, the effects of the different system parameters on the quantified quantum correlation are analyzed. The LQFI reveals more nonclassical correlations than LQU in a two-dimensional graphene lattice system.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"4 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140608857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Doped holographic superconductors in the Gubser–Rocha model 古布瑟-罗恰模型中的掺杂全息超导体
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-04-11 DOI: 10.1088/1572-9494/ad30f5
Ziyi Zhao, Wenhe Cai, Shuta Ishigaki
{"title":"Doped holographic superconductors in the Gubser–Rocha model","authors":"Ziyi Zhao, Wenhe Cai, Shuta Ishigaki","doi":"10.1088/1572-9494/ad30f5","DOIUrl":"https://doi.org/10.1088/1572-9494/ad30f5","url":null,"abstract":"We construct a doped holographic superconductor in the Gubser–Rocha model, and realize a superconducting dome in the middle of the temperature-doping phase diagram. It is worth noting that unlike in previous research, the profile of our dome shrinks inward near to zero temperature. From the numerical observation for the coupling dependence of the phase diagram, we find that the coupling between the two gauge fields plays a crucial role in the formation of the dome. We also analytically calculate the DC conductivity of the normal phase of the system in the momentum dissipation and obtain resistivity which is proportional to the temperature. The AC conductivity is calculated numerically.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"35 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140608854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
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