发布求助
文献互助 智能选刊 最新文献

APL Quantum最新文献

筛选
英文 中文
QED in space–time varying materials 时空变化材料中的 QED
APL Quantum Pub Date : 2024-04-10 DOI: 10.1063/5.0199503
J. Pendry, S. A. R. Horsley
{"title":"QED in space–time varying materials","authors":"J. Pendry, S. A. R. Horsley","doi":"10.1063/5.0199503","DOIUrl":"https://doi.org/10.1063/5.0199503","url":null,"abstract":"Space–time variation spoils frequency conservation and brings negative frequencies into the picture. In addition, the quantum nature of light comes to the fore in a manner not evident in static systems. Here, we explore the quantum structure of these systems; propose a Hamiltonian; show that, in the Heisenberg picture, quantum field operators evolve according to classical equations; and discuss the uniquely quantum phenomenon of photon-pair creation.","PeriodicalId":517678,"journal":{"name":"APL Quantum","volume":"107 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140719823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Applications of quantum circuit learning model using particle-number-conserving state on quantum chemical calculations 利用粒子数守恒态的量子回路学习模型在量子化学计算中的应用
APL Quantum Pub Date : 2024-04-10 DOI: 10.1063/5.0189832
Y. Nishida, F. Aiga
{"title":"Applications of quantum circuit learning model using particle-number-conserving state on quantum chemical calculations","authors":"Y. Nishida, F. Aiga","doi":"10.1063/5.0189832","DOIUrl":"https://doi.org/10.1063/5.0189832","url":null,"abstract":"Although the variational quantum eigensolver is a typical quantum algorithm utilized in near-term quantum devices, many measurements are required in an iterative closed feedback loop between the classical and quantum computers to obtain sufficient accuracy. In this study, we attempt to construct a quantum circuit learning model to infer potential energy surfaces and atomic forces without using the iterative loop to optimize parameters for every bond length. To realize a high, accurate inference performance, measurement is introduced in the middle of the circuit. When the proposed quantum circuit learning model is applied to the H2 molecule, the energies and atomic forces can be estimated with high accuracy in a single feed-forward calculation with varying bond lengths. A nonlinear relation between outcomes from data-encoding layer and inputs can also be used to eliminate the data-encoding layer, allowing for our quantum circuit model with lower learning costs by reducing the number of parameters to be optimized. Our model can be also extended to six-qubit systems, such as the H3 molecule, and to the water molecule with two internal degrees of freedom. Finally, we use the IBM Quantum backend to perform inference with a real quantum computer and show the effect of noise on the actual quantum device.","PeriodicalId":517678,"journal":{"name":"APL Quantum","volume":"415 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140719318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exceptional points unveiling quantum limit of fluorescence rates in non-Hermitian plexcitonic single-photon sources 揭示非赫米提双光子单光子源中荧光速率量子极限的例外点
APL Quantum Pub Date : 2024-03-01 DOI: 10.1063/5.0191494
Wenjie Zhou, Jingfeng Liu, Juanfeng Zhu, Dmitrii Gromyko, Cheng-wei Qiu, Lin Wu
{"title":"Exceptional points unveiling quantum limit of fluorescence rates in non-Hermitian plexcitonic single-photon sources","authors":"Wenjie Zhou, Jingfeng Liu, Juanfeng Zhu, Dmitrii Gromyko, Cheng-wei Qiu, Lin Wu","doi":"10.1063/5.0191494","DOIUrl":"https://doi.org/10.1063/5.0191494","url":null,"abstract":"Single-photon sources based on plexcitonic systems are notable for their fast fluorescence rates, typically >100 GHz. Our investigations reveal that exceptional points (EPs) may unveil the quantum limit of fluorescence rates in plexcitonic single-photon sources. By employing a non-Hermitian Hamiltonian framework and field quantization model, we demonstrate how the fluorescence rate can be ingeniously designed in an exemplified plexcitonic system consisting of a nanocube-on-mirror cavity and a single quantum emitter. We predict the highest fluorescence rates of 11.0, 13.9, and 14.7 THz at the EPs with typical dipole moments of 25, 30, and 35 D, respectively.","PeriodicalId":517678,"journal":{"name":"APL Quantum","volume":"229 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140286896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mathematical definition of the fine-structure constant: A clue for fundamental couplings in astrophysics 精细结构常数的数学定义：天体物理学基本耦合的线索
APL Quantum Pub Date : 2024-03-01 DOI: 10.1063/5.0200259
Gilbert Reinisch
{"title":"Mathematical definition of the fine-structure constant: A clue for fundamental couplings in astrophysics","authors":"Gilbert Reinisch","doi":"10.1063/5.0200259","DOIUrl":"https://doi.org/10.1063/5.0200259","url":null,"abstract":"Astrophysical tests of the stability—or not—of fundamental couplings (e.g., can the numerical value ∼1/137 of the fine-structure constant α = e2/ℏc vary with astronomical time?) are a very active area of observational research. Using a specific α-free non-relativistic and nonlinear isotropic quantum model compatible with its quantum electrodynamics (QED) counterpart yields the 99% accurate solution α = 7.364 × 10−3 vs its experimental value 7.297 × 10−3. The ∼1% error is due to the deliberate use of mean-field Hartree approximation involving lowest-order QED in the calculations. The present theory has been checked by changing the geometry of the model. Moreover, it fits the mathematical solution of the original nonlinear integro-differential Hartree system by use of a rapidly convergent series of nonlinear eigenstates [G. Reinisch, Phys. Lett. A 498, 129347 (2024)]. These results strongly suggest the mathematical transcendental nature—e.g., like for π or e—of α’s numerical value of ∼1/137 and, hence, its astrophysical as well as its cosmological stability.","PeriodicalId":517678,"journal":{"name":"APL Quantum","volume":"984 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140286437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Possibility of massless Dirac fermions in an Aubry–André–Harper potential 奥布里-安德烈-哈珀势中无质量狄拉克费米子的可能性
APL Quantum Pub Date : 2024-03-01 DOI: 10.1063/5.0191081
M. Cruz-Méndez, H. Cruz
{"title":"Possibility of massless Dirac fermions in an Aubry–André–Harper potential","authors":"M. Cruz-Méndez, H. Cruz","doi":"10.1063/5.0191081","DOIUrl":"https://doi.org/10.1063/5.0191081","url":null,"abstract":"In this study, we present a one-dimensional tight-binding model designed to explore the impact of electric fields on an incommensurate quantum system. We specifically focus on the Aubry–André–Harper model, a quasiperiodic model known to exhibit a metal–insulator transition at a critical potential value of λc = 2. This model combines Anderson and Aubry–André–Harper localization phenomena in a quantum system, leading to intriguing effects on the lattice band structure upon the application of an electric field F to the Aubry–André–Harper potential. Our investigation reveals that by choosing a specific value for the applied electric field, it becomes feasible to generate effective massless Dirac fermions within our Aubry–André–Harper system. Furthermore, we note that the extension or localization of the massless particle wave function is contingent upon the potential strength value λ within our incommensurate model. Importantly, our findings highlight the potential for detecting this intriguing phenomenon through experimental means.","PeriodicalId":517678,"journal":{"name":"APL Quantum","volume":"176 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140405089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Memory-induced weak dissipation in fractional-time-derivative quantum Lindblad-based model 基于分数时间导数的量子林德布拉德模型中的记忆诱导弱耗散
APL Quantum Pub Date : 2024-03-01 DOI: 10.1063/5.0194452
C. Kee, L. K. Ang
{"title":"Memory-induced weak dissipation in fractional-time-derivative quantum Lindblad-based model","authors":"C. Kee, L. K. Ang","doi":"10.1063/5.0194452","DOIUrl":"https://doi.org/10.1063/5.0194452","url":null,"abstract":"Modeling the interaction between a quantum system and its environment is crucial for practical quantum technologies. The Lindblad master equation is the simplest equation to understand this interaction. In this paper, we have extended the traditional Lindblad equation by fractionalizing its time derivative to account for the memory-induced dissipation. Using this approach, we show weak dissipation of selected quantum systems can be reproduced by this proposed time-fractional Lindblad equation without introducing any specific dissipation terms in the model. By varying the order of the time-fractional Lindblad equation without dissipation terms, we can reproduce the results with good agreements to three tested cases: (a) dissipative Rabi oscillation, (b) dissipative Ising model, and (c) collapse and revival in the Jaynes–Cumming model. We believe this proposed time-fractional Lindblad equation may be a useful modeling tool to characterize weakly dissipative quantum systems in practical quantum technologies, especially if the complex dissipation mechanism is not completely known from the traditional approaches.","PeriodicalId":517678,"journal":{"name":"APL Quantum","volume":"101 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140405553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Time-reversible and fully time-resolved ultra-narrowband biphoton frequency combs 时间可逆和完全时间分辨超窄带双光子频率梳
APL Quantum Pub Date : 2024-02-23 DOI: 10.1063/5.0180543
Kaishuo Chang, Xiang Cheng, M. Sarihan, Chee Wei Wong
{"title":"Time-reversible and fully time-resolved ultra-narrowband biphoton frequency combs","authors":"Kaishuo Chang, Xiang Cheng, M. Sarihan, Chee Wei Wong","doi":"10.1063/5.0180543","DOIUrl":"https://doi.org/10.1063/5.0180543","url":null,"abstract":"Time-reversibility, which is inherent in many physical systems, is crucial in tailoring temporal waveforms for optimum light–matter interactions. Among the time-reversible atomic systems, narrowband biphoton sources are essential for efficient quantum storage. In this work, we demonstrate time-reversed and fully time-resolved ultra-narrowband single-sided biphoton frequency combs with an average free-spectral range (FSR) of 42.66 MHz and an average linewidth of 4.60 MHz in the telecommunication band. We experimentally observe the fully time-resolved and reversible temporal oscillations by second-order cross correlation and joint temporal intensity measurements. The potential benefits of the time-reversed and fully time-resolved temporal oscillations from our source include enhancing the efficiency of quantum storage in atomic memories and maximizing the utilization of temporal information in multimode biphoton frequency combs. We further verify the heralded single-photon state generation from the multimode biphoton frequency combs by using Hanbury Brown and Twiss interference measurements. To the best of our knowledge, this 42.66 MHz FSR of our photon-pair source represents the narrowest among all of the different configurated biphoton sources reported to date. This ultra-narrow FSR and its 4.60 MHz linewidth provide the highest frequency mode number of 5786 and the longest coherence time among all the singly configurated biphoton sources so far. Our time-reversed and fully time-resolved massive-mode biphoton source could be useful for high-dimensional quantum information processing and efficient time–frequency multiplexed quantum storage toward long-distance and large-scale quantum networks.","PeriodicalId":517678,"journal":{"name":"APL Quantum","volume":"225 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Welcome toAPL Quantum: From “science is quantum” to “quantum is science and technology” 欢迎访问 APL Quantum：从 "科学就是量子 "到 "量子就是科学技术"
APL Quantum Pub Date : 2024-02-23 DOI: 10.1063/5.0202749
Ortwin Hess
{"title":"Welcome to\u0000APL Quantum\u0000: From “science is quantum” to “quantum is science and technology”","authors":"Ortwin Hess","doi":"10.1063/5.0202749","DOIUrl":"https://doi.org/10.1063/5.0202749","url":null,"abstract":"","PeriodicalId":517678,"journal":{"name":"APL Quantum","volume":"51 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Partially reflecting jamming objects in correlation-enhanced target detection with entangled photons 利用纠缠光子进行相关性增强目标探测时的部分反射干扰物体
APL Quantum Pub Date : 2024-02-23 DOI: 10.1063/5.0162419
V. V. Kornienko, C. Vidal, A. Pönni, M. Raasakka, I. Tittonen
{"title":"Partially reflecting jamming objects in correlation-enhanced target detection with entangled photons","authors":"V. V. Kornienko, C. Vidal, A. Pönni, M. Raasakka, I. Tittonen","doi":"10.1063/5.0162419","DOIUrl":"https://doi.org/10.1063/5.0162419","url":null,"abstract":"In the optical detection of distant objects, one can benefit from quantum light properties over those of classical light. Two-beam correlation-enhanced protocols can improve imaging or target detection even under strong background noise and in the low photon flux regime. We demonstrate that a partially reflecting jamming object introduces noise to these protocols, including quantum illumination. In contrast to background noise, the signal radiation reflected from the jammer is correlated with the corresponding idler beam. We analyze the means to mitigate this noise and introduce an indistinguishability parameter μ, showing how efficiently the jammer can be distinguished from the target. We use the quantum Chernoff bound and the density matrix orthogonalization procedure to separate the contributions from the target, the background, and the jammer. We illustrate our findings with an experiment using optical entangled photon pairs at 800 nm. Our results can be applied to the design of target detection protocols and advanced imaging techniques.","PeriodicalId":517678,"journal":{"name":"APL Quantum","volume":"127 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140438368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信
小红书