Physical Review A最新文献_第7页

Noise-induced coherent ergotropy of a quantum heat engine 量子热机的噪声诱导相干各向异性

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-16 DOI: 10.1103/physreva.110.032213

Manash Jyoti Sarmah, Himangshu Prabal Goswami

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Generation of high-order harmonics with hybrid spin and transverse orbital angular momentum from a crystalline solid 从晶体固体中产生具有混合自旋和横向轨道角动量的高阶谐波

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-16 DOI: 10.1103/physreva.110.033110

Jianing Zhang, Zijian Lyu, Lei Geng, Xiulan Liu, Yunquan Liu, Liang-You Peng

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Two ultracold atoms in a quasi-two-dimensional box confinement 准二维盒约束中的两个超冷原子

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-16 DOI: 10.1103/physreva.110.033318

Fan Yang, Ruijie Du, Ran Qi, Peng Zhang

{"title":"Two ultracold atoms in a quasi-two-dimensional box confinement","authors":"Fan Yang, Ruijie Du, Ran Qi, Peng Zhang","doi":"10.1103/physreva.110.033318","DOIUrl":"https://doi.org/10.1103/physreva.110.033318","url":null,"abstract":"We investigate the scattering and two-body bound states of two ultracold atoms in a quasi-two-dimensional (quasi-2D) confinement, with the confinement potential being an infinitely deep square well (box potential) in the transverse (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>z</mi></math>) direction, and the motion of the atoms in the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>x</mi><mtext>−</mtext><mi>y</mi></mrow></math> plane being free. Specifically, we calculate the effective 2D scattering length and 2D effective range parameter of the low-energy scattering, as well as the energy and the transverse-excited-mode probability of the bound states. Comparing these results with those obtained under a harmonic transverse confinement potential, which has the same characteristic length as the box potential, we find that in most of the cases the 2D effective range parameter for the box confinement is approximately 0.28 of the one for the harmonic confinement. Moreover, the transverse-excited-mode probability of the bound states for the box confinement is also much lower than the one for the harmonic confinement. These results suggest that the transverse excitation in the box confinement is notably weaker than the one in the harmonic confinement with the same characteristic length. Therefore, achieving quasi-2D ultracold gases well described by pure-2D effective models, particularly those with 2D contact interaction, is more feasible through box confinement. Our results are helpful for the quantum simulation of 2D many-body physics with ultracold atoms, e.g., the suppression of 2D effective range parameter may lead to an enhancement of quantum anomaly in two-dimensional Fermi gases. Additionally, our calculation method is applicable to the two-body problems of ultracold atoms in other types of quasi-2D confinements.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"48 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262930","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

Machine-learning models for atom-diatom reactions across isotopologues 跨同位素原子-原子反应的机器学习模型

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-16 DOI: 10.1103/physreva.110.032811

Daniel Julian, Rian Koots, Jesús Pérez-Ríos

{"title":"Machine-learning models for atom-diatom reactions across isotopologues","authors":"Daniel Julian, Rian Koots, Jesús Pérez-Ríos","doi":"10.1103/physreva.110.032811","DOIUrl":"https://doi.org/10.1103/physreva.110.032811","url":null,"abstract":"This work shows that feed-forward neural networks can predict the final rovibrational state distributions of inelastic and reactive processes of the reaction of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Ca</mi><mo>+</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><mo>→</mo><mi>CaH</mi><mo>+</mo><mi mathvariant=\"normal\">H</mi></mrow></math> in the hyperthermal regime, relevant for buffer gas chemistry. Furthermore, these models can be extended to the isotopologues of the reaction involving deuterium and tritium. In addition, we develop a neural network model that can learn across the chemical space based on the isotopologues of hydrogen. The model can predict the outcome of a reaction whose reactants have never been seen. This is done by training on the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Ca</mi><mo>+</mo><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub></mrow></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Ca</mi><mo>+</mo><msub><mi mathvariant=\"normal\">T</mi><mn>2</mn></msub></mrow></math> reactions and subsequently predicting the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Ca</mi><mo>+</mo><msub><mi mathvariant=\"normal\">D</mi><mn>2</mn></msub></mrow></math> reaction.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"25 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262936","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

Generation of vortex electrons in tunneling ionization of polyatomic molecules: Exact results in the zero-range potential model 多原子分子隧道电离中涡旋电子的产生：零电势模型的精确结果

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-13 DOI: 10.1103/physreva.110.033107

Kirill V. Bazarov, Oleg I. Tolstikhin

{"title":"Generation of vortex electrons in tunneling ionization of polyatomic molecules: Exact results in the zero-range potential model","authors":"Kirill V. Bazarov, Oleg I. Tolstikhin","doi":"10.1103/physreva.110.033107","DOIUrl":"https://doi.org/10.1103/physreva.110.033107","url":null,"abstract":"The theory of molecular Siegert states in a static electric field in the zero-range potential model is developed. The model admits extended analytical and accurate numerical treatments, which enables one to study tunneling ionization of large polyatomic molecules with complex geometry in strong fields beyond the weak-field approximation. The theory is illustrated by calculations for three model molecules reproducing the geometry of the real water, benzene, and leucine molecules. The field and orientation dependence of two major ionization observables, the ionization rate and the transverse momentum distribution of liberated electrons, is analyzed. The calculations reveal a number of strong-field effects not accounted for by the weak-field asymptotic theory. In particular, it is shown that vortex electrons are efficiently generated in tunneling ionization of large molecules at sufficiently strong fields, which opens a perspective for enantiosensitive rescattering photoelectron spectroscopy. The mechanism of tunneling-induced electron diffraction and its manifestation in the transverse momentum distribution are discussed.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"40 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262620","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

Coulomb effects on strong-field ionization of stretched H2+ 拉伸 H2+ 强场电离的库仑效应

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-13 DOI: 10.1103/physreva.110.033106

S. Q. Shen, Z. Y. Chen, S. Wang, J. Y. Che, Y. J. Chen

{"title":"Coulomb effects on strong-field ionization of stretched H2+","authors":"S. Q. Shen, Z. Y. Chen, S. Wang, J. Y. Che, Y. J. Chen","doi":"10.1103/physreva.110.033106","DOIUrl":"https://doi.org/10.1103/physreva.110.033106","url":null,"abstract":"We numerically and analytically study ionization of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msup><mrow></mrow><mo>+</mo></msup></mrow></math> with large internuclear distances <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>R</mi></math> in strong elliptically polarized laser fields. Numerical simulations show that the offset angle in the photoelectron momentum distribution (PMD) is larger for cases of large <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>R</mi></math> than for cases of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msup><mrow></mrow><mo>+</mo></msup></mrow></math> with small <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>R</mi></math> and model atoms with similar ionization potentials. In addition, the PMDs for cases of large <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>R</mi></math> show clear interference patterns which disappear for cases of small <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>R</mi></math>. By developing a strong-field model which includes the contributions of the first excited state and the Coulomb potential, we reproduce the phenomena for large <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>R</mi></math>. Tunneling ionization of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub><msup><mrow></mrow><mo>+</mo></msup></mrow></math> with large <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>R</mi></math> involves a complex four-body interaction between the laser, the electron, and the two nuclei. Our model can approximate the four-body interaction as the three-body one and clearly identify the effects of charge resonance and different nuclei on tunneling ionization. Our work suggests a manner for probing complex interactions in strong-field ionization of stretched molecules with high time resolution.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"57 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205854","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

Phase entanglement negativity for bipartite fermionic systems 双方费米子系统的相纠缠负性

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-13 DOI: 10.1103/physreva.110.032417

Bing Xu, Xiaofei Qi, Jinchuan Hou

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Quantum aggregation with temporal delay 有时间延迟的量子聚合

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-13 DOI: 10.1103/physreva.110.032613

Nicolò Lo Piparo, William J. Munro, Kae Nemoto

{"title":"Quantum aggregation with temporal delay","authors":"Nicolò Lo Piparo, William J. Munro, Kae Nemoto","doi":"10.1103/physreva.110.032613","DOIUrl":"https://doi.org/10.1103/physreva.110.032613","url":null,"abstract":"Advanced quantum networking systems rely on efficient quantum error correction codes for their optimal realization. The rate at which the encoded information is transmitted is a fundamental limit that affects the performance of such systems. Quantum aggregation allows one to increase the transmission rate by adding multiple paths connecting two distant users. Aggregating channels of different paths allows more users to simultaneously exchange the encoded information. Recent work has shown that quantum aggregation can also reduce the number of physical resources of an error correction code when it is combined with the quantum multiplexing technique. However, the difference in channel lengths across the various paths means some of the encoded quantum information will arrive earlier than others and it must be stored in quantum memories. The information stored will then deteriorate due to decoherence processes leading to detrimental effects for the fidelity of the final quantum state. Here, we explore the effects of a depolarization channel that occurs for the quantum Reed-Solomon code when quantum aggregation involving different channel lengths is used. We determine the best distribution of resources among the various channels connecting two remote users. Furthermore, we estimate the coherence time required to achieve a certain fidelity. Our results will have a significant impact on the ways physical resources are distributed across a quantum network.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"49 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205849","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

Quantum Hopfield model with dilute memories 具有稀释记忆的量子霍普菲尔德模型

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-13 DOI: 10.1103/physreva.110.032418

Rongfeng Xie, Alex Kamenev

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Relativistic and spin-orbit dynamics at nonrelativistic intensities in strong-field ionization 强场电离非相对论强度下的相对论动力学和自旋轨道动力学

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-13 DOI: 10.1103/physreva.110.033108

Andrew S. Maxwell, Lars Bojer Madsen

{"title":"Relativistic and spin-orbit dynamics at nonrelativistic intensities in strong-field ionization","authors":"Andrew S. Maxwell, Lars Bojer Madsen","doi":"10.1103/physreva.110.033108","DOIUrl":"https://doi.org/10.1103/physreva.110.033108","url":null,"abstract":"Spin-orbit dynamics and relativistic corrections to the kinetic energy in strong-field dynamics have long been ignored for near- and mid-infrared fields with intensities <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msup><mn>10</mn><mn>13</mn></msup><mtext>–</mtext><msup><mn>10</mn><mn>14</mn></msup><mspace width=\"0.28em\"></mspace><mi mathvariant=\"normal\">W</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mn>2</mn></msup></mrow></math>, as the final photoelectron energies are considered too low for these effects to play a role. However, using a precise and flexible path-integral formalism, we include all correction terms from the fine-structure, Breit-Pauli Hamiltonian. This enables a treatment of spin, through coherent spin states, which is the first model to use this approach in strong-field physics. We are able to show that the most energetically rescattered wave packets are effected by relativistic kinetic energy corrections during rescattering. We probe these effects and show that they yield notable differences for a 1600-nm wavelength laser field on the dynamics and the photoelectron spectra. Furthermore, we find that the dynamical spin-orbit coupling is strongly overestimated if relativistic corrections to kinetic energy are not considered. Finally, we derive a new condition that demonstrates that relativistic effects begin to play a role at intensities many orders of magnitude lower than expected for the case of rescatterering. Our findings may have important implications for imaging processes such as laser-induced electron diffraction, which includes high-energy photoelectron recollisions.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"27 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262621","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