Physical Review A最新文献_第5页

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

引用次数: 0

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

引用次数: 0

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

Creating dynamic leakage-free paths using coarse-graining techniques in the presence of decoherence 在存在退相干的情况下利用粗粒度技术创建动态无泄漏路径

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-13 DOI: 10.1103/physreva.110.032212

S. L. Wu, W. Ma, Lian-Ao Wu

引用次数: 0

Robust two-qubit gate with reinforcement learning and dropout 具有强化学习和辍学功能的稳健双量子比特门

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-13 DOI: 10.1103/physreva.110.032614

Tian-Niu Xu, Yongcheng Ding, José D. Martín-Guerrero, Xi Chen

引用次数: 0

Long-lived coherences in strongly interacting spin ensembles 强相互作用自旋集合中的长效一致性

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-12 DOI: 10.1103/physreva.110.032612

William K. Schenken, Simon A. Meynell, Francisco Machado, Bingtian Ye, Claire A. McLellan, Maxime Joos, V. V. Dobrovitski, Norman Y. Yao, Ania C. Bleszynski Jayich

{"title":"Long-lived coherences in strongly interacting spin ensembles","authors":"William K. Schenken, Simon A. Meynell, Francisco Machado, Bingtian Ye, Claire A. McLellan, Maxime Joos, V. V. Dobrovitski, Norman Y. Yao, Ania C. Bleszynski Jayich","doi":"10.1103/physreva.110.032612","DOIUrl":"https://doi.org/10.1103/physreva.110.032612","url":null,"abstract":"Periodic driving has emerged as a powerful tool to control, engineer, and characterize many-body quantum systems. However, the required pulse sequences are often complex, long, or require the ability to control the individual degrees of freedom. In this work, we study how a simple Carr-Purcell–Meiboom-Gill (CPMG)-like pulse sequence can be leveraged to enhance the coherence of a large ensemble of spin qubits and serve as an important characterization tool. We implement the periodic drive on an ensemble of dense nitrogen-vacancy (NV) centers in diamond and examine the effect of pulse rotation offset as a control parameter on the dynamics. We use a single diamond sample prepared with several spots of varying NV density, which, in turn, varies the NV-NV dipolar interaction strength. Counterintuitively, we find that rotation offsets deviating from the ideal <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>π</mi></math> pulse in the CPMG sequence (often classified as pulse errors) play a critical role in preserving coherence along an axis set by the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>π</mi></math> pulses even at nominally zero rotation offset. The cause of the coherence preservation is an emergent effective field that scales linearly with the magnitude of the rotation offset for small offsets. In addition to extending coherence, we compare the rotation offset dependence of coherence to numerical simulations to measure the disorder and dipolar contributions to the Hamiltonian to quantitatively extract the densities of the constituent spin species within the diamond.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"404 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205850","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 resource theory of coding for error correction 纠错编码的量子资源理论

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-12 DOI: 10.1103/physreva.110.032413

Dong-Sheng Wang, Yuan-Dong Liu, Yun-Jiang Wang, Shunlong Luo

引用次数: 0

Quantum battery with interactive atomic collective charging 交互式原子集体充电量子电池

IF 2.9 2区物理与天体物理

Physical Review A Pub Date : 2024-09-12 DOI: 10.1103/physreva.110.032211

Dayang Zhang, Shuangquan Ma, Yunxiu Jiang, Youbin Yu, Guangri Jin, Aixi Chen

引用次数: 0