New Journal of Physics最新文献_第7页

Manipulating a beam of barium fluoride molecules using an electrostatic hexapole 利用静电六极操纵氟化钡分子束

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-08-01 DOI: 10.1088/1367-2630/ad60ee

A Touwen, J W F van Hofslot, T Qualm, R Borchers, R Bause, H L Bethlem, A Boeschoten, A Borschevsky, T H Fikkers, S Hoekstra, K Jungmann, V R Marshall, T B Meijknecht, M C Mooij, R G E Timmermans, W Ubachs, L Willmann, NL-eEDM collaboration

{"title":"Manipulating a beam of barium fluoride molecules using an electrostatic hexapole","authors":"A Touwen, J W F van Hofslot, T Qualm, R Borchers, R Bause, H L Bethlem, A Boeschoten, A Borschevsky, T H Fikkers, S Hoekstra, K Jungmann, V R Marshall, T B Meijknecht, M C Mooij, R G E Timmermans, W Ubachs, L Willmann, NL-eEDM collaboration","doi":"10.1088/1367-2630/ad60ee","DOIUrl":"https://doi.org/10.1088/1367-2630/ad60ee","url":null,"abstract":"An electrostatic hexapole lens is used to manipulate the transverse properties of a beam of barium fluoride molecules from a cryogenic buffer gas source. The spatial distribution of the beam is measured by recording state-selective laser-induced fluorescence on an <sc>emccd</sc> camera, providing insight into the intensity and transverse position spread of the molecular beam. Although the high mass and unfavorable Stark shift of barium fluoride pose a considerable challenge, the number of molecules in the low-field seeking component of the <italic toggle=\"yes\">N</italic> = 1 state that pass a 4 mm diameter aperture 712 mm behind the source is increased by a factor of 12. Furthermore, it is demonstrated that the molecular beam can be displaced by up to ±5 mm by moving the hexapole lens. Our measurements agree well with numerical trajectory simulations. We discuss how electrostatic lenses may be used to increase the sensitivity of beam experiments such as the search for the electric dipole moment of the electron.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"32 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866839","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

Adaptive quantum accelerated imaging for space domain awareness 用于空间领域感知的自适应量子加速成像技术

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-08-01 DOI: 10.1088/1367-2630/ad668c

Hyunsoo Choi, Fanglin Bao, Zubin Jacob

{"title":"Adaptive quantum accelerated imaging for space domain awareness","authors":"Hyunsoo Choi, Fanglin Bao, Zubin Jacob","doi":"10.1088/1367-2630/ad668c","DOIUrl":"https://doi.org/10.1088/1367-2630/ad668c","url":null,"abstract":"The growth in space activity has increased the need for Space Domain Awareness (SDA) to ensure safe space operations. Imaging and detecting space targets is, however, challenging due to their dim appearance, small angular size/separation, dense distribution, and atmospheric turbulence. These challenges render space targets in ground-based imaging observations as point-like objects in the sub-Rayleigh regime, with extreme brightness contrast but a low photon budget. Here, we propose to use the recently developed quantum-accelerated imaging (QAI) for the SDA challenge. We mainly focus on three SDA challenges (1) minimal <italic toggle=\"yes\">a priori</italic> assumptions (2) many-object problem (3) extreme brightness ratio. We also present results on source estimation and localization in the presence of atmospheric turbulence. QAI shows significantly improved estimation in position, brightness, and number of targets for all SDA challenges. In particular, we demonstrate up to 2.5 times better performance in source detection than highly optimized direct imaging in extreme scenarios like stars with a 1000 times brightness ratio. With over 10 000 simulations, we verify the increased resolution of our approach compared to conventional state-of-the-art direct imaging paving the way towards quantum optics approaches for SDA.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"2 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866841","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

Unbending strategies shepherd cooperation and suppress extortion in spatial populations 不屈不挠的策略在空间种群中引导合作并抑制勒索

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-31 DOI: 10.1088/1367-2630/ad668b

Zijie Chen, Yuxin Geng, Xingru Chen, Feng Fu

{"title":"Unbending strategies shepherd cooperation and suppress extortion in spatial populations","authors":"Zijie Chen, Yuxin Geng, Xingru Chen, Feng Fu","doi":"10.1088/1367-2630/ad668b","DOIUrl":"https://doi.org/10.1088/1367-2630/ad668b","url":null,"abstract":"Evolutionary game dynamics on networks typically consider the competition among simple strategies such as cooperation and defection in the Prisoner’s Dilemma and summarize the effect of population structure as network reciprocity. However, it remains largely unknown regarding the evolutionary dynamics involving multiple powerful strategies typically considered in repeated games, such as the zero-determinant (ZD) strategies that are able to enforce a linear payoff relationship between them and their co-players. Here, we consider the evolutionary dynamics of always cooperate (AllC), extortionate ZD (extortioners), and unbending players in lattice populations based on the commonly used death-birth updating. Out of the class of unbending strategies that can foster reciprocal cooperation and fairness among extortionate players, we consider a particular candidate, pre-optimized through the machine-learning method of particle swarm optimization (PSO), called PSO Gambler. We derive analytical results under weak selection and rare mutations, including pairwise fixation probabilities and long-term frequencies of strategies. In the absence of the third unbending type, extortioners can achieve a half-half split in equilibrium with unconditional cooperators for sufficiently large extortion factors. However, the presence of unbending players fundamentally changes the dynamics and tilts the system to favor unbending cooperation. Most surprisingly, extortioners cannot dominate at all regardless of how large their extortion factor is, and the long-term frequency of unbending players is maintained almost as a constant. Our analytical method is applicable to studying the evolutionary dynamics of multiple strategies in structured populations. Our work provides insights into the interplay between network reciprocity and direct reciprocity, revealing the role of unbending strategies in enforcing fairness and suppressing extortion.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"11 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866912","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

Exact moments for trapped active particles: inertial impact on steady-state properties and re-entrance 被困活性粒子的精确力矩：惯性对稳态特性和再入口的影响

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-31 DOI: 10.1088/1367-2630/ad6349

Manish Patel, Debasish Chaudhuri

引用次数: 0

Laser powered dissipative quantum batteries in atom-cavity QED 原子腔 QED 中的激光驱动耗散量子电池

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-31 DOI: 10.1088/1367-2630/ad6348

Zamir Beleño, Marcelo F Santos, Felipe Barra

{"title":"Laser powered dissipative quantum batteries in atom-cavity QED","authors":"Zamir Beleño, Marcelo F Santos, Felipe Barra","doi":"10.1088/1367-2630/ad6348","DOIUrl":"https://doi.org/10.1088/1367-2630/ad6348","url":null,"abstract":"The interaction of a three-level atom with the electromagnetic field of a quantum cavity in the presence of a laser field presents a rich behavior in the dispersive regime that we exploit to discuss two quantum batteries. In the first setup, we consider a single three-level atom interacting sequentially with many cavities, each in a thermal state. We show that under this process, the atom converges towards an equilibrium state that displays population inversion. In the second setup, a stream of atoms in a thermal state interacts sequentially with a single cavity initially in a thermal state at the same temperature as the atoms. We show that the cavity’s energy increases continuously as the stream of atoms continues to cross, and the cavity does not reach an equilibrium state. After many atoms have traveled, the cavity’s state becomes active, storing extractable energy that increases in proportion to the work done by the laser. However, the same dynamics may involve only two cavity levels in an interesting limit called the highly selective regime. In that regime, the cavity reaches an equilibrium state similar to the one of the atom in the first scenario. The charging process we propose is robust. We discuss its thermodynamics and evaluate the energy supplied by the laser, the energy stored in the battery, and, thus, the device’s efficiency. We also analyze the role of damping.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"207 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866842","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

Helical close-packing of anisotropic tubes 各向异性管的螺旋紧密堆积

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-30 DOI: 10.1088/1367-2630/ad620a

Benjamin R Greenvall, Gregory M Grason

{"title":"Helical close-packing of anisotropic tubes","authors":"Benjamin R Greenvall, Gregory M Grason","doi":"10.1088/1367-2630/ad620a","DOIUrl":"https://doi.org/10.1088/1367-2630/ad620a","url":null,"abstract":"Helically close-packed states of filaments are common in natural and engineered material systems, ranging from nanoscopic biomolecules to macroscopic structural components. While the simplest models of helical close-packing, described by the <italic toggle=\"yes\">ideal rope model</italic>, neglect anisotropy perpendicular to the backbone, physical filaments are often quite far from circular in their cross-section. Here, we consider an anisotropic generalization of the ideal rope model and show that cross-section anisotropy has a strongly non-linear impact on the helical close-packing configurations of helical filaments. We show that the topology and composition of the close-packing landscape depends on the cross-sectional aspect ratio and is characterized by several distinct states of self-contact. We characterize the local density of these distinct states based on the notion of confinement within a ‘virtual’ cylindrical capillary, and show that states of optimal density vary strongly with the degree of anisotropy. While isotropic filaments are densest in a straight configuration, any measure of anisotropy leads to helicity of the maximal density state. We show the maximally dense states exhibit a sequence of transitions in helical geometry and cross-sectional tilt with increasing anisotropy, from <italic toggle=\"yes\">spiral tape</italic> to <italic toggle=\"yes\">spiral screw</italic> packings. Furthermore, we show that maximal capillary density saturates in a lower bound for volume fraction of <inline-formula>\u0000<tex-math><?CDATA $pi/4$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mi>π</mml:mi><mml:mrow><mml:mo>/</mml:mo></mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"njpad620aieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> in the large-anisotropy, spiral-screw limit. While cross-sectional anisotropy is well-known to impact the mechanical properties of filaments, our study shows its strong effects to shape the configuration space and packing efficiency of this elementary material motif.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"28 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866913","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

Photon discerner: adaptive quantum optical sensing near the shot noise limit 光子识别器：接近射出噪声极限的自适应量子光学传感

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-30 DOI: 10.1088/1367-2630/ad6584

Fanglin Bao, Leif Bauer, Adrián E Rubio López, Ziyi Yang, Xueji Wang, Zubin Jacob

{"title":"Photon discerner: adaptive quantum optical sensing near the shot noise limit","authors":"Fanglin Bao, Leif Bauer, Adrián E Rubio López, Ziyi Yang, Xueji Wang, Zubin Jacob","doi":"10.1088/1367-2630/ad6584","DOIUrl":"https://doi.org/10.1088/1367-2630/ad6584","url":null,"abstract":"Photon statistics of an optical field can be used for quantum optical sensing in low light level scenarios free of bulky optical components. However, photon-number-resolving detection to unravel the photon statistics is challenging. Here, we propose a novel detection approach, that we call ‘photon discerning’, which uses adaptive photon thresholding for photon statistical estimation without recording exact photon numbers. Our photon discerner is motivated by the field of neural networks where tunable thresholds have proven efficient for information extraction in machine learning tasks. The photon discerner maximizes Fisher information per photon by iteratively choosing the optimal threshold in real-time to approach the shot noise limit. Our proposed scheme of adaptive photon thresholding leads to unique remote-sensing applications of quantum degree of linear polarization camera and quantum LiDAR. We investigate optimal thresholds and show that the optimal photon threshold can be counter-intuitive (not equal to 1) even for weak signals (mean photon number much less than 1), due to the photon bunching effect. We also put forth a superconducting nanowire realization of the photon discerner which can be experimentally implemented in the near-term. We show that the adaptivity of our photon discerner enables it to beat realistic photon-number-resolving detectors with limited photon-number resolution in certain applications. Our work suggests a new class of detectors for information-theory driven, compact, and learning-based quantum optical sensing.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"11 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866914","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

Single entanglement connection architecture between multi-layer bipartite hardware efficient ansatz 多层二方硬件之间的单纠缠连接架构高效解析

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-25 DOI: 10.1088/1367-2630/ad64fb

Shikun Zhang, Zheng Qin, Yang Zhou, Rui Li, Chunxiao Du and Zhisong Xiao

{"title":"Single entanglement connection architecture between multi-layer bipartite hardware efficient ansatz","authors":"Shikun Zhang, Zheng Qin, Yang Zhou, Rui Li, Chunxiao Du and Zhisong Xiao","doi":"10.1088/1367-2630/ad64fb","DOIUrl":"https://doi.org/10.1088/1367-2630/ad64fb","url":null,"abstract":"Variational quantum algorithms are among the most promising algorithms to achieve quantum advantages in the noisy intermediate-scale quantum (NISQ) era. One important challenge in implementing such algorithms is to construct an effective parameterized quantum circuit (also called an ansatz). In this work, we propose a single entanglement connection architecture (SECA) for a bipartite hardware efficient ansatz (HEA) by balancing its expressibility, entangling capability, and trainability. Numerical simulations with a one-dimensional Heisenberg model and quadratic unconstrained binary optimization (QUBO) issues were conducted. Our results indicate the superiority of SECA over the common full entanglement connection architecture in terms of computational performance. Furthermore, combining SECA with gate-cutting technology to construct distributed quantum computation (DQC) can efficiently expand the size of NISQ devices under low overhead. We also demonstrated the effectiveness and scalability of the DQC scheme. Our study is a useful indication for understanding the characteristics associated with an effective training circuit.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":"16 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770821","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

Is the dynamical quantum Cheshire cat detectable? 动态量子柴郡猫可以被探测到吗？

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-24 DOI: 10.1088/1367-2630/ad6476

Jonte R Hance, James Ladyman and John Rarity

引用次数: 0

Active Brownian particle under stochastic orientational resetting 随机方向重设下的主动布朗粒子

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-24 DOI: 10.1088/1367-2630/ad602a

Yanis Baouche, Thomas Franosch, Matthias Meiners and Christina Kurzthaler

引用次数: 0