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Slow and stored light via electromagnetically induced transparency using a Λ-type superconducting artificial atom

Physical Review Research 2025年第1期7卷 L012015-L012015页

作者： Kai-I Chu Xiao-Cheng Lu Kuan-Hsun Chiang Yen-Hsiang Lin Chii-Dong Chen Ite A. Yu Wen-Te Liao Yung-Fu Chen Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taiwan Department of Physics National Central University Taoyuan City 32001 Taiwan Department of Physics National Tsing Hua University Hsinchu 30013 Taiwan Institute of Physics Academia Sinica Taipei 11529 Taiwan Center for Quantum Science and Technology National Tsing Hua University Hsinchu 30013 Taiwan Quantum Technology Center National Central University Taoyuan City 32001 Taiwan Physics Division National Center for Theoretical Sciences Taipei 10617 Taiwan

Recent progresses in Josephson-junction-based superconducting circuits have propelled quantum information processing forward. However, the lack of a metastable state in most superconducting artificial atoms hinders the development of photonic quantum memory in this platform. Here we use a single superconducting qubit-resonator system to realize a desired Λ-type artificial atom, and to demonstrate slow light with a group velocity of 3.6 km/s and the microwave storage with a memory time extending to several hundred nanoseconds via electromagnetically induced transparency. Our results highlight the potential of achieving microwave quantum memory, promising substantial advancements in quantum information processing within superconducting circuits.

关键词： Josephson junction devices

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The Effect of Na2O/Ho2O3 Substitution on absorption spectra of Ho-Tm codoped Boro-Tellurite Glass 12

The Effect of Na2O/Ho2O3 Substitution on absorption spectra ...

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12th International Conference on physics and Its Applications, ICOPIA 2024

作者： Marzuki, A. Djeksadipura, W.M.S. Ramelan, A.H. Fausta, D.E. Harjana Sutomo, A.D. Physics Department Faculty of Mathematics and Natural Science Universitas Sebelas Maret Surakarta. Jl. Ir. Sutami No. 36 Surakarta57126 Indonesia Graduate Physics Program Faculty of Mathematics and Natural Science Universitas Sebelas Maret Surakarta. Jl. Ir. Sutami No. 36 Surakarta57126 Indonesia

Boro-tellurite glasses composed of 57B2O3– (4-y)Na2O-–15Bi2O3-20TeO2–3TiO2–1Tm2O3-yHo2O3 (y = 0, 0.5, 1.0, 1.5, 2.0, and 2.5 mol%) were succesfully synthesised and the change in their absorption spectra in wavelength range 300-1100 nm were studied. All glasses were fabricated at the same melting temperature 1000oC and subsequenlty qunched and annnealled in the same manner. It can be seen that glass dopped with only Tm3+ ions (y = 0) shows three absorption peaks, i.e., 471, 686, and 792 nm. As Ho3+ ions were added, there were additional six new peaks appear, i.e., peaks located around 417, 450, 485, 538, and 642 nm. The study reveals that different peaks show difference of sensitivity to the additional Ho3+ ions concentration with peaks around 450 nm shows the most sensitive. © 2025 Institute of physics Publishing. All rights reserved.

关键词： Glass

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Node-Level Lymph Node Automatic Segmentation in CT Images Using Deep Parallel Structure-Related 3D U-Net Variant 21st

Node-Level Lymph Node Automatic Segmentation in CT Images Us...

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21st Pacific Rim International Conference on Artificial Intelligence, PRICAI 2024

作者： Cheng, Shi Li, Quan Zhang, Guangyu Zhang, Lei Peng, Tao School of Future Science and Engineering Soochow University Suzhou China Center of Stomatology The Second Affiliated Hospital of Soochow University Suzhou China Division of Cardiology Department of Internal Medicine Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan China Graduate Program of Medical Physics and Data Science Research Center Duke Kunshan University Jiangsu Kunshan China

ISBN: (纸本)9789819601240

The delineation of Lymph Nodes (LNs) is pivotal in pinpointing therapeutic targets for radiotherapy in head and neck malignancies. Nevertheless, this endeavor poses a formidable challenge, primarily stemming from the suboptimal contrast against adjacent tissues. This investigation introduces a deep learning methodology aimed at automating the segmentation of LNs within CT scans, offering the following contributions: (1) Expanding upon the 3D Unet model, we incorporate a parallel block consisting of attention gate and squeeze & excitation modules. We extensively evaluate various versions of this parallel block and achieve favorable performance. (2) To address the slow decrease in Dice loss, we introduce a lightweight boundary refinement module. Our proposed method is assessed on a dataset comprising 103 patients and 603 Lymph Nodes (LNs), with 452 nodes used for training and 151 nodes for testing. The node-level Dice similarity coefficient achieved by our method reaches an impressive 0.833. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Computerized tomography

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Anomalous enhancement of Néel order in the S=12 square lattice Heisenberg model under fictitious magnetic field

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Physical Review B 2025年第6期111卷 064415-064415页

作者： Takayuki Yokoyama Yasuhiro Tada Quantum Matter Program Graduate School of Advanced Science and Engineering Hiroshima University Higashihiroshima Hiroshima 739-8530 Japan Institute for Solid State Physics University of Tokyo Kashiwa 277-8581 Japan

Fictitious magnetic fields can be introduced in quantum magnets by strain engineering and the Aharonov-Casher effect. Here, we study impacts of a uniform fictitious magnetic field and corresponding Landau quantization on the Néel order in the S=12 Heisenberg model on the square lattice as a prototypical system of quantum magnets. We first analyze the system by using the spin-wave approximation. It is found that the staggered magnetization is enhanced by the fictitious magnetic field and it shows a simple scaling behavior with respect to the magnetic length, in contrast with a naive expectation based on the Dzyaloshinskii-Moriya interaction. We also perform density-matrix-renormalization-group calculations to fully consider quantum effects and obtain quantitatively more accurate results. The enhancement is found to be anomalously strong, and it shows a nontrivial scaling behavior or a fluctuation induced discontinuity. These results are beyond the well-known understanding of correlated systems under magnetic fields called the magnetic catalysis.

关键词： Spin waves

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Spin nematic order and superconductivity in J1−J2 Kondo lattice model on the square lattice

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Physical Review B 2025年第7期111卷 075110-075110页

作者： Sho Uraga Yasuhiro Tada Quantum Matter Program Graduate School of Advanced Science and Engineering Hiroshima University Higashihiroshima Hiroshima 739-8530 Japan Institute for Solid State Physics University of Tokyo Kashiwa 277-8581 Japan

We investigate competition and cooperation of magnetic frustration and the Kondo effect in the J1−J2 Kondo lattice model on the square lattice at zero temperature. In this model, the frustrated interactions J1,J2 between the localized spins stabilize spin nematic orders, while the Kondo coupling favors local spin singlets. Using the slave boson mean field approximation, we find that the spin nematic order remains stable against small Kondo coupling, and the localized spins and the conduction electrons are effectively decoupled. On the other hand, a standard Fermi liquid state is formed for sufficiently strong Kondo interactions. Furthermore, in an intermediate region with moderate Kondo coupling, the spin nematic order and the Kondo effect coexist, and superconducting pairing of the conduction electrons is induced by the spinon pairing. We discuss the ground state phase diagram and nature of the quantum phase transitions between the different superconducting states.

关键词： Fermi liquids

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Topological orders with classical Lie group symmetries from coupling electron wires

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Physical Review B 2025年第16期111卷 165140-165140页

作者： Pak Kau Lim Michael Mulligan Jeffrey C. Y. Teo Department of Physics and Astronomy University of California Riverside California 92521 USA Department of Physics University of Virginia Charlottesville Virginia 22904 USA Theoretical Sciences Visiting Program Okinawa Institute of Science and Technology Graduate University Onna 904-0495 Japan

We study the topological order that arises from chiral states with SU(N) or SO(N) edge-state symmetry. This extends our previous study of topological orders that descend from the bosonic E8 quantum Hall state. We use exactly solvable models of coupled electron wires to construct states with SU(m)n, SO(m)n, or Sp(m)n topological order for various levels n. We use our constructions to write down string operators for various non-Abelian anyons. We thereby provide a systematic, model derivation of quantum Hall states, topological superconductors, and spin liquids with emergent non-Abelian quasiparticle excitations, including those of Ising, metaplectic, and Fibonacci type.

关键词： Lie groups

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Pb164: A possible heaviest N=Z doubly magic nucleus

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Physical Review Research 2025年第1期7卷 013050-013050页

作者： Tomoya Naito (内藤智也) Masaaki Kimura (木村真明) Masaki Sasano (笹野匡紀) RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) Wako 351-0198 Japan Department of Physics Graduate School of Science The University of Tokyo Tokyo 113-0033 Japan RIKEN Nishina Center for Accelerator-Based Science Wako 351-0198 Japan

We confirm by using the Skyrme Hartree-Fock-Bogoliubov calculation that Pb164 is a possible heaviest N=Z doubly magic nucleus whose lifetime is long enough to be measured on accelerator experiments. We estimate the proton-emission and alpha-decay half-lives of Pb164. The estimated proton-emission half-life ranges from 0.1ps to 10ns, while the alpha decay can be safely neglected.

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Sodium niobate with high photocatalytic activity for the removal of organic dye and inactivation of Escherichia coli, Staphylococcus aureus, and Klebsiella pneumoniae bacteria: the effect of Zn doping on these properties

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Ceramics International 2025年

作者： Fernandes, Daiane Raubach, Cristiane Trassante, Carla Dias, Vagner Melo, Luize Silveira, Marcelle Carvalho, Ramon Moreira, Mario Jardim, Pedro Ferrer, Mateus Giongo, Janice Vaucher, Rodrigo Longo, Elson Cava, Sergio Post-Graduate Program in Materials Science and Engineering Federal University of Pelotas RS Pelotas96010-610 Brazil Post-Graduate Program in Microbiology and Parasitology Federal University of Pelotas RS Capão do Leão96160-000 Brazil Post-Graduate Program in Physics Federal University of Pelotas RS Capão do Leão96160-000 Brazil Functional Materials Development Center São Carlos Federal University SP São Carlos13565-905 Brazil

NaNbO3 doped with Zn (0.00, 0.02, and 0.05 mmol) was synthesized by the microwave-assisted hydrothermal method. Photocatalytic and antibacterial activities were investigated. X-ray diffraction revealed the coexistence of two orthorhombic symmetries (P21ma and Pbma), with doping promoting a progressive increase in the Pbma fraction. All samples exhibited a fiber-like shape (diameter of ∼200 nm), which remained unchanged with doping. The low Zn content (0.02 mmol) reduced the band gap energy from 3.08 to 2.95 eV. As a result, this sample exhibited superior photocatalytic activity, achieving 100 % RhB dye degradation within 45 min, under UV light. Scavenger tests revealed that hydroxyl radicals, holes, and superoxide radical anions were the main active species involved in the photocatalytic reaction. Additionally, the photocatalyst demonstrated excellent recyclability over three consecutive cycles. Pure NaNbO3 exhibited strong antibacterial activity, completely inhibiting the growth of S. aureus, E. coli, and K. pneumoniae at the tested concentrations. Although the Zn-doped sample also demonstrated antibacterial action, the response was concentration-dependent. This study is the first report on Zn doping in NaNbO3, as well as the first investigation of its antibacterial activity against K. pneumoniae and S. aureus. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Escherichia coli

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Spin nematic order and superconductivity in J1-J2 Kondo lattice model on square lattice

arXiv

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arXiv 2025年

作者： Uraga, Sho Tada, Yasuhiro Quantum Matter Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Higashihiroshima739-8530 Japan Institute for Solid State Physics University of Tokyo Kashiwa277-8581 Japan

We investigate competition and cooperation of magnetic frustration and the Kondo effect in the J1-J2 Kondo lattice model on the square lattice at zero temperature. In this model, the frustrated interactions J1,J2 between the localized spins stabilize spin nematic orders, while the Kondo coupling favors local spin singlets. Using the slave boson mean field approximation, we find that the spin nematic order remains stable against small Kondo coupling, and the localized spins and the conduction electrons are effectively decoupled. On the other hand, a standard Fermi liquid state is formed for sufficiently strong Kondo interactions. Furthermore, in an intermediate region with moderate Kondo coupling, the spin nematic order and the Kondo effect coexist, and superconducting pairing of the conduction electrons is induced by the spinon pairing. We discuss the ground state phase diagram and nature of the quantum phase transitions between the different superconducting states. Copyright © 2025, The Authors. All rights reserved.

关键词： Fermi liquids

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Stability of quasi-particle creation and multiband geometry in fractional Chern insulators under magnetic fields

arXiv

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arXiv 2025年

作者： Higashino, Nozomi Tada, Yasuhiro Quantum Matter Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Higashihiroshima739-8530 Japan Institute for Solid State Physics University of Tokyo Kashiwa277-8581 Japan

We study creation of quasi-particles in fractional Chern insulators (FCI) under magnetic fields. We consider two representative models, the Kapit-Mueller model and the checkerboard model, which have distinct band properties in terms of the quantum geometry. The former satisfies the so-called ideal condition and well mimics the lowest Landau level, while the latter is not ideal for realization of FCI states. It is found within exact diagonalization that both quasi-holes and quasi-electrons are stably created by the magnetic fields in the Kapit-Mueller model. On the other hand, stability of the quasi-particle creation depends on directions of the magnetic field in the checkerboard model. Although the quasi-electron creation is stable under a magnetic field, the quasi-hole creation and the underlying FCI state are unstable for the opposite field direction, leading to a field-induced non-FCI state. We point out that this difference can be understood based on the multiband quantum geometry in the presence of the magnetic fields. Copyright © 2025, The Authors. All rights reserved.

关键词： Magnetic fields

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