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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For selected: Download citations EndNote Ris BibTeX Toggle thumbnails Select Enhanced measurement precision with continuous interrogation during dynamical decoupling Jun Zhang(张军), Peng Du(杜鹏), Lei Jing(敬雷), Peng Xu(徐鹏), Li You(尤力), and Wenxian Zhang(张文献) Chin. Phys. B, 2024, 33 (3): 030301.   DOI: 10.1088/1674-1056/ad1985 Abstract （78）   HTML （2）    PDF （1479KB）（56）       Knowledge map    Dynamical decoupling (DD) is normally ineffective when applied to DC measurement. In its straightforward implementation, DD nulls out DC signal as well while suppressing noise. This work proposes a phase relay method that is capable of continuously interrogating the DC signal over many DD cycles. We illustrate its efficacy when applied to the measurement of a weak DC magnetic field with an atomic spinor Bose-Einstein condensate. Sensitivities approaching standard quantum limit or Heisenberg limit are potentially realizable for a coherent spin state or a squeezed spin state of 10000 atoms, respectively, while ambient laboratory level noise is suppressed by DD. Our work offers a practical approach to mitigate the limitations of DD to DC measurement and would find other applications for resorting coherence in quantum sensing and quantum information processing research. Select One-step quantum dialogue Peng-Hui Zhu(朱鹏辉), Wei Zhong(钟伟), Ming-Ming Du(杜明明), Xi-Yun Li(李喜云), Lan Zhou(周澜), and Yu-Bo Sheng(盛宇波) Chin. Phys. B, 2024, 33 (3): 030302.   DOI: 10.1088/1674-1056/ad1c5c Abstract （79）   HTML （0）    PDF （657KB）（57）       Knowledge map    Quantum dialogue (QD) enables two communication parties to directly exchange secret messages simultaneously. In conventional QD protocols, photons need to transmit in the quantum channel for two rounds. In this paper, we propose a one-step QD protocol based on the hyperentanglement. With the help of the non-local hyperentanglement-assisted Bell state measurement (BSM), the photons only need to transmit in the quantum channel once. We prove that our one-step QD protocol is secure in theory and numerically simulate its secret message capacity under practical experimental condition. Compared with previous QD protocols, the one-step QD protocol can effectively simplify the experiment operations and reduce the message loss caused by the photon transmission loss. Meanwhile, the non-local hyperentanglement-assisted BSM has a success probability of 100% and is feasible with linear optical elements. Moreover, combined with the hyperentanglement heralded amplification and purification, our protocol is possible to realize long-distance one-step QD. Select Measuring small longitudinal phase shifts via weak measurement amplification Kai Xu(徐凯), Xiao-Min Hu(胡晓敏), Meng-Jun Hu(胡孟军), Ning-Ning Wang(王宁宁), Chao Zhang(张超), Yun-Feng Huang(黄运锋), Bi-Heng Liu(柳必恒), Chuan-Feng Li(李传锋), Guang-Can Guo(郭光灿), and Yong-Sheng Zhang(张永生) Chin. Phys. B, 2024, 33 (3): 030602.   DOI: 10.1088/1674-1056/ad1c5a Abstract （179）   HTML （11）    PDF （1036KB）（229）       Knowledge map    Weak measurement amplification, which is considered as a very promising scheme in precision measurement, has been applied to various small physical quantities estimations. Since many physical quantities can be converted into phase signals, it is interesting and important to consider measuring small longitudinal phase shifts by using weak measurement. Here, we propose and experimentally demonstrate a novel weak measurement amplification-based small longitudinal phase estimation, which is suitable for polarization interferometry. We realize one order of magnitude amplification measurement of a small phase signal directly introduced by a liquid crystal variable retarder and show that it is robust to the imperfection of interference. Besides, we analyze the effect of magnification error which is never considered in the previous works, and find the constraint on the magnification. Our results may find important applications in high-precision measurements, e.g., gravitational wave detection. Select Image segmentation of exfoliated two-dimensional materials by generative adversarial network-based data augmentation Xiaoyu Cheng(程晓昱), Chenxue Xie(解晨雪), Yulun Liu(刘宇伦), Ruixue Bai(白瑞雪), Nanhai Xiao(肖南海), Yanbo Ren(任琰博), Xilin Zhang(张喜林), Hui Ma(马惠), and Chongyun Jiang(蒋崇云) Chin. Phys. B, 2024, 33 (3): 030703.   DOI: 10.1088/1674-1056/ad23d8 Abstract （354）   HTML （27）    PDF （1065KB）（315）       Knowledge map    Mechanically cleaved two-dimensional materials are random in size and thickness. Recognizing atomically thin flakes by human experts is inefficient and unsuitable for scalable production. Deep learning algorithms have been adopted as an alternative, nevertheless a major challenge is a lack of sufficient actual training images. Here we report the generation of synthetic two-dimensional materials images using StyleGAN3 to complement the dataset. DeepLabv3Plus network is trained with the synthetic images which reduces overfitting and improves recognition accuracy to over 90%. A semi-supervisory technique for labeling images is introduced to reduce manual efforts. The sharper edges recognized by this method facilitate material stacking with precise edge alignment, which benefits exploring novel properties of layered-material devices that crucially depend on the interlayer twist-angle. This feasible and efficient method allows for the rapid and high-quality manufacturing of atomically thin materials and devices. Select Effect of overheating-induced minor addition on Zr-based metallic glasses Fu Yang(杨福), Zhenxing Bo(薄振兴), Yao Huang(黄瑶), Yutian Wang(王雨田), Boyang Sun(孙博阳), Zhen Lu(鲁振), Baoan Sun(孙保安), Yanhui Liu(柳延辉), Weihua Wang(汪卫华), and Mingxiang Pan(潘明祥) Chin. Phys. B, 2024, 33 (3): 036401.   DOI: 10.1088/1674-1056/ad1823 Abstract （60）   HTML （0）    PDF （5128KB）（40）       Knowledge map    Melt treatment is well known to have an important influence on the properties of metallic glasses (MGs). However, for the MGs quenched from different melt temperatures with a quartz tube, the underlying physical origin responsible for the variation of properties remains poorly understood. In the present work, we systematically studied the influence of melt treatment on the thermal properties of a Zr50Cu36Al14 glass-forming alloy and unveiled the microscopic origins. Specifically, we quenched the melt at different temperatures ranging from 1.1Tl to 1.5Tl (Tl is the liquidus temperature) to obtain melt-spun MG ribbons and investigated the variation of thermal properties of the MGs upon heating. We found that glass transition temperature, Tg, increases by as much as 36 K, and the supercooled liquid region disappears in the curve of differential scanning calorimetry when the melt is quenched at a high temperature up to 1.5Tl. The careful chemical analyses indicate that the change in glass transition behavior originates from the incorporation of oxygen and silicon in the molten alloys. The incorporated oxygen and silicon can both enhance the interactions between atoms, which renders the cooperative rearrangements of atoms difficult, and thus enhances the kinetic stability of the MGs. Select Anomalous spin Josephson effect in spin superconductors Wen Zeng(曾文) and Rui Shen(沈瑞) Chin. Phys. B, 2024, 33 (3): 037401.   DOI: 10.1088/1674-1056/ad1982 Abstract （88）   HTML （3）    PDF （634KB）（83）       Knowledge map    The spin superconductor state is the spin-polarized triplet exciton condensate, which can be viewed as a counterpart of the charge superconductor state. As an analogy of the charge Josephson effect, the spin Josephson effect can be generated in the spin superconductor/normal metal/spin superconductor junctions. Here we study the spin supercurrent in the Josephson junctions consisting of two spin superconductors with noncollinear spin polarizations. For the Josephson junctions with out-of-plane spin polarizations, the possible π-state spin supercurrent appears due to the Fermi momentum-splitting Andreev-like reflections at the normal metal/spin superconductor interfaces. For the Josephson junctions with in-plane spin polarizations, the anomalous spin supercurrent appears and is driven by the misorientation angle of the in-plane polarizations. The symmetry analysis shows that the appearance of the anomalous spin Josephson current is possible when the combined symmetry of the spin rotation and the time reversal is broken. Select Creation and annihilation of artificial magnetic skyrmions with the electric field Jun Cheng(程军), Liang Sun(孙亮), Yike Zhang(张一可), Tongzhou Ji(吉同舟), Rongxing Cao(曹荣幸), Bingfeng Miao(缪冰锋), Yonggang Zhao(赵永刚), and Haifeng Ding(丁海峰) Chin. Phys. B, 2024, 33 (3): 037501.   DOI: 10.1088/1674-1056/ad188f Abstract （173）   HTML （4）    PDF （1824KB）（135）       Knowledge map    Recent theory and experiments show that artificial magnetic skyrmions can be stabilized at room temperature without the need for the external magnetic field, casting strong potentials for the device applications. In this work, we study the electric field manipulation of artificial magnetic skyrmions imprinted by Co disks on CoPt multilayers utilizing the micromagnetic simulations. We find that the reversible annihilation and creation of skyrmions can be realized with the electric field via the strain mediated magnetoelastic coupling. In addition, we also demonstrate controllable manipulation of individual skyrmion, which opens a new platform for constructing magnetic field-free and low-energy dissipation skyrmion based media. Select Coercivity mechanism of La-Nd-Fe-B films with Y spacer layer Jun Ma(马俊), Xiao-Tian Zhao(赵晓天), Wei Liu(刘伟), Yang Li(李阳), Long Liu(刘龙), Xin-Guo Zhao(赵新国), and Zhi-Dong Zhang(张志东) Chin. Phys. B, 2024, 33 (3): 037507.   DOI: 10.1088/1674-1056/ad1d4c Abstract （42）   HTML （1）    PDF （2728KB）（33）       Knowledge map    The effect of the Y spacer layer on the phase composition, coercivity, and magnetization reversal processes of La-Nd-Fe-B films has been investigated. The addition of a 10 nm Y spacer layer increases the coercivity of the film to 1.36 T at 300 K and remains 0.938 T at 380 K. As the thickness of the Y spacer layer increases, Y participates in the formation of the main phase in the film, and further regulates the formation of La-B phases. The results of the first-order reversal curve (FORC) and micromagnetic fitting show that the coercivity of all the films is dominated by nucleation mechanism. The c-axis preferred orientation, good magnetic microstructure parameters and the largest dipole interaction enhance the coercivity. Therefore, the introduction of the Y spacer layer can be an effective way to improve the coercivity of La-Nd-Fe-B film over a wide temperature range of 150 K-380 K. Select Nanoscale cathodoluminescence spectroscopy probing the nitride quantum wells in an electron microscope Zhetong Liu(刘哲彤), Bingyao Liu(刘秉尧), Dongdong Liang(梁冬冬), Xiaomei Li(李晓梅), Xiaomin Li(李晓敏), Li Chen(陈莉), Rui Zhu(朱瑞), Jun Xu(徐军), Tongbo Wei(魏同波), Xuedong Bai(白雪冬), and Peng Gao(高鹏) Chin. Phys. B, 2024, 33 (3): 038502.   DOI: 10.1088/1674-1056/ad1c56 Abstract （85）   HTML （0）    PDF （1300KB）（69）       Knowledge map    To gain further understanding of the luminescence properties of multiquantum wells and the factors affecting them on a microscopic level, cathodoluminescence combined with scanning transmission electron microscopy and spectroscopy was used to measure the luminescence of In0.15Ga0.85N five-period multiquantum wells. The lattice-composition-energy relationship was established with the help of energy-dispersive x-ray spectroscopy, and the bandgaps of In0.15Ga0.85N and GaN in multiple quantum wells were extracted by electron energy loss spectroscopy to understand the features of cathodoluminescence spectra. The luminescence differences between different periods of multiquantum wells and the effects of defects such as composition fluctuation and dislocations on the luminescence of multiple quantum wells were revealed. Our study establishing the direct relationship between the atomic structure of InxGa1-xN multiquantum wells and photoelectric properties provides useful information for nitride applications. Select Remote entangling gate between a quantum dot spin and a transmon qubit mediated by microwave photons Xing-Yu Zhu(朱行宇), Le-Tian Zhu(朱乐天), Tao Tu(涂涛), and Chuan-Feng Li(李传锋) Chin. Phys. B, 2024, 33 (2): 020315.   DOI: 10.1088/1674-1056/ad1747 Abstract （371）   HTML （7）    PDF （729KB）（363）       Knowledge map    Spin qubits and superconducting qubits are promising candidates for realizing solid-state quantum information processors. Designing a hybrid architecture that combines the advantages of different qubits on the same chip is a highly desirable but challenging goal. Here we propose a hybrid architecture that utilizes a high-impedance SQUID array resonator as a quantum bus, thereby coherently coupling different solid-state qubits. We employ a resonant exchange spin qubit hosted in a triple quantum dot and a superconducting transmon qubit. Since this hybrid system is highly tunable, it can operate in a dispersive regime, where the interaction between the different qubits is mediated by virtual photons. By utilizing such interactions, entangling gate operations between different qubits can be realized in a short time of 30 ns with a fidelity of up to 96.5% under realistic parameter conditions. Further utilizing this interaction, remote entangled state between different qubits can be prepared and is robust to perturbations of various parameters. These results pave the way for exploring efficient fault-tolerant quantum computation on hybrid quantum architecture platforms. Select Gigahertz frequency hopping in an optical phase-locked loop for Raman lasers Dekai Mao(毛德凯), Hongmian Shui(税鸿冕), Guoling Yin(殷国玲), Peng Peng(彭鹏), Chunwei Wang(王春唯), and Xiaoji Zhou(周小计) Chin. Phys. B, 2024, 33 (2): 024209.   DOI: 10.1088/1674-1056/ad174b Abstract （109）   HTML （2）    PDF （984KB）（106）       Knowledge map    Raman lasers are essential in atomic physics, and the development of portable devices has posed requirements for time-division multiplexing of Raman lasers. We demonstrate an innovative gigahertz frequency hopping approach of a slave Raman laser within an optical phase-locked loop (OPLL), which finds practical application in an atomic gravimeter, where the OPLL frequently switches between near-resonance lasers and significantly detuned Raman lasers. The method merges the advantages of rapid and extensive frequency hopping with the OPLL's inherent low phase noise, and exhibits a versatile range of applications in compact laser systems, promising advancements in portable instruments. Select Angular and planar transport properties of antiferromagnetic V5S8 Xiao-Kai Wu(吴晓凯), Bin Wang(王彬), De-Tong Wu(吴德桐), Bo-Wen Chen(陈博文), Meng-Juan Mi(弭孟娟), Yi-Lin Wang(王以林), and Bing Shen(沈冰) Chin. Phys. B, 2024, 33 (2): 027503.   DOI: 10.1088/1674-1056/ad15f9 Abstract （223）   HTML （4）    PDF （9933KB）（252）       Knowledge map    Systemically angular and planar transport investigations are performed in layered antiferromagnetic (AF) V5S8. In this AF system, obvious anomalous Hall effect (AHE) is observed with a large Hall angle of 0.1 compared to that in ferromagnetic (FM) system. It can persist to the temperatures above AF transition and exhibit strong angular field dependence. The phase diagram reveals various magnetic states by rotating the applied field. By analyzing the anisotropic transport behavior, magnon contributions are revealed and exhibit obvious angular dependence with a spin-flop vanishing line. The observed prominent planar Hall effect and anisotropic magnetoresisitivity exhibit two-fold systematical angular dependent oscillations. These behaviors are attributed to the scattering from spin-orbital coupling instead of nontrivial topological origin. Our results reveal anisotropic interactions of magnetism and electron in V5S8, suggesting potential opportunities for the AF spintronic sensor and devices. Select Characteristics of cell motility during cell collision Yikai Ma(马一凯), Na Li(李娜), and Wei Chen(陈唯) Chin. Phys. B, 2024, 33 (2): 028702.   DOI: 10.1088/1674-1056/ad117c Abstract （62）   HTML （1）    PDF （1440KB）（57）       Knowledge map    Quantitative examination of cellular motion and intercellullar interactions possesses substantial relevance for both biology and medicine. However, the effects of intercellular interactions during cellular locomotion remain under-explored in experimental research. As such, this study seeks to bridge this research gap, adopting Dictyostelium discoideum (Dicty) cells as a paradigm to investigate variations in cellular motion during reciprocal collisions. We aim to attain a comprehensive understanding of how cell interactions influence cell motion. By observing and processing the motion trajectories of colliding cells under diverse chemical environments, we calculated the diffusion coefficient ($D$) and the persistence time ($\tau$), using mean square displacement. Our analysis of the relationship dynamics between $D$ and $\tau $ prior to the collisions reveals intricate and non-monotonic alterations in cell movements during collisions. By quantitatively scrutinizing the $\tau $ trend, we were able to categorize the cellular responses to interactions under different conditions. Importantly, we ascertained that the effect of cell interactions during collisions in Dicty cells emulates a classical sigmoid function. This discovery suggests that cellular responses might comply with a pattern akin to the Weber-Fechner law. Select Sharing quantum nonlocality in the noisy scenario Shu-Yuan Yang(杨舒媛), Jin-Chuan Hou(侯晋川), and Kan He(贺衎) Chin. Phys. B, 2024, 33 (1): 010302.   DOI: 10.1088/1674-1056/ad062d Abstract （163）   HTML （4）    PDF （1719KB）（232）       Knowledge map    It was showed in [Phys. Rev. Lett. 125 090401 (2020)] that there exist unbounded number of independent Bobs who can share quantum nonlocality with a single Alice by performing sequentially measurements on the Bob's half of the maximally entangled pure two-qubit state. However, from practical perspectives, errors in entanglement generation and noises in quantum measurements will result in the decay of nonlocality in the scenario. In this paper, we analyze the persistency and termination of sharing nonlocality in the noisy scenario. We first obtain the two sufficient conditions under which there exist n independent Bobs who can share nonlocality with a single Alice under noisy measurements and the noisy initial two qubit entangled state. Analyzing the two conditions, we find that the influences on persistency under different kinds of noises can cancel each other out. Furthermore, we describe the change patterns of the maximal nonlocality-sharing number under the influence of different noises. Finally, we extend our investigation to the case of arbitrary finite-dimensional systems. Select Observation of flat-band localized state in a one-dimensional diamond momentum lattice of ultracold atoms Chao Zeng(曾超), Yue-Ran Shi(石悦然), Yi-Yi Mao(毛一屹), Fei-Fei Wu(武菲菲), Yan-Jun Xie(谢岩骏), Tao Yuan(苑涛), Han-Ning Dai(戴汉宁), and Yu-Ao Chen(陈宇翱) Chin. Phys. B, 2024, 33 (1): 010303.   DOI: 10.1088/1674-1056/ad0cd1 Abstract （158）   HTML （2）    PDF （1406KB）（193）       Knowledge map    We investigated the one-dimensional diamond ladder in the momentum lattice platform. By inducing multiple two- and four-photon Bragg scatterings among specific momentum states, we achieved a flat band system based on the diamond model, precisely controlling the coupling strength and phase between individual lattice sites. Utilizing two lattice sites couplings, we generated a compact localized state associated with the flat band, which remained localized throughout the entire time evolution. We successfully realized the continuous shift of flat bands by adjusting the corresponding nearest neighbor hopping strength, enabling us to observe the complete localization process. This opens avenues for further exploration of more complex properties within flat-band systems, including investigating the robustness of flat-band localized states in disordered flat-band systems and exploring many-body localization in interacting flat-band systems. Select Higher-order topological Anderson insulator on the Sierpiński lattice Huan Chen(陈焕), Zheng-Rong Liu(刘峥嵘), Rui Chen(陈锐), and Bin Zhou(周斌) Chin. Phys. B, 2024, 33 (1): 017202.   DOI: 10.1088/1674-1056/ad09d4 Abstract （201）   HTML （4）    PDF （1459KB）（115）       Knowledge map    Disorder effects on topological materials in integer dimensions have been extensively explored in recent years. However, its influence on topological systems in fractional dimensions remains unclear. Here, we investigate the disorder effects on a fractal system constructed on the Sierpiński lattice in fractional dimensions. The system supports the second-order topological insulator phase characterized by a quantized quadrupole moment and the normal insulator phase. We find that the second-order topological insulator phase on the Sierpiński lattice is robust against weak disorder but suppressed by strong disorder. Most interestingly, we find that disorder can transform the normal insulator phase to the second-order topological insulator phase with an emergent quantized quadrupole moment. Finally, the disorder-induced phase is further confirmed by calculating the energy spectrum and the corresponding probability distributions. Select Effects of carrier density and interactions on pairing symmetry in a t2g model Yun-Xiao Li(李云霄), Wen-Han Xi(西文翰), Zhao-Yang Dong(董召阳), Zi-Jian Yao(姚子健), Shun-Li Yu(于顺利), and Jian-Xin Li(李建新) Chin. Phys. B, 2024, 33 (1): 017404.   DOI: 10.1088/1674-1056/ad1094 Abstract （181）   HTML （8）    PDF （4482KB）（213）       Knowledge map    By utilizing the fluctuation exchange approximation method, we perform a study on the superconducting pairing symmetry in a t2g three-orbital model on the square lattice. Although the tight-binding parameters of the model are based on Sr2RuO4, we have systematically studied the evolution of superconducting pairing symmetry with the carrier density and interactions, making our findings relevant to a broader range of material systems. Under a moderate Hund's coupling, we find that spin fluctuations dominate the superconducting pairing, leading to a prevalent spin-singlet pairing with a dx2-y2-wave symmetry for the carrier density within the range of n=1.5—4 per site. By reducing the Hund's coupling, the charge fluctuations are enhanced and play a crucial role in determining the pairing symmetry, leading to a transition of the pairing symmetry from the spin-singlet dx2-y2-wave to the spin-triplet p-wave. Furthermore, we find that the superconducting pairings are orbital dependent. As the carrier density changes from n=4 to n=1.5, the active orbitals for superconducting pairing shift from the quasi-two-dimensional orbital dxy to the quasi-one-dimensional orbitals dxz and dyz. Select Optical study of magnetic topological insulator MnBi4Te7 Zhi-Yu Liao(廖知裕), Bing Shen(沈冰), Xiang-Gang Qiu(邱祥冈), and Bing Xu(许兵) Chin. Phys. B, 2024, 33 (1): 017802.   DOI: 10.1088/1674-1056/ad08aa Abstract （127）   HTML （1）    PDF （1149KB）（69）       Knowledge map    We present an infrared spectroscopy study of the magnetic topological insulator MnBi4Te7 with antiferromagnetic (AFM) order below the Néel temperature TN = 13 K. Our investigation reveals that the low-frequency optical conductivity consists of two Drude peaks, indicating a response of free carriers involving multiple bands. Interestingly, the narrow Drude peak grows strongly as the temperature decreases, while the broad Drude peak remains relatively unchanged. The onset of interband transitions starts around 2000 cm-1, followed by two prominent absorption peaks around 10000 cm-1 and 20000 cm-1. Upon cooling, there is a notable transfer of spectral weight from the interband transitions to the Drude response. Below TN, the AFM transition gives rise to small anomalies of the charge response due to a band reconstruction. These findings provide valuable insights into the interplay between magnetism and the electronic properties in MnBi4Te7. Select Maskless fabrication of quasi-omnidirectional V-groove solar cells using an alkaline solution-based method Xingqian Chen(陈兴谦), Yan Wang(王燕), Wei Chen(陈伟), Yaoping Liu(刘尧平), Guoguang Xing(邢国光), Bowen Feng(冯博文), Haozhen Li(李昊臻), Zongheng Sun(孙纵横), and Xiaolong Du(杜小龙) Chin. Phys. B, 2024, 33 (1): 018801.   DOI: 10.1088/1674-1056/ad0cd0 Abstract （110）   HTML （2）    PDF （1899KB）（32）       Knowledge map    Silicon passivated emitter and rear contact (PERC) solar cells with V-groove texture were fabricated using maskless alkaline solution etching with in-house developed additive. Compared with the traditional pyramid texture, the V-groove texture possesses superior effective minority carrier lifetime, enhanced p—n junction quality and better applied filling factor (FF). In addition, a V-groove texture can greatly reduce the shading area and edge damage of front Ag electrodes when the V-groove direction is parallel to the gridline electrodes. Due to these factors, the V-groove solar cells have a higher efficiency (21.78%) than pyramid solar cells (21.62%). Interestingly, external quantum efficiency (EQE) and reflectance of the V-groove solar cells exhibit a slight decrease when the incident light angle (θ) is increased from 0^o to 75^o, which confirms the excellent quasi omnidirectionality of the V-groove solar cells. The proposed V-groove solar cell design shows a 2.84% relative enhancement of energy output over traditional pyramid solar cells. Select Complete population transfer between next-adjacent energy levels of a transmon qudit Yingshan Zhang(张颖珊), Pei Liu(刘培), Jingning Zhang(张静宁), Ruixia Wang(王睿侠), Weiyang Liu(刘伟洋), Jiaxiu Han(韩佳秀), Yirong Jin(金贻荣), and Haifeng Yu(于海峰) Chin. Phys. B, 2023, 32 (12): 120306.   DOI: 10.1088/1674-1056/ad02e4 Abstract （196）   HTML （0）    PDF （15380KB）（244）       Knowledge map    The utilization of qudits in quantum systems has led to significant advantages in quantum computation and information processing. Therefore, qudits have gained increased attention in recent research for their precise and efficient operations. In this work, we demonstrate the complete population transfer between the next-adjacent energy levels of a transmon qudit using the Pythagorean coupling method and energy level mapping. We achieve a |0> to |2> transfer with a process fidelity of 97.76% in the subspace spanned by |0> to |2>. Moreover, the transfer operation is achieved within a remarkably fast timescale, as short as 20 ns. This study may present a promising avenue for enhancing the operation flexibility and efficiency of qudits in future implementations. page Page 1 of 26 Total 512 records First page Prev page Next page Last page