Article
Computer Science, Information Systems
Jiying Zhang, Shan Wu, Yongchang Zhang, Zhengwei Zhou
Summary: The proposed scheme uses Uhrig dynamical decoupling to generate two-axis countertwisting squeezed spin states from a one-axis twisting Hamiltonian, significantly reducing the number of control pulses or required evolution time compared to previous proposals. The minimum number of applied pulses changes almost linearly relative to the spin number.
SCIENCE CHINA-INFORMATION SCIENCES
(2021)
Article
Physics, Multidisciplinary
Benjamin Merkel, Pablo Cova Farina, Andreas Reiserer
Summary: Ensembles of dopants have wide applications in quantum technology, but the miniaturization of corresponding devices is hindered by dipolar interactions. Dynamical decoupling can alleviate the decoherence in crystals with strong anisotropic spin-spin interactions, originating from anisotropic g tensor, but cannot fully eliminate it. These findings can be extended to various quantum systems used for quantum sensing, microwave-to-optical conversion, and quantum memory.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Qi Zhang, Yuhang Guo, Wentao Ji, Mengqi Wang, Jun Yin, Fei Kong, Yiheng Lin, Chunming Yin, Fazhan Shi, Ya Wang, Jiangfeng Du
Summary: The nitrogen-vacancy (NV) center in diamond is crucial for achieving high-fidelity single-shot readout of qubits, with a new spin-to-charge conversion method introduced to suppress spin-flip errors. This technique shows potential for exceeding fault-tolerant thresholds and may have applications in integrated optoelectronic devices.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Umberto Celano, Hai Zhong, Florin Ciubotaru, Laurentiu Stoleriu, Alexander Stark, Peter Rickhaus, Felipe Favaro de Oliveira, Mathieu Munsch, Paola Favia, Maxim Korytov, Patricia Van Marcke, Patrick Maletinsky, Christoph Adelmann, Paul van der Heide
Summary: In this study, nonperturbative field distribution mapping in ultra-scaled magnetic nanowires with diameters down to 6 nm was achieved using scanning nitrogen-vacancy magnetometry, enabling localized, minimally invasive magnetic imaging with sensitivity down to 3 μT Hz(-1/2). The imaging revealed the presence of weak magnetic inhomogeneities inside in-plane magnetized nanowires, largely undetectable with standard metrology. The strong magnetic field confinement in the nanowires allowed for the study of the interaction between the stray magnetic field and the nitrogen-vacancy sensor, clarifying the formation mechanisms for technologically relevant magnetic nanostructures.
Article
Chemistry, Multidisciplinary
Michael S. J. Barson, Lachlan M. Oberg, Liam P. McGuinness, Andrej Denisenko, Neil B. Manson, Jorg Wrachtrup, Marcus W. Doherty
Summary: This study demonstrates the potential of using NV centers for nanoscale electric field imaging with high sensitivity, showing near single-charge sensitivity and subelementary charge detection. The results provide motivation for further sensing and imaging of electric fields using NV centers in diamond.
Article
Materials Science, Multidisciplinary
Hyma H. Vallabhapurapu, Chris Adambukulam, Andre Saraiva, Arne Laucht
Summary: This work theoretically demonstrates the high-speed control of the 29Si nuclear spin using indirect control through the electron spin-orbit effect. The impact of nuclear spin precession frequency on gate times and the exciting possibility of all-optical nuclear spin control are discussed.
Article
Physics, Applied
Yue Fu, Yang Wu, Yingqiu Dai, Xi Qin, Xing Rong, Jiangfeng Du
Summary: A new noise-spectrum analysis method without spurious harmonics has been developed and successfully applied to a molecular qubit with a complex spin bath composition. The method can resolve various nuclear spins in the spin bath, such as 1H, 31P, 13C, and 63Cu, which traditional noise-spectrum analysis cannot achieve. This approach may lead to improved quantum-control methods, enhanced material engineering, and increased coherence for molecular qubits.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Multidisciplinary
Xue-Jian Sun, Wen-Xiao Liu, Hao Chen, Cheng-Yuan Wang, Hui-Zhong Ma, Hong-Rong Li
Summary: In this work, a high-fidelity phonon-mediated entangling gate in a hybrid mechanical system based on two silicon-vacancy color centers in diamond is proposed. By using a continuous dynamical decoupling approach and a mechanical driving field, the influence of spin decoherence on the gate is suppressed and the gate fidelity is significantly improved.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2022)
Article
Physics, Applied
Lijuan Dong, Inigo Arrazola, Xi Chen, Jorge Casanova
Summary: In this study, a pulsed dynamical decoupling technique using random or correlated pulse phases is incorporated to enhance the robustness of entangling spin-spin dynamics in trapped ions. Originally conceived for nuclear spin detection in nuclear magnetic resonance, this technique demonstrates applicability for robust quantum-information processing in trapped-ion settings.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Multidisciplinary
C. Munuera-Javaloy, R. Puebla, J. Casanova
Summary: The article discusses the use of NV quantum sensors for micron- and nanometer-sized samples in nuclear magnetic resonance (NMR) studies. MW control fields enable high-resolution magnetometry and have applications in various fields.
Article
Physics, Applied
Xiaodong Yang, Yunrui Ge, Bo Zhang, Jun Li
Summary: This study investigates the combination of dynamical decoupling and robust optimal control for high-fidelity control of quantum systems. By using robust optimal control to find robust control pulses and incorporating them into dynamical decoupling sequences, a remarkable improvement in robustness against multiple error channels is achieved.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
B. D. Wood, S. Bose, G. W. Morley
Summary: Researchers propose a scheme to place a diamond with negatively charged nitrogen-vacancy centers in a macroscopic spatial superposition with a separation of over 250 nm, while utilizing dynamical decoupling.
Article
Optics
Jiaan Qi, Xiansong Xu, Dario Poletti, Hui Khoon Ng
Summary: Dynamical decoupling (DD) is a widely used error mitigation method that aims to eliminate slowly evolving noise in quantum systems using pulse sequences. However, in the presence of noisy pulses, DD does not always effectively mitigate errors. It only works when the noise introduced by imperfect DD pulses is not greater than the original background noise.
Article
Physics, Multidisciplinary
M. Perdriat, P. Huillery, C. Pellet-Mary, G. Hetet
Summary: This study predicts and reports the strong diamagnetism of nanodiamonds with embedded NV centers. The ability to control the magnetic susceptibility and crystalline axis direction shows promising potential for various applications.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Gerald Q. Yan, Senlei Li, Hanyi Lu, Mengqi Huang, Yuxuan Xiao, Luke Wernert, Jeffrey A. Brock, Eric E. Fullerton, Hua Chen, Hailong Wang, Chunhui Rita Du
Summary: This paper reports on the nanoscale imaging of spin-orbit-torque-induced deterministic magnetic switching and chiral spin rotation in non-collinear antiferromagnet Mn3Sn films using nitrogen-vacancy (NV) centers. Direct evidence of the off-resonance dipole-dipole coupling between the spin dynamics in Mn3Sn and proximate NV centers is also demonstrated by NV relaxometry measurements.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Sanyou Chen, Wanhe Li, Xiaohu Zheng, Pei Yu, Pengfei Wang, Ziting Sun, Yao Xu, Defeng Jiao, Xiangyu Ye, Mingcheng Cai, Mengze Shen, Mengqi Wang, Qi Zhang, Fei Kong, Ya Wang, Jie He, Haiming Wei, Fazhan Shi, Jiangfeng Du
Summary: We developed a micrometer-resolution immunomagnetic microscopy (IMM) using nitrogen-vacancy centers in diamond as quantum sensors for imaging human tumor tissues. By immunomagnetically labeling cancer biomarkers and reconstructing magnetic images with deep-learning algorithms, we achieved quantification of biomarker expression. In addition, multimodal imaging of tumor tissues was realized by combining IMM with other imaging methods.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Multidisciplinary
Yu He, Runqi Kang, Zhifu Shi, Xing Rong, Jiangfeng Du
Summary: A new design of resonant cavity for a W-band electron paramagnetic resonance (EPR) spectrometer is reported, which features an improved coupling-adjusting mechanism and adjustable resonant frequency, making it suitable for both continuous-wave and pulsed EPR experiments, and showing great potential in various fields.
Article
Physics, Multidisciplinary
Yulong Liu, Jingwei Zhou, Laure Mercier de Lepinay, Mika A. Sillanpaa
Summary: In this study, a quantum backaction measurement was carried out on a large silicon nitride membrane oscillator with a diameter of 0.5 mm and a frequency of 707 kHz using a microwave cavity readout. The results show that quantum backaction noise can be avoided in the quadrature measurement of the motion of a large object.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Feng Bao, Hao Deng, Dawei Ding, Ran Gao, Xun Gao, Cupjin Huang, Xun Jiang, Hsiang-Sheng Ku, Zhisheng Li, Xizheng Ma, Xiaotong Ni, Jin Qin, Zhijun Song, Hantao Sun, Chengchun Tang, Tenghui Wang, Feng Wu, Tian Xia, Wenlong Yu, Fang Zhang, Gengyan Zhang, Xiaohang Zhang, Jingwei Zhou, Xing Zhu, Yaoyun Shi, Jianxin Chen, Hui-Hai Zhao, Chunqing Deng
Summary: Superconducting qubits provide a promising path toward building large-scale quantum computers. Among alternative superconducting qubits, fluxonium exhibits large anharmonicity and long coherence times, making it a particularly promising candidate. In this work, we engineer a fluxonium-based quantum processor that achieves high qubit coherence, fast frequency tunability, and individual-qubit addressability for reset, readout, and gates. With simple and fast gate schemes, we achieve high average fidelity for single-qubit and two-qubit gates, comparable to the highest reported values in literature.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Cheng-Jie Wang, Pengfei Wang, Yan Zhou, Wenhong Wang, Fazhan Shi, Jiangfeng Du
Summary: This study presents the formation of biskyrmion bubbles mediated by emergent monopoles through micromagnetic simulations. It is found that biskyrmion bubbles and trivial bubbles have a unified three-dimensional structure, and the two-dimensional topological property of biskyrmions is dominated by the relative position of the intrinsic emergent monopole-antimonopole pair. Biskyrmion bubbles can be transformed from trivial bubbles through the motion of emergent monopoles in confined geometry, paving the way for the development of devices.
NPJ QUANTUM MATERIALS
(2022)
Article
Multidisciplinary Sciences
Mengqi Wang, Haoyu Sun, Xiangyu Ye, Pei Yu, Hangyu Liu, Jingwei Zhou, Pengfei Wang, Fazhan Shi, Ya Wang, Jiangfeng Du
Summary: This research introduces a facile self-aligned patterning technique for efficient and consistent fabrication of diamond nanopillar sensor arrays with near-optimal photon counts. The technique demonstrates high yield and efficiency, achieving saturated fluorescence rate and effective fluorescence-dependent detection sensitivity.
Article
Physics, Multidisciplinary
Tian Tian, Yichuan Zhang, Liang Zhang, Longhao Wu, Shaochun Lin, Jingwei Zhou, Chang-Kui Duan, Jian-Hua Jiang, Jiangfeng Du
Summary: In this study, robust unidirectional adiabatic pumping of phonons was achieved in a parametrically coupled nanomechanical system. By utilizing nearly degenerate local modes and their dynamic modulation, nonreciprocal transfer of phononic excitations from one edge to the other was achieved with near unit fidelity. This experiment paves the way for nonreciprocal phonon dynamics via adiabatic pumping and has significant implications for phononic quantum information processing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
Hao Deng, Zhijun Song, Ran Gao, Tian Xia, Feng Bao, Xun Jiang, Hsiang-Sheng Ku, Zhisheng Li, Xizheng Ma, Jin Qin, Hantao Sun, Chengchun Tang, Tenghui Wang, Feng Wu, Wenlong Yu, Gengyan Zhang, Xiaohang Zhang, Jingwei Zhou, Xing Zhu, Yaoyun Shi, Hui -Hai Zhao, Chunqing Deng
Summary: In this study, we report the deposition of a titanium nitride (TiN) film on a sapphire substrate, achieving low dielectric loss at the material interface. Through systematic characterization of transmon qubits with different participation ratios of the material interface, we obtained a loss-tangent value smaller than 8.9 x 10-4 and a limiting quality factor of about 7.3 million. By optimizing the interface participation ratio, we reproducibly achieved an average quality factor of 5.7 million for 2D qubits, with lifetimes of up to 300 μs and quality factors reaching 8.1 million for the best qubits. These results demonstrate that TiN film on sapphire substrate is an ideal material system for high-coherence superconducting qubits.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Multidisciplinary
Sanyou Chen, Ziting Sun, Wanhe Li, Pei Yu, Qian Shi, Fei Kong, Qi Zhang, Pengfei Wang, Ya Wang, Jiangfeng Du, Fazhan Shi
Summary: Using nitrogen-vacancy centers in diamond as quantum sensors, a digital magnetic detection of biomolecular interactions with single magnetic nanoparticles (MNPs) is achieved. A single-particle magnetic imaging method is developed, allowing for accurate quantification and differentiation of biotin-streptavidin interactions and DNA-DNA interactions with a single-base mismatch. A digital immunomagnetic assay is also developed for the examination of SARS-CoV2-related antibodies and nucleic acids. The magnetic separation process improves detection sensitivity and specificity.
Article
Quantum Science & Technology
Mingcheng Cai, Zhongzhi Guo, Chunxing Li, Simin Li, Fazhan Shi, Mengqi Wang, Hui Li, Pengfei Wang, Jiangfeng Du
Summary: This work presents a parallel optically detected magnetic resonance (ODMR) platform for single NV centers. It enables the measurement of magnetic resonance spectrum, Rabi oscillation, and spin echo of each NV center spot in parallel. The preliminary speedup achieved is approximately 20-fold compared to confocal-based ODMR and has the potential to be further extended to thousands of folds with updated equipment.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Quantum Science & Technology
Hang-Yu Liu, Wen-Zhao Liu, Meng-Qi Wang, Xiang-Yu Ye, Pei Yu, Hao-Yu Sun, Zhi-Xian Liu, Zhao-Xin Liu, Jing-Wei Zhou, Peng-Fei Wang, Fa-Zhan Shi, Ya Wang
Summary: A nanoscale vector magnetometer is achieved by integrating a microfabricated diamond probe with a nanopillar on top of a single-mode optical fiber. The concentrated nitrogen vacancies at the center of nanopillars using self-aligned patterning techniques maximize the efficiency. With a sensitivity of 11.27 μT/Hz$\sqrt {{\mathrm{Hz}}} $, the fiber-coupled diamond magnetometer demonstrates a spatial resolution of 100 nm for DC magnetic field sensing. The deterministic oriented diamond nanopillars provided by the probe simplify vector magnetometry.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Multidisciplinary Sciences
Zhen Chen, Qichun Liu, Jingwei Zhou, Peng Zhao, Haifen Yu, Tiefu Li, Yulong Liu
Summary: Nonreciprocal elements, such as isolators and circulators, have been shown to be important in classical and quantum information processing. This work demonstrates broadband nonreciprocal photon transmission in the reversed-dissipation regime, using anti-PT-symmetric dissipative coupling with two kinds of phase factors. The direction of the unidirectional and chiral energy transfer can be controlled by changing the parity of the exceptional points (Eps).
FUNDAMENTAL RESEARCH
(2023)
Article
Instruments & Instrumentation
Zhousheng Chen, Zhe Ding, Mengqi Wang, Pei Yu, Kai Yang, Yumeng Sun, Pengfei Wang, Ya Wang, Fazhan Shi, Xinhe Bao, Jiangfeng Du
Summary: A design of a scanning probe microscope based on a nitrogen-vacancy center is presented, which can operate under various experimental conditions. The reliability of the instrument is demonstrated by showcasing temperature control performance and presenting images of different materials. This study proposes a method and design that extends the potential applications of this microscope in nanomagnetism and spintronics.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Optics
Maimaitiyiming Tusun, Wei Cheng, Zihua Chai, Yang Wu, Ya Wang, Xing Rong, Jiangfeng Du
Summary: Investigating the boundary between quantum mechanical description and classical realistic view is fundamentally important. The Leggett-Garg inequality serves as a criterion to distinguish between quantum and classical systems, and it has been used to prove the existence of macroscopic superposition states. In this study, an experimental violation of the Leggett-Garg inequality in a three-level system using a nitrogen-vacancy center in diamond is presented, providing evidence beyond the Ltiders bound with a high level of confidence.
