Article
Physics, Multidisciplinary
Dayou Yang, Susana F. Huelga, Martin B. Plenio
Summary: Continuous monitoring of driven-dissipative quantum-optical systems is crucial for achieving highly precise measurements beyond the classical limit. We design a novel continuous-measurement strategy and develop a universal method to efficiently retrieve the quantum Fisher information. We also establish an effective formula for evaluating the quantum Fisher information of the emission field of driven-dissipative open sensors.
Article
Physics, Multidisciplinary
Lupei Qin, Yingxin Liu
Summary: In this work, a comprehensive analysis is carried out for the weak-value-amplification (WVA) measurement in a single trapped Ca-40(+) ion system. The meter's shift, the distribution profile of the output data, and its variance width are investigated, and the quality of the WVA measurement is characterized using the signal-to-noise ratio criterion and the Fisher information. A detailed comparison with conventional measurement is presented. The study also explores the imaginary WVA measurement.
Article
Physics, Multidisciplinary
Yong-Li Wen, Shanchao Zhang, Hui Yan, Shi-Liang Zhu
Summary: This study proposes a modified scheme to directly measure the wave function of photons by inserting a liquid crystal plate, increasing the efficiency of post selection and speeding up the measurement of quantum wave functions.
Article
Materials Science, Multidisciplinary
Sajede Harraz, Jiao-Yang Zhang, Shuang Cong
Summary: This study proposes a teleportation protocol for teleporting an unknown qubit through amplitude damping channels. By utilizing environment-assisted measurement and weak measurement, high fidelity and high success probability can be achieved during the teleportation process. For third-party assisted teleportation, the decoherence of shared entanglement can be completely suppressed by using environment-assisted measurement.
RESULTS IN PHYSICS
(2023)
Article
Quantum Science & Technology
Ye-Chao Liu, Yinfei Li, Jiangwei Shang, Xiangdong Zhang
Summary: Quantum state verification (QSV) is the task of verifying the desired target state of a quantum device using local measurements only. Despite efficient verification protocols for certain types of entangled states, designing the verification protocol for arbitrary entangled states remains an open problem. This study presents a systematic strategy by considering the locality of choice-independent measurement protocols and demonstrates the superiority of the method using standard Pauli projections to attain better QSV strategies. The framework can also be extended to other tasks such as entanglement witnesses and parameter estimation.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Automation & Control Systems
Shuang An, Feiyue Wu, Jie Lian, Dong Wang
Summary: This article investigates the stability problem of discrete-time switched positive linear systems (SPLSs) with marginally stable subsystems. By utilizing the weak common linear copositive Lyapunov function (weak CLCLF) approach, the switching property and the state component property are combined to ensure the asymptotic stability of SPLSs under three types of switching signals. Novel cycle-dependent joint path conditions are proposed for transfer-restricted switching signals, and two types of path conditions are constructed for designing switching schemes under time interval sequence. Additionally, necessary and sufficient conditions for the asymptotic stability of SPLSs under arbitrary switching are established, and three examples are provided to demonstrate the effectiveness of the proposed method.
IEEE TRANSACTIONS ON CYBERNETICS
(2023)
Article
Physics, Multidisciplinary
Ron Aharon Melcer, Sofia Konyzheva, Moty Heiblum, Vladimir Umansky
Summary: Thermal conductance measurements are crucial in condensed-matter physics for understanding topological order in two-dimensional topological insulators. A new local power measurement technique is presented to reveal the topological thermal Hall conductance, going beyond traditional two-terminal conductance measurements. This technique also proves useful in studying power carried by current fluctuations of partitioned edge modes with out-of-equilibrium distributions.
Article
Quantum Science & Technology
Doha A. Rizk, Ahmed Younes
Summary: The paper introduces a new quantum algorithm using weak measurement and partial negation to solve the quantum state discrimination problem. By counting the outcome of successive measurements on an auxiliary qubit, the algorithm can determine with high probability the state of an unknown qubit after measuring a single copy of it.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Sajede Harraz, Shuang Cong, Juan J. Nieto
Summary: This paper introduces a quantum state recovery scheme based on environment assisted measurement using weak measurements and flip operations. The proposed scheme significantly improves the success probability of recovering the system from a decoherence channel for all initial states. The explicit formulas for total fidelity and success probability of recovering N-qubit GHZ state are derived.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Xuanmin Zhu, Yuanchun Deng, Runping Gao, Qun Wei, Lixia Liu, Zijiang Luo
Summary: The quantum state tomography strategy via weak value is valid for arbitrary dimensional systems, but has lower efficiency compared to conventional quantum state tomography, especially for high-dimensional systems. A two-step adaptive quantum state tomography via weak value for pure states is proposed to significantly improve efficiency, especially for high-dimensional systems, and can be easily implemented. These results suggest that this method may be useful in measuring unknown quantum states.
RESULTS IN PHYSICS
(2021)
Article
Quantum Science & Technology
Yan-Ling Li, Fengxiao Sun, Jing Yang, Xing Xiao
Summary: The study reexamined quantum teleportation from a Fisher information perspective, proposing two schemes to enhance the teleportation of quantum Fisher information under amplitude damping channel. It was found that the environment-assisted measurement scheme outperforms the weak measurement scheme in improving the quantum Fisher information transfer.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Multidisciplinary Sciences
Joshua Foo, Estelle Asmodelle, Austin P. Lund, Timothy C. Ralph
Summary: Bohmian mechanics is a nonlocal hidden-variable interpretation of quantum theory that predicts deterministic trajectories for particles in spacetime. This study proposes an approach to construct relativistic Bohmian-type velocity field and applies it to obtain relativistic spacetime trajectories of photons in a Michelson-Sagnac interferometer.
NATURE COMMUNICATIONS
(2022)
Article
Quantum Science & Technology
Sajede Harraz, Shuang Cong, Juan J. Nieto
Summary: This paper proposes a quantum teleportation channel protection scheme to enhance teleportation fidelity in the presence of decoherence. Specific operations are applied before and after the teleportation to protect and recover entanglement.
EPJ QUANTUM TECHNOLOGY
(2022)
Article
Chemistry, Physical
Adam S. Abbott, Boyi Z. Abbott, Justin M. Turney, Henry F. Schaefer
Summary: This paper introduces a general methodology for obtaining arbitrary-order nuclear coordinate derivatives of electronic energies derived from quantum chemistry methods. By leveraging modern advances in automatic differentiation software, exact derivatives can be obtained for any method, bypassing computational stability issues associated with numerical differentiation methods and eliminating the need for deriving challenging formulae for analytic energy derivatives.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Optics
Kevin Araya-Sossa, Miguel Orszag
Summary: This work investigates the measurement transition of a coherent squeezed pointer state using a transition factor Gamma that involves system-pointer coupling, revealing a relationship between the shift in the pointer's position and momentum with a new value defined as the transition value. A strategy is introduced to achieve different measurement regimes by adjusting parameters of the coherent squeezed pointer state, showcasing a potential for testing quantum mechanics foundations. The theoretical application of this scheme in a trapped ion illuminated by a bichromatic laser beam suggests future experimental implementations.
Article
Physics, Multidisciplinary
Wentao Ji, Zihua Chai, Mengqi Wang, Yuhang Guo, Xing Rong, Fazhan Shi, Changliang Ren, Ya Wang, Jiangfeng Du
Summary: In this experiment, the researchers demonstrate the crucial role of quantum correlation between the working medium and the thermal bath in the quantum advantage of a quantum Szilard engine. By quantifying nonclassical correlation through quantum steering, they verify the quantum nature of the heat engine.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Zhecheng Wang, Fei Kong, Pengju Zhao, Zhehua Huang, Pei Yu, Ya Wang, Fazhan Shi, Jiangfeng Du
Summary: Developing robust microwave-field sensors is important in a wide range of applications. The nitrogen vacancy (NV) center in diamond is a suitable candidate due to its sensitivity, stability, and compatibility. However, existing NV center-based magnetometers have limited sensitivity in the microwave band. This study presents a continuous heterodyne detection scheme that enhances the sensor's response to weak microwaves, achieving a sensitivity of 8.9 pT Hz(-1/2) for microwaves of 2.9 GHz. The scheme removes control pulses and benefits practical applications of diamond-based microwave sensors.
Article
Physics, Multidisciplinary
Yue Fu, Wenquan Liu, Xiangyu Ye, Ya Wang, Chengjie Zhang, Chang-Kui Duan, Xing Rong, Jiangfeng Du
Summary: This experimental investigation demonstrates the existence of quantum correlations in a two-qutrit spin system at room temperature using a single nitrogen-vacancy center in diamond. The study reveals the presence of quantum entanglement and nonclassical correlations beyond entanglement in the qutrit case. These findings highlight the potential of NV centers as a multiqutrit system for quantum information tasks and offer a powerful experimental platform for studying high-dimensional quantum systems in the future.
PHYSICAL REVIEW LETTERS
(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
Tianyu Xie, Zhiyuan Zhao, Shaoyi Xu, Xi Kong, Zhiping Yang, Mengqi Wang, Ya Wang, Fazhan Shi, Jiangfeng Du
Summary: We experimentally demonstrate a 99.920(7)% fidelity controlled-NOT gate in a solid-state spin system at room temperature by suppressing complicated noise. Previous works limited the fidelity at 99% by considering only static classical noise, whereas our complete noise model considers time dependence and the quantum nature of the spin bath. All noises are dynamically corrected by an exquisitely designed shaped pulse, resulting in an error below 10-4. Our noise-resistant method is universal and can benefit other solid-state spin systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Zhi Cheng, Xiangyu Ye, Jiandong Wu, Pei Yu, Cheng-Jie Wang, Mengqi Wang, Changkui Duan, Ya Wang, Fazhan Shi, Changlin Tian, Hongwei Chen, Pengfei Wang, Jiangfen Du
Summary: Nanoscale sensing and imaging of electromagnetic field can be achieved by utilizing the forbidden magnetic dipole transition of a single shallow nitrogen-vacancy center in diamond. The detection of rf electric fields at frequencies ranging from 13.85 MHz to 2.02 GHz is successfully demonstrated, with a sensitivity of 265 V cm-1 Hz-1/2 for amplitude measurement and a standard deviation of 0.2 degrees for phase measurement. The potential applications of such nanoscale sensor in science and technology are discussed.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Multidisciplinary
Zhe Ding, Yumeng Sun, Ningchong Zheng, Xingyue Ma, Mengqi Wang, Yipeng Zang, Pei Yu, Zhousheng Chen, Pengfei Wang, Ya Wang, Yurong Yang, Yuefeng Nie, Fazhan Shi, Jiangfeng Du
Summary: A freestanding BiFeO3 film was mechanically stretched on an organic substrate to apply in situ uniaxial tensile strain, and the nanoscale magnetic order was imaging using scanning nitrogen-vacancy microscopy. The spin cycloid was found to tilt by about 12.6 degrees under 1.5% strain, which was energetically favorable according to first principle calculations. This combination of in situ strain application and scanning NV microscope imaging provides a new way to study the coupling between magnetic order and strain in BiFeO3 films.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Nanyang Xu, Feifei Zhou, Xiangyu Ye, Xue Lin, Bao Chen, Ting Zhang, Feng Yue, Bing Chen, Ya Wang, Jiangfeng Du
Summary: In diamond-based nanoscale sensing applications, noise-induced control imperfection is a significant problem. This study introduces a deep learning approach to predict the trend of noise and compensate for the delay, aiming to improve the sensing performance. Experimental results show that this approach effectively enhances the decoherence time of the electron spin and can be extended to other quantum systems.
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
Multidisciplinary Sciences
Zhiyuan Zhao, Xiangyu Ye, Shaoyi Xu, Pei Yu, Zhiping Yang, Xi Kong, Ya Wang, Tianyu Xie, Fazhan Shi, Jiangfeng Du
Summary: This study achieves nanoscale sensitivity for detecting microscopic magnetic fields using nitrogen-vacancy defects in diamond, with enhanced sensitivity through the integration of multiple quantum techniques. The findings have implications in various fields, including exploring new physics, studying magnetic phenomena in condensed matters, and monitoring sub-cellular life activities.
NATIONAL SCIENCE REVIEW
(2023)
Article
Engineering, Electrical & Electronic
Yijin Xie, Caijin Xie, Yunbin Zhu, Ke Jing, Yu Tong, Qin Xi, Haosen Guan, Chang-Kui Duan, Ya Wang, Xing Rong
Summary: High-sensitivity magnetometry is crucial for biomagnetism and geomagnetism. However, the sensitivity improvement for dc and low-frequency signal detection is challenging due to the presence of low-frequency noise from various sources. In this study, we utilized a flux concentration and modulation technique to convert dc magnetic signals to ac, allowing for the application of dynamical decoupling to prolong the dephasing time. As a result, we achieved a sensitivity of 32 pT/Hz(1/2) in a dc magnetometer, which is two orders of magnitude higher than that of the Ramsey-type dc magnetometer. Although further enhancement of sensitivity is challenging, there is still considerable room for improvement. Our findings provide insight into the future realization of room temperature dc quantum magnetometry with femtotesla sensitivity.
IEEE SENSORS JOURNAL
(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
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
Changliang Ren, Xiaowei Liu, Wenlin Hou, Tianfeng Feng, Xiaoqi Zhou
Summary: This study discusses the nonlocality sharing in a three-qubit system through multilateral sequential measurements. It is observed that all eight MABK inequalities can be violated simultaneously, leading to the nonlocality sharing based on the multiple violations of MABK inequality in the trilateral sequential measurements scenario. However, genuine nonlocality sharing based on the multiple violation of Svetlichny inequality can only be observed in the unilateral sequential measurements scenario. Compared to two-qubit cases, the nonlocality sharing in a three-qubit system exhibits more fruitful characteristics.
Article
Optics
Wenlin Hou, Xiaowei Liu, Changliang Ren
Summary: We investigated network nonlocality sharing in the extended bilocal scenario via weak measurements, and found that this sharing can be revealed through violation of inequalities, which has no counterpart in standard Bell scenarios. Furthermore, we discussed the noise resistance of this sharing.
