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Optimization of Light Field for Generation of Vortex Knot

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Chinese Physics Letters 2022年第10期39卷 17-21页

作者： Song Wang Lei Wang Furong Zhang ling-jun kong Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China

The theory of knots and links focuses on the embedding mode of one or several closed curves in three-dimensional Euclidean *** an electromagnetic field system,all-optical knots or links composed of phase or polarization singularities have been verified theoretically and *** studies have shown that robust topological all-optical coding can be achieved by using optical knots and ***,in the current design of optical knots and links based on phase or polarization singularities,the amplitude of light between adjacent singularities is relatively *** brings great pressure to detection of optical knots and links and limits their ***,we propose a new optimization method in *** with the existing design methods,our design method improves the relative intensity distribution of light between adjacent *** verify the feasibility of our design results in *** study reduces the detection difficulty of optical knots and links,and has a positive significance for promotion of applications of optical knots and links.

关键词： polarization Vortex promotion

Observations of Giant Pulses of the Crab Pulsar

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Chinese Journal of Astronomy and Astrophysics 2008年第3期8卷 277-284页

作者： ling-jun kong Ali Esamdin Cheng-Shi Zhao Zhi-Yong Liu Jian-Ping Yuan Urumqi Observatory NAOC Chinese Academy of Sciences Urumqi 830011 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The Crab Pulsar was observed at 1540MHz with the 25m radio telescope at Urumqi with a filterbank de-dispersion backend. A total of 2436 giant pulses with pulse energies larger than 4300 Jy μs were detected in two observing sets. All of these giant pulses are located in the main pulse （MP） and inter pulse （IP） windows of the average profile of the Crab Pulsar. The ratio of the numbers of giant pulses detected in the IP and MP windows is about 0.05. Our results show that, at 1540MHz, the emission in the IP is contributed by giant and normal pulses, while that in the MP is almost dominated by giant pulses. The distribution of energy of the 2436 giant pulses at 1540 MHz can be described by a power-law with index α = 3.13 ± 0.09. The intrinsic threshold of giant pulse energy in the MP window is about 1400Jy μs at 1540MHz.

关键词： stars neutron -- pulsars general -- pulsars individual Crab Pulsar

Unveiling stability of multiple filamentation caused by axial symmetry breaking of polarization

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Photonics Research 2016年第5期4卷 29-34页

作者： Si-Min Li Zhi-Cheng Ren ling-jun kong Sheng-Xia Qian Chenghou Tu Yongnan Li Hui-Tian Wang MOE Key Laboratory of Weak Light Nonlinear Photonics and School of Physics Nankai University National Laboratory of Solid State Microstructures and School of Physics Nanjing University Collaborative Innovation Center of Advanced Microstructures Nanjing University

Femtosecond laser filamentation is generally initialized from unpredictable symmetry breaking caused by random noise, causing it to be barely controlled. However, it is always anticipated for stable and controllable *** present and demonstrate the idea that hybridly polarized vector fields with axial symmetry broken polarization, associated with a pair of orthogonally linearly polarized vortices carrying the opposite-handed orbital angular momenta, could achieve controllable and robust multiple filamentation. Here, our motivation is to unveil the underlying physics behind such controllable and robust multiple filamentation. The symmetry breaking should first be actively controllable and then be able to effectively inhibit random noise. Robust multiple filamentation is inseparable from the fact that the phases between the multiple filaments are always locked. In contrast, uncontrollable multiple filamentation is always accompanied with loss of phase, i.e., the multiple filaments become incoherent to each other. Our results may offer a suggestion for achieving controllable and robust multiple filamentation in other systems.

关键词： AV HP

Spatial-Variant Geometric Phase of Hybrid-Polarized Vector Optical Fields

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Chinese Physics Letters 2017年第4期34卷 50-54页

作者： Yu Si ling-jun kong Yu Zhang Zhi-Cheng Ren Yue Pan Chenghou Tu Yongnan Li Hui-Tian Wang School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics Nankai University Tianjin 300071 National Laboratory of Solid State Microstructures and School of Physics Nanjing University Nanjing 210093 Collaborative Innovation Center of Advanced Microstructures Nanjing 210093

We investigate a novel spatial geometric phase of hybrid-polarized vector fields consisting of linear, elliptical and circular polarizations by Young＇s two-slit interferometer instead of the widely used Mach-Zehnder interferometer. This spatial geometric phase can be manipulated by engineering the spatial configuration of hybrid polarizations, and is directly related to the topological charge, the local states of polarization and the rotational symmetry of hybrid-polarized vector optical fields. The unique feature of geometric phase has implications in quantum information science as well as other physical systems such as electron vortex beams.

关键词： Spatial-Variant Geometric Phase of Hybrid-Polarized Vector Optical Fields VOF HP

Multi-Path Ghost Imaging by Means of an Additional Time Correlation

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Chinese Physics Letters 2019年第4期36卷 39-42页

作者： Rui Liu ling-jun kong Yu Si Zhou-Xiang Wang Wen-Rong Qi Chenghou Tu Yongnan Li Hui-Tian Wang Key Laboratory of Weak-Light Nonlinear Photonics and School of Physics Nankai University National Laboratory of Solid State Microstructures Nanjing University Collaborative Innovation Center of Advanced Microstructures Nanjing University

Ghost imaging functions achieved by means of the spatial correlations between two photons is a new modality in imaging systems. With a small number of photons, ghost imaging is usually realized based on the position correlation of photon pairs produced from the spontaneous parametric down-conversion process. Here we demonstrate a way to realize multi-path ghost imaging by introducing an additional time correlation. Different delays of paths will induce the shift of the coincidence peak, which carries the information about objects. By choosing the suitable coincidence window, we obtain images of three objects simultaneously, with a visibility of 87.2%.This method provides insights and techniques into multi-parameter ghost imaging. It can be applied to other correlated imaging systems, for example, quantum spiral imaging.

关键词： Time images techniques

Asymptotical Locking Tomography of High-Dimensional Entanglement

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Chinese Physics Letters 2020年第3期37卷 26-31页

作者： ling-jun kong Rui Liu Wen-Rong Qi Zhou-Xiang Wang Shuang-Yin Huang Chenghou Tu Yongnan Li Hui-Tian Wang National Laboratory of Solid State Microstruct ures Nanjing UniversityNanjing 210093 Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093 Key Laboratory of Weak-Light Nonlinear Photonics and School of Physics Nankai UniversityTianjin 300071

High-dimensional(HD)entanglement provides a very promising way of transcending the limitations of the twodimensional entanglement between qubits for increasing channel capacity in many quantum *** the pursuit of capitalizing on the HD entangled states,one of the central issues is to unambiguously and comprehensively quantilfy and reconstruct *** full quantum state tomography is a unique solution,but it is undesirable and even impractical because the measurements increase rapidly in d^4 for a bipartite d-dimensional quantum *** we present a very efficient and practical tomography method—asymptotical locking tomography(ALT),which can harvest full information of bipartite d-dimensional entangled states by very few measurements less than 2 d^2 *** showcase the validity and reasonableness of our ALT,we carry out the test with the two-photon spin-orbital angular momentum hyperentangled states in a four-dimensional *** high-efficiency and practicality,our ALT is also universal and can be generalized into multipartite HD entanglement and other quantum systems.

关键词： quantum bipartite Asymptotic

Stronger Hardy-like proof of quantum contextuality

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Photonics Research 2022年第7期10卷 1582-1593页

作者： WEN-RONG QI JIE ZHOU ling-jun kong ZHEN-PENG XU HUI-XIAN MENG RUI LIU ZHOU-XIANG WANG CHENGHOU TU YONGNAN LI ADAN CABELLO JING-ling CHEN HUI-TIAN WANG Key Laboratory of Weak-Light Nonlinear Photonics and School of Physics Nankai UniversityTianjin 300071China School of Physics Henan Normal UniversityXinxiang 453007China Theoretical Physics Division Chern Institute of MathematicsNankai UniversityTianjin 300071China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Naturwissenschaftlich-Technische Fakultät Universität Siegen57068 SiegenGermany Departamento de Física Aplicada II Universidad de SevillaE-41012 SevillaSpain

A Hardy-like proof of quantum contextuality is a compelling way to see the conflict between quantum theory and noncontextual hidden variables(NCHVs),as the latter predict that a particular probability must be zero,while quantum theory predicts a nonzero *** the existing Hardy-like proofs,the success probability tends to 1/2when the number of measurement settings n goes to *** means the conflict between the existing Hardy-like proof and NCHV theory is weak,which is not conducive to experimental *** we advance the study of a stronger Hardy-like proof of quantum contextuality,whose success probability is always higher than the previous ones generated from a certain n-cycle ***,the success probability tends to 1 when n goes to *** perform the experimental test of the Hardy-like proof in the simplest case of n=7 by using a four-dimensional quantum system encoded in the polarization and orbital angular momentum of single *** experimental result agrees with the theoretical prediction within experimental *** addition,by starting from our Hardy-like proof,one can establish the stronger noncontextuality inequality,for which the quantumclassical ratio is higher with the same n,which provides a new method to construct some optimal noncontextuality *** results offer a way for optimizing and enriching exclusivity graphs,helping to explore more abundant quantum properties.

关键词： properties proof quantum

Identifying the Symmetry of an Object Based on Orbital Angular Momentum through a Few-Mode Fiber

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Chinese Physics Letters 2019年第12期36卷 47-51页

作者： Zhou-Xiang Wang Yu-Chen Xie Han Zhou Shuang-Yin Huang Min Wang Rui Lin Wen-Rong Qi Qian-Qian Tian ling-jun kong Chenghou Tu Yongnan Li Hui-Tian Wang School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics Nankai UniversityTianjin 300071 School of Physics and National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093 Collaborative Innovation Center of Advanced Microstructures Nanjing 210093

In recent years,orbital angular momentum(OAM),as a new usable degree of freedom of photons,has been widely applied in both classical optics and quantum *** example,digital spiral imaging uses the OAM spectrum of the output beam from the object to restore the symmetry information of the ***,the related experiments have been carried out in free space so *** to the poor anti-noise performance,limited transmission distance and other reasons,the practicability is seriously ***,we have carried out a digital spiral imaging experiment through a few-mode fiber,to achieve the identification of the symmetry of object by measuring the OAM spectrum of the output *** experiment,we have demonstrated the identification of the symmetry of amplitude-only and phase-only objects with the two-,three-and four-fold rotational *** also give the understanding of the *** believe that our work has greatly improved the practical application of digital spiral imaging in remote sensing.

关键词： optics symmetry Orbital

Double-slit interference of single twisted photons

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Chinese Optics Letters 2020年第10期18卷 69-72页

作者： Wen-Rong Qi Rui Liu ling-jun kong Zhou-Xiang Wang Shuang-Yin Huang Chenghou Tu Yongnan Li Hui-Tian Wang Key Laboratory of Weak-Light Nonlinear Photonics and School of Physics Nankai UniversityTianjin 300071China National Laboratory of Solid State Microstructures School of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

Optical orbital angular momentum(OAM) is a special property of photons and has evoked research onto the light–matter interaction in both classical and quantum regimes. In classical optics, OAM is related to an optical vortex with a helical phase structure. In quantum optics, photons with a twisted or helical phase structure will carry a quantized OAM. To our knowledge, however, so far, no experiment has demonstrated the fundamental property of the OAM at the single-photon level. In this Letter, we have demonstrated the average photon trajectories of twisted photons in a double-slit interference. We have experimentally captured the double-slit interference process of twisted photons by a time-gated intensified charge-coupled device camera, which is trigged by a heralded detection. Our work provides new perspectives for understanding the micro-behaviors of twisted particles and enables new applications in imaging and sensing.

关键词： orbital angular momnenturm double slit interference twisted photons helical phase