1 南京大学固体微结构物理国家重点实验室, 南京大学物理学院, 人工微结构科学与技术协同创新中心, 江苏 南京 210093
2 渥太华大学物理系, 加拿大 渥太华, K1N 6N5
作为光子重要自由度之一,轨道角动量(OAM)在光量子信息研究中占据着重要地位。将其与偏振等光子的其他自由度相结合,可实现多自由度光量子信息处理。此外,由于其具有天然的离散高维属性,故其是开展高维量子信息处理研究的最佳自由度之一。基于自发参量下转换非线性光学过程能够便捷地获得OAM纠缠源。近年来,光子OAM量子纠缠的研究受到了广泛关注,在多自由度、高维和多光子等多个方向都取得了重要进展。然而,该领域尚有诸多悬而未决的关键科学问题亟须深入研究,包括如何实现高效高质的OAM分离,如何实现更高维度的频率转换,如何提升多自由度纠缠源的品质,如何获得更多维度、更多光子的高维纠缠态以及如何构建可行的高维量子门等。从光子OAM最基本的二维操纵着手,综述了单光子OAM量子态调控、双光子及多光子OAM纠缠操纵。围绕多自由度、大角动量和高维等特性,从生成、调控、测量及应用等角度系统讨论了光子OAM量子纠缠。同时,探索了解决本方向关键科学问题的一些可能解决途径。
Author Affiliations
Abstract
1 School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
2 National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
In free-space or in optical fibers, orbital angular momentum (OAM) multiplexing for information transmission has been greatly developed. The light sources used were well coherent communication bands, and the fibers used were customized. Here, we use an 810 nm femtosecond laser to generate optical vortices carrying OAM and then feed them into two kinds of commercial step-index few-mode fibers to explore the transmission characteristics of OAM modes. We also propose a method without multiple-input multiple-output digital signal processing to identify the input OAMs. It is of great guiding significance for high-dimensional quantum information experiments via the OAMs as a degree of freedom, using the light generated by the spontaneous parametric down-conversion as the source and the commercial fibers for information transmission.
060.2310 Fiber optics 050.4865 Optical vortices 080.4865 Optical vortices Chinese Optics Letters
2019, 17(12): 120601
1 南开大学物理科学学院,弱光非线性光子学教育部重点实验室, 天津 300071
2 南京大学固体微结构物理国家重点实验室,人工微结构科学与技术协同创新中心, 江苏 南京 210093
3 曲阜师范大学物理工程学院,山东省激光偏光与信息技术重点实验室, 山东 曲阜 273165
作为光的一个基本属性,偏振态提供的自由度对光场调控具有重要作用。具有空间结构偏振态分布的矢量光场因其具有不同于传统标量光场的独特性质而被应用于诸多领域,但矢量光场的早期研究主要集中于柱对称的局域线偏振矢量光场。近年来,偏振态分布更加丰富的新型矢量光场逐渐得到关注,这些新型矢量光场的出现丰富了矢量光场的种类并提供了新的调控自由度,被应用于焦场调控、光学微加工、光学微操纵和光信息传输等领域。综述了近年来出现的新型矢量光场,包括柱坐标系中的杂化偏振矢量光场、庞加莱球相关的矢量光场、阵列矢量光场、多奇点矢量光场和其他非柱对称的矢量光场,介绍了其进展、设计方案、实验生成、性质和相关应用。
物理光学 偏振态 矢量光场 光场调控 庞加莱球 奇点
Author Affiliations
Abstract
1 MOE Key Laboratory of Weak Light Nonlinear Photonics and School of Physics, Nankai University, Tianjin 300071, China
2 National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China
3 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
Transporting information is one of the important functions of photons and is also the essential duty of information science. Here, we realize multiple imaging by detecting photons with changeable wavelengths based on time-resolved correlation measurements. In our system, information from multiple objects can be transported. During this process, the wavelength of the photons illuminating the objects is different from the wavelength of the photons detected by the detectors. More importantly, the wavelength of the photons that are utilized to record images can also be changed to match the sensitive range of the used detectors. In our experiment, images of the objects are reconstructed clearly by detecting the photons at wavelengths of 650, 810, and 1064 nm, respectively. These properties should have potential applications in information science.
110.4190 Multiple imaging 110.6915 Time imaging Chinese Optics Letters
2017, 15(8): 081101
Author Affiliations
Abstract
1 Nanjing National Laboratory of Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
2 School of Physics, Nankai University, Tianjin 300071, China
An ultrabroadband supercontinuum (SC) is demonstrated in a pure silica photonic crystal fiber (PCF) pumped by quasi-continuous wave nanosecond-long pulses at 1,064 nm. The generated SC spectra extending from 450 to at least 2,400 nm have the salient feature of a short wavelength regime below the pump wavelength, which is much higher in intensity than the long-wavelength over the pump wavelength. The influence of pump power and repetition rates on SC generation (SCG) is explored. Results suggest that this pump source has both the advantages of short-pulse and continuous-wave pumps for SCG.
光子晶体光纤 超连续 纳秒长脉冲 140.0140 Lasers and laser optics 190.0190 Nonlinear optics Chinese Optics Letters
2011, 9(7): 071405
Author Affiliations
Abstract
1 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
2 School of Physics and Key Laboratory of Weak Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
We study transmission properties in configurations composed of two single metal gratings with different thicknesses. Choosing the perfect electric conductor excludes the influence of intrinsic material dispersion on transmission behaviors; and as such, we aim to reveal the contribution of geometric dispersion to electromagnetic transmission. Transmission suppression line, instead of a transmission suppression point, is discovered, denoting the curve of the wavelength versus the interval or the lateral displacement between the two single gratings when the transmission suppression appears. A simplified model is proposed to comprehend the underlying physics of this special phenomenon.
双金属光栅 完美金属 透射抑制 260.2110 Electromagnetic optics 050.2770 Gratings 120.7000 Transmission Chinese Optics Letters
2010, 8(8): 807
Author Affiliations
Abstract
1 Department of Physics, Hampton University, Hampton, VA 23668, USA
2 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
3 Korea Research Institute of Standards and Science, Daejeon, 305-600, South Korea
Slow and superluminal light propagation in temporal nonlocal response Kerr media has been investigated. The group velocity, as low as tens of few centimeters per second, can be easily obtained by tuning the wavelength of a continuous-wave (CW) laser in a typical Kerr material, such as in alexandrite.
190.3270 Kerr effect 270.5530 Pulse propagation and solitons Chinese Optics Letters
2005, 3(0s): 47
Author Affiliations
Abstract
1 Department of Physics, Shandong Normal University, Ji'nan 250014
2 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
We demonstrated a diode-pumped passively Q-switched mode-locked Nd:YVO4 laser by using a relaxed saturable Bragg reflector (SBR). Stable mode-locked pulse train with the repetition rate of ~230 MHz was achieved and the pulse train was modulated by the Q-switched envelope with the repetition rate of ~150 kHz. The maximum output of 4 W was obtained under the pump power of 13.5 W. The optical-to-optical efficiency was 30%. We also discussed the transition of each process having emerged.
140.3530 lasers neodymium 140.3540 lasers Q-switched 140.4050 mode-locked lasers 140.3480 lasers diode-pumped 140.3070 infrared and far-infrared lasers Chinese Optics Letters
2004, 2(5): 05275
