Article
Optics
Hao Wang, Ziyu Zhan, Yijie Shen, Jianqi Hu, Xing Fu, Qiang Liu
Summary: In the face of a pending capacity crunch in the information era, researchers have demonstrated an alternative method to increase transmission bandwidth by utilizing multiple non-orthogonal states of structured light. This challenges the prevailing view of using orthogonal states as information carriers. Using an adapted deep neural network, six categories of beams were accurately recognized, providing the targeted wide bandwidth. The efficiency was further demonstrated through the transmission/reception of a grayscale image encoded using 256-ary mode encoding and shift keying schemes. The well-trained model also showed high fidelity recognition of structured beams under unknown turbulence and restricted receiver aperture size. This work holds significant potential for intelligence-assisted large-capacity and secure communications to meet the growing demand for daily information bandwidth.
Article
Nanoscience & Nanotechnology
Thomas Dinter, Chenhao Li, Lucca Kuehner, Thomas Weber, Andreas Tittl, Stefan A. Maier, Judith M. Dawes, Haoran Ren
Summary: This study demonstrates the use of an ultrathin OAM mode-sorting metasurface for characterizing the breakdown of OAM orthogonality under different turbulence conditions. The metasurface exhibits strong OAM selectivity and allows the measurement of the whole OAM spectrum at the same time.
News Item
Optics
Spencer W. Jolly
Summary: A diffractive axicon can create intricate connections between topological charges and frequencies of ultrashort laser pulses, resulting in a diverse range of coiled light structures.
News Item
Optics
Philippe St-Jean
Summary: This paper presents a novel solid-state laser that can generate a large array of phase-locked optical vortices with tunable orbital angular momentum.
Article
Physics, Multidisciplinary
Asher Klug, Isaac Nape, Andrew Forbes
Summary: By calculating the orbital angular momentum (OAM) of the atmosphere itself, researchers have drawn general conclusions on the impact of atmospheric turbulence on OAM beams. These conclusions have been experimentally confirmed, opening up new insights into the physics of OAM in turbulence and can be extended to other structured light fields through arbitrary aberrations.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
Jingjing Meng, Jianguo He, Min Huang, Yang LI, Baoyu Zhu, Xinxin Kong, Zhe Han, Xin LI, Yang Liu
Summary: This study proposes a deep learning method that combines CNN and ConvLSTM models to compensate for atmospheric turbulence and correct distorted beams. The experimental results show that this method can effectively and accurately compensate for distorted beams.
Editorial Material
Optics
Gianluca Ruffato
Summary: A recent publication suggests a solution to overcome the limitations of optical techniques and high-intensity beams by probing highly-intense vortex pulses with a structured reference beam.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Analytical
Jian Yang, Yingning Wang, Yuxi Fang, Wenpu Geng, Wenqian Zhao, Changjing Bao, Yongxiong Ren, Zhi Wang, Yange Liu, Zhongqi Pan, Yang Yue
Summary: In this paper, a silica-cladded Germania-doped ring-core fiber (RCF) that supports orbital angular momentum (OAM) modes is designed. By optimizing the fiber structure parameters, the RCF achieves near-zero flat dispersion. This design serves as an efficient way to extend the spectral coverage of beams carrying OAM modes for various applications.
Article
Optics
Asher Klug, Cade Peters, Andrew Forbes
Summary: Structured light is commonly used in free-space optical communication channels to increase bandwidth by encoding information in the spatial structure. Turbulence in the atmosphere can cause distortions in structured light modes, leading to amplitude and phase distortions. We propose complex forms of structured light that are invariant under atmospheric turbulence and provide a theoretical procedure for obtaining these eigenmodes. The proposed approach can also be extended to other channels such as aberrated paths, underwater, and optical fiber.
ADVANCED PHOTONICS
(2023)
Article
Optics
Kaiheng Zou, Xinzhou Su, Murat Yessenov, Kai Pang, Narek Karapetyan, Maxim Karpov, Hao Song, Runzhou Zhang, Huibin Zhou, Tobias J. Kippenberg, Moshe Tur, Ayman F. Abouraddy, Alan E. Willner
Summary: This study investigates the tunability of space-time wave packets by varying the number of frequency comb lines and the combinations of spatial modes. The researchers experimentally generate and measure wave packets with tunable orbital angular momentum (OAM) values and also study the temporal pulse width and non-linear variation of OAM values in simulation.
Article
Multidisciplinary Sciences
Ali Mehdinejad
Summary: This paper investigates the manipulation of induced torque on a four-level tripod atom system through the interaction with two vortex probe beams featuring spatial inhomogeneity, along with a non-vortex control beam. The study explores both the linear and nonlinear regimes of torque induction. The findings offer opportunities for precise control over the rotational motion of atoms within the system, with potential applications in precision measurement, quantum information processing, and quantum control.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Aerospace
Jianwen Guo, Hongyin Shi, Ting Yang, Chunyang Lv, Zhijun Qiao
Summary: This study proposes a convolutional neural network-based compensation method for atmospheric turbulence, which can effectively repair distorted electromagnetic wave phases and improve communication capacity and radar imaging resolution.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Optics
Huibin Zhou, Hao Song, Zhe Zhao, Runzhou Zhang, Haoqian Song, Kai Pang, Kaiheng Zou, Cong Liu, Xinzhou Su, Nanzhe Hu, Robert Bock, Brittany Lynn, Moshe Tur, Alan E. Willner
Summary: The modal properties of a beam carrying orbital angular momentum generated by a circular array of multiple micro-ring emitters were investigated analytically and via simulation. The output beam consists of N vortex beams with the same OAM-order at the same wavelength, forming equidistant spectral components surrounding the central OAM-order with a spacing equal to N. The envelope of the OAM spectrum broadens with increased radius of the circular array or OAM-order value.
Article
Chemistry, Physical
Xiaoning Zang, Nirpendra Singh, Mark T. Lusk, Udo Schwingenschloegl
Summary: This study explores the use of carbon nanotubes to convert the orbital angular momentum of light into excitons, which is more suitable for quantum information processing. Through analytical analysis and numerical simulation, it is demonstrated that carbon nanotubes can conserve the orbital angular momentum when illuminated by specific radially polarized, twisted light, and they can convert the light's angular momentum into excitons. This research suggests that carbon nanotubes are promising candidates for constructing optoelectronic circuits that can process quantum information more readily in the form of excitons.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Xiyuan Lu, Mingkang Wang, Feng Zhou, Mikkel Heuck, Wenqi Zhu, Vladimir A. Aksyuk, Dirk R. Englund, Kartik Srinivasan
Summary: The authors demonstrate a method for generating orbital angular momentum (OAM) using photonic crystal ring resonators, while maintaining high cavity quality factors (up to 10^6). By ejecting high angular momentum states of a whispering gallery mode (WGM) microresonator through a grating-assisted mechanism, a scalable and chip-integrated solution for OAM generation is achieved.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Sebastien Designolle, Vatshal Srivastav, Roope Uola, Natalia Herrera Valencia, Will McCutcheon, Mehul Malik, Nicolas Brunner
Summary: This study theoretically formalizes and experimentally demonstrates a notion of genuine high-dimensional quantum steering, showing that higher-dimensional quantum entanglement can lead to stronger steering. Simple two-setting steering inequalities are derived to certify the presence of genuine high-dimensional steering, based on the connection between steering and incompatibility of quantum measurements. The experimental violation of these inequalities using macropixel photon-pair entanglement certifies genuine high-dimensional steering, with a reported minimum Schmidt number of n = 15 for an entangled state in dimension d = 31.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Daan Stellinga, David B. Phillips, Simon Peter Mekhail, Adam Selyem, Sergey Turtaev, Tomas Cizmar, Miles J. Padgett
Summary: The study demonstrates high-speed 3D imaging through multimode fibers and correction of aberrations using wavefront shaping. This research applies far-field depth-resolving capabilities to ultrathin microendoscopes, with potential applications in clinical and remote inspection scenarios.
Article
Multidisciplinary Sciences
T. Gregory, P-A Moreau, S. Mekhail, O. Wolley, M. J. Padgett
Summary: An improved quantum illumination protocol is proposed in this study, which can reject up to >= 99.9% of background light and sensor noise in the low photon flux regime without the need for scene information or noise statistics. This enhancement enables extremely low light quantum imaging techniques to be applied in previously challenging environments, contributing to the development of covert imaging, quantum microscopes, and quantum LIDAR.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Po-Cheng Lin, Graham M. Gibson, Miles J. Padgett
Summary: This work demonstrates the real-time visualization of the orbital angular momentum (OAM) carrying acoustic waveform and the optimization of high-order OAM states. The methods used in this study could also be beneficial for other applications requiring acoustic waveform shaping.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Quantum Science & Technology
Mehul Malik, Elizabeth Agudelo, Ravi Kunjwal
Summary: Strict global immigration policies and the COVID-19 pandemic have created significant hurdles for the mobility of researchers, especially quantum researchers. High visa fees, difficulties in navigating foreign immigration systems, lack of family support, and targeted government policies have severely impacted their ability to cross physical and scientific borders. Implementing good practices on governmental, institutional, and societal levels can help overcome these challenges and ensure that quantum scientists can achieve their fullest potential.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Applied
Vatshal Srivastav, Natalia Herrera Valencia, Saroch Leedumrongwatthanakun, Will McCutcheon, Mehul Malik
Summary: This study presents an accurate and efficient characterization of photonic position-momentum entanglement, proposing the collected joint-transverse momentum amplitude (JTMA) and demonstrating its reconstruction using the 2Dp measurement method. By precisely understanding the collected JTMA, tailored high-dimensional entangled states can be generated and critical experimental parameters can be optimized. This research unlocks the potential of photonic position-momentum entanglement and lays the foundation for multimode entanglement-based quantum technologies.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Steven Johnson, Alex McMillan, Stefan Frick, John Rarity, Miles Padgett
Summary: A limitation of free-space optical communications is the ease of interception, which can be overcome by hiding information within background optical noise. We demonstrate image transfer over free-space using a photon-pair source emitting two correlated beams. One beam contains image information with added noise, while the other correlated beam serves as a heralding trigger to differentiate the image signal from background noise. The system utilizes spontaneous parametric down-conversion and a gated intensified camera to extract the image from the noise.
Article
Physics, Multidisciplinary
Vatshal Srivastav, Natalia Herrera Valencia, Will McCutcheon, Saroch Leedumrongwatthanakun, Sebastien Designolle, Roope Uola, Nicolas Brunner, Mehul Malik
Summary: The establishment of quantum nonlocal correlations is crucial for a robust and unconditionally secure quantum network. We introduce a test of quantum steering that utilizes high-dimensional entanglement to be noise robust and loss tolerant. Experimental results demonstrate the significant resource advantages of high-dimensional entanglement in terms of loss, noise, and measurement time for quantum steering.
Article
Physics, Multidisciplinary
Suraj Goel, Max Tyler, Feng Zhu, Saroch Leedumrongwatthanakun, Mehul Malik, Jonathan Leach
Summary: Efficient manipulation, sorting, and measurement of optical modes and single-photon states are achieved in this study. The researchers use a specially designed multiplane light converter to simultaneously and efficiently sort nonorthogonal, overlapping states of light encoded in the transverse spatial degree of freedom. This has implications for optimal image identification and classification in optical networks.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Konstantin Y. Bliokh, Ebrahim Karimi, Miles J. Padgett, Miguel A. Alonso, Mark R. Dennis, Angela Dudley, Andrew Forbes, Sina Zahedpour, Scott W. Hancock, Howard M. Milchberg, Stefan Rotter, Franco Nori, Sahin K. Ozdemir, Nicholas Bender, Hui Cao, Paul B. Corkum, Carlos Hernandez-Garcia, Haoran Ren, Yuri Kivshar, Mario G. Silveirinha, Nader Engheta, Arno Rauschenbeutel, Philipp Schneeweiss, Juergen Volz, Daniel Leykam, Daria A. Smirnova, Kexiu Rong, Bo Wang, Erez Hasman, Michela F. Picardi, Anatoly Zayats, Francisco J. Rodriguez-Fortuno, Chenwen Yang, Jie Ren, Alexander B. Khanikaev, Andrea Alu, Etienne Brasselet, Michael Shats, Jo Verbeeck, Peter Schattschneider, Dusan Sarenac, David G. Cory, Dmitry A. Pushin, Michael Birk, Alexey Gorlach, Ido Kaminer, Filippo Cardano, Lorenzo Marrucci, Mario Krenn, Florian Marquardt
Summary: Structured waves are found in all areas of wave physics, both classical and quantum, where the wavefields are inhomogeneous and cannot be approximated by a single plane wave. These complex wavefields with inhomogeneities are crucial in various fields such as nanooptics, photonics, quantum matter waves, acoustics, water waves, etc. This Roadmap surveys the role of structured waves in wave physics, providing background, current research, and anticipating future developments.
Article
Quantum Science & Technology
Dylan Danese, Sabine Wollmann, Saroch Leedumrongwatthanakun, Will McCutcheon, Manuel Erhard, William N. Plick, Mehul Malik
Summary: We demonstrate the generation of unbalanced two-photon entanglement in the Laguerre-Gaussian (LG) transverse-spatial degree-of-freedom, and verify the coherence of the two photons using a twisted quantum eraser. This type of entanglement is likely to have a significant impact on quantum physicists.
AVS QUANTUM SCIENCE
(2023)
Article
Optics
Sara Restuccia, Graham M. Gibson, Leroy Cronin, Miles J. Padgett
Summary: This study demonstrates the measurement of optical activity in a sample using an unpolarized light source, with the help of a polarization-entangled photon source. This approach allows for low light measurement and the analysis of samples that may be perturbed by polarized light.
Article
Optics
Steven Johnson, Alex McMillan, Yril Torre, Stefan Frick, John Rarity, Miles Padgett
Summary: Traditional remote sensing applications based on pulsed laser illumination are not suitable for covert operation. We present a method that uses correlated photon-pairs to perform single-pixel imaging, suppressing background light effect and improving signal-to-noise ratio.
Proceedings Paper
Engineering, Electrical & Electronic
Joseph Ho, Massimilliano Proiettil, Federico Grasselli, Peter Barrow, Mehul Malik, Alessandro Fedrizzi
Summary: The study demonstrates a proof-of-principle demonstration of four-party quantum conference agreement using photonic GHZ states transmitted in fiber, indicating the feasibility of multi-user entangled-based quantum key distribution beyond the two-party paradigm.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Article
Multidisciplinary Sciences
Akhil Kallepalli, John Innes, Miles J. Padgett
Summary: Single-pixel imaging techniques are being explored as an alternative to focal-plane detector arrays, especially in spectral regions where these arrays are not feasible. By using a phased-array modulator source and compressed sensing, image reconstruction can be achieved successfully in high noise conditions, making this technique applicable to various spectral regions.
SCIENTIFIC REPORTS
(2021)
