Article
Physics, Multidisciplinary
Markus Hiekkamaki, Robert Fickler
Summary: Two-photon interference in multiple transverse-spatial modes along a single beam-path was studied, with observations of coalescence and anticoalescence in different spatial-mode multiports. This operation within spatial modes along a single beam path eliminates the need for interferometric stability and presents new pathways for implementing complex quantum information tasks using linear optical networks.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Jincheng Ni, Shengyun Ji, Zhenyu Wang, Shunli Liu, Yanlei Hu, Yang Chen, Jiawen Li, Xiangping Li, Jiaru Chu, Dong Wu, Cheng-Wei Qiu
Summary: Researchers report an optical control method for unidirectional emission of unpolarized luminescence assisted by photonic orbital angular momenta. The orientation of anti-Stokes shift PL emissions can be controlled by the helicity of incident vortex beams. The experimental directionality of unpolarized PL emission in the one-dimensional nanopillar lattice can reach 0.59, which is significantly stronger than that possible by a spin mechanism. These findings offer a new promising approach for tunable nanoscale optical control of emission.
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
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
Optics
Yujia Wu, Haigang Liu, Xianfeng Chen
Summary: This study introduces a method for measuring optical near-infrared vortex modes with frequency upconversion, which can convert a near-infrared beam into a visible beam. The number and orientation of fringes of the second harmonic intensity patterns are used to measure the optical near-infrared vortex modes. This proposed method offers a convenient and flexible way to measure different OAM of vortex beams, with potential applications in various circumstances involving vortex modes.
Article
Quantum Science & Technology
Yuanyuan Chen, Sebastian Ecker, Lixiang Chen, Fabian Steinlechner, Marcus Huber, Rupert Ursin
Summary: High-dimensional quantum entanglement is a prolific field in quantum information processing due to its high information capacity and error resilience. The study successfully manipulated high-dimensional entanglement using Hong-Ou-Mandel interference and investigated the generation and characterization of frequency entangled qudits in different dimensions both theoretically and experimentally.
NPJ QUANTUM INFORMATION
(2021)
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
Optics
Baghdasar Baghdasaryan, Carlos Sevilla-Gutierrez, Fabian Steinlechner, Stephan Fritzsche
Summary: This study derives a general expression for the spatio-temporal biphoton state in common experimental settings, which correctly describes the nonseparability of spatial and spectral modes. By considering the Gouy phase of interacting beams, a criterion on how to decrease the coupling between spatial and spectral degrees of freedom is formulated. This work provides new insights into the role of the Gouy phase in SPDC and the preparation of engineered entangled states for multidimensional quantum information processing.
Article
Optics
A. A. Peshkov, Y. M. Bidasyuk, R. Lange, N. Huntemann, E. Peik, A. Surzhykov
Summary: We have conducted a theoretical study on the nondipole excitation of a single trapped atom by twisted light, with a focus on the interplay between the internal and vibrational degrees of freedom of an atom. By using the density-matrix approach based on the Liouville-von Neumann equation, we obtained a quantum mechanical understanding of the excitation process. Our theory was applied to the 4s 2S1/2 -> 3d 2D5/2 electric quadrupole (E2) transition in a 40Ca+ ion induced by Laguerre-Gaussian modes, revealing unconventional anharmonic Rabi oscillations attributed to the strong coupling between vibrational levels of the trap.
Article
Physics, Multidisciplinary
Li-Ping Yang, Zubin Jacob
Summary: This study derives the quantum state of structured photons from quantum field theory, capturing the quantum uncertainty in angular momentum and non-local photonic spin density correlations. It introduces the concept of quantum structured light and explores quantum noise and photon statistics of three-dimensional photonic angular momentum in twisted light pulses.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
Felix Stopp, Maurizio Verde, Milton Katz, Martin Drechsler, Christian T. Schmiegelow, Ferdinand Schmidt-Kaler
Summary: Using a structured light beam, researchers demonstrate the ability to control the motion of a single atom in different directions, which has potential applications in quantum computing and simulations. The researchers observe coherent dynamics and strong carrier suppression, and quantify the transverse momentum transfer between the atom and the beam.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
Zainab Jawad Kadhim, Rathab Abbass, Hussein Humedy Chlib Alkaaby, Samar Emad Izzat, Marwah A. Shams, Ayat Hussein Adhab, Athmar Ali Kadhim
Summary: In this paper, we investigate how the exchange efficiency in a V-type atomic system is affected by the superposition of two upper states and the quantum interference effect. We demonstrate that the orbital angular momentum can generate an additional signal field in response to a single optical vortex light on one transition of the V-type quantum system. We also discuss the impact of quantum interference term, probe's detuning, and the superposition of higher states on the exchange efficiency of optical vorticity. Our model shows great potential for quantum information processing based on the orbital angular momentum of light due to the enhanced exchange efficiency.
MODERN PHYSICS LETTERS B
(2022)
Article
Optics
Kai Pang, Kaiheng Zou, Hao Song, Zhe Zhao, Amir Minoofar, Runzhou Zhang, Haoqian Song, Huibin Zhou, Xinzhou Su, Cong Liu, Nanzhe Hu, Moshe Tur, Alan E. Willner
Summary: By coherently combining multiple frequencies, near-diffraction-free and near-dispersion-free OAM pulses with arbitrary group velocities have been generated. It has been found that both positive and negative group velocities can be achieved and continuously controlled, and that the simulated value of group velocity remains the same when the topological charge l is varied. However, as the l value increases, the pulse duration becomes longer for a given number of frequency lines.
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.
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.
