Article
Optics
Lifeng Duan, Aojie Xu, Yun Zhang
Summary: In this study, we characterize the spectral properties of two-photon nonclassical interference and consider factors such as average photon number and noise. The results show that subtracting the two-photon contributions from the input state can significantly improve two-photon interference, opening up new possibilities for the application of independent source two-photon interference in quantum information technology.
Article
Optics
Robert Lindberg, Xiao Liu, Andrius Zukauskas, Siddharth Ramachandran, Valdas Pasiskevicius
Summary: In this study, frequency doubling of focused Bessel-like higher order fiber modes was successfully achieved in a one-dimensionally quasi-phase matched structured KTP crystal, with a maximum conversion efficiency of 48%. By optimizing the phase mismatch, clean on-axis conversion was demonstrated, resulting in brightness enhancement. Brightness enhancement was achieved through cascaded chi((2)) : chi((2)) processes.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Zhe Hu, Yang Han, Amr S. Zalhaf, Siyu Zhou, Ensheng Zhao, Ping Yang
Summary: The future of power systems is shifting towards renewable energy sources and power electronic devices, leading to an increase in power quality issues. This paper provides a comprehensive review on the common models of harmonic sources in modern power systems and offers insight into their circuit mechanisms, mathematical models, and operational processes. It also examines the harmonic characteristics of various sources in typical operating scenarios and discusses the future development directions of harmonic analysis and control in the context of modern power systems.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Optics
Kuang-Yu Chang, Long-Cheng Huang, Koji Asaga, Ming-Shian Tsai, Laura Rego, Pei-Chi Huang, Hiroki Mashiko, Katsuya Oguri, Carlos Hernandez-Garcia, Ming-Chang Chen
Summary: Polarization engineering and characterization of coherent high-frequency radiation are crucial for understanding and controlling light-matter interaction phenomena. This study demonstrates the ability to fully retrieve both the amplitude and phase of a strong-field-driven dipole response using polarization control and characterization of high-harmonic generation. By adjusting the ellipticity of driving pulses, the polarization state of high-harmonic orders can be tuned, providing a novel technique for high-harmonic spectroscopy and attosecond metrology with single-digit attosecond accuracy.
Article
Optics
Pavel Peterka, Zbynek Soban, Frantisek Trojanek, Petr Maly, Martin Kozak
Summary: This paper reports on the enhancement of high harmonic generation (HHG) yield using a metasurface made of amorphous silicon disks. The structure was designed and optimized to achieve a 20-fold enhancement compared to an unstructured surface. A broadband magnetic resonance mode enhanced the local field, allowing the use of ultrashort laser pulses as short as 40 fs. Due to the anisotropic structure of the metasurface, both the local-field enhancement and the HHG yield exhibit strong polarization anisotropy.
Article
Optics
Joana Duarte, Aura Ines Gonzalez, Remy Cassin, Rana Nicolas, Maria Kholodstova, Willem Boutu, Marta Fajardo, Hamed Merdji
Summary: This paper introduces a method for single-shot measurement of spatial coherence of a light source using a specific arrangement of a two-dimensional non-redundant array of apertures. This method eliminates the need for parallel measurement of beam intensity and is robust against beam-pointing instabilities. Experimental validation demonstrates the strong robustness of the method in different regimes.
Article
Chemistry, Multidisciplinary
Hai Peng Wang, Yun Bo Li, Shi Yu Wang, Jia Lin Shen, He Li, Shi Jin, Tie Jun Cui
Summary: In the past few decades, metasurfaces have shown great potential in manipulating light and electromagnetic waves, with a particular focus on second-harmonic generation (SHG) due to its diverse applications. While previous research has focused on achieving SHG in optical materials with low efficiency, this study presents high-efficiency SHG of spatial waves in the microwave frequency using a nonlinear metasurface loaded with active chips. The new approach demonstrates spatial-wave frequency multiplication with an efficient signal transformation, validated through proof-of-concept experiments with an 85.11% efficiency under normal incidence.
Article
Multidisciplinary Sciences
Maxim R. Shcherbakov, Haizhong Zhang, Michael Tripepi, Giovanni Sartorello, Noah Talisa, Abdallah AlShafey, Zhiyuan Fan, Justin Twardowski, Leonid A. Krivitsky, Arseniy Kuznetsov, Enam Chowdhury, Gennady Shvets
Summary: The researchers demonstrated highly efficient high harmonic generation on a nanoscale platform using a resonant gallium phosphide metasurface, which covers a wide range of photon energies while minimizing reabsorption and material damage. This study facilitates the exploration of the controllable transition between perturbative and non-perturbative regimes of light-matter interactions at the nanoscale.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Nazanin Samadi, Xianbo Shi, Cigdem Ozkan Loch, Juraj Krempasky, Michael Boege, Dean Chapman, Marco Stampanoni
Summary: This study introduces an X-ray beam property analyzer based on a multi-crystal diffraction geometry, which can be used for measuring and monitoring the spatial properties of X-ray sources, such as source size and divergence. The experimental validation demonstrates the feasibility of this system in terms of measurement sensitivity and versatility.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
S. Szoke, M. He, B. P. Hickam, S. K. Cushing
Summary: Entangled photon spectroscopy, a nascent field, has implications for measurement and imaging in chemical, biology, and materials fields. It offers improved spatial and temporal-resolution, increased cross sections for multiphoton and nonlinear measurements, and abilities in inducing or measuring quantum correlations. High-flux entangled sources are essential for this technique, and the research reports on a platform that generates entangled photon pairs efficiently.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Optics
Zijian Cui, Mingying Sun, DE'An Liu, Jianqiang Zhu
Summary: This study presents high-peak-power picosecond deep-UV laser sources and characterizes typical birefringent and nonlinear borate crystals. The demonstrated results contribute to the development of ultrahigh-peak-power deep-UV and vacuum-UV laser sources as well as important applications in high-energy-density physics, material science, and laser machining.
Article
Chemistry, Multidisciplinary
Vittoria Petrillo, Illya Drebot, Marcel Ruijter, Sanae Samsam, Alberto Bacci, Camilla Curatolo, Michele Opromolla, Marcello Rossetti Conti, Andrea Renato Rossi, Luca Serafini
Summary: In this paper, the authors provide an overview of the Compton interaction process and analyze different paradigms of Inverse Compton Sources, including implemented or commissioning projects and proposed future projects. They discuss the state of the art and highlight the most challenging issues.
APPLIED SCIENCES-BASEL
(2023)
Article
Astronomy & Astrophysics
Han Yan, Xian Chen, Alejandro Torres-Orjuela
Summary: The possibility of high c.m. velocities in gravitational-wave sources near supermassive black holes requires a method of deriving waveforms in the observer's frame. This study shows that when c.m. velocity is high and source component relative velocities are small, the waveform can be derived by integrating the relaxed Einstein field equation. The results, expanded into multipole components, match the Lorentz transformation of gravitational waves to the leading order of the radiation field.
Article
Optics
Yu-Mu Liu, Jing Cheng, Hong-Fu Wang, Xuexi Yi
Summary: We propose a scheme to achieve nonreciprocal conventional photon blockades simultaneously in two independent optical modes, which are connected by a two-level system. By driving the nonlinear device from one side, single-photon blockades happen, while photon-induced tunneling appears when driving the system from the other side. Based on photon resonance transition processes, four optimal Fizeau-Sagnac shifts can be obtained to generate perfect nonreciprocal conventional photon blockades. This study opens an avenue to simultaneously manipulate multiple nonreciprocal single-photon devices and may have potential applications in chiral quantum information processing.
Article
Multidisciplinary Sciences
Yudong Yang, Roland E. Mainz, Giulio Maria Rossi, Fabian Scheiba, Miguel A. Silva-Toledo, Phillip D. Keathley, Giovanni Cirmi, Franz X. Kartner
Summary: Attosecond science can reveal fundamental electronic dynamics in matter by improving spectral tunability and increasing photon flux in high-order harmonic sources. Parametric waveform synthesis enables the generation of highly-tunable isolated attosecond pulses, with central energy, spectral bandwidth/shape, and temporal duration controlled by shaping laser waveforms through relative-phase and carrier-envelope phase parameters. This advancement not only expands experimental possibilities in attosecond science, but also demonstrates coherent strong-field control of free-electron trajectories using tailored optical waveforms.
NATURE COMMUNICATIONS
(2021)
Article
Optics
D. Main, T. M. Hird, S. Gao, I. A. Walmsley, P. M. Ledingham
Summary: This study demonstrates coherent storage and retrieval of pulsed light using the atomic frequency comb protocol in room temperature alkali vapor. Multiple velocity classes in the ground state of cesium are prepared using velocity-selective optical pumping. Utilizing two transitions in the comb enhances recall efficiency through an interference effect upon rephasing.
Article
Optics
M. Nicolle, J. N. Becker, C. Weinzetl, I. A. Walmsley, P. M. Ledingham
Summary: In this experiment, a cryogenically cooled Pr3+ : Y2SiO5 crystal was used to implement a broadband rephasing protocol for the atomic frequency comb (AFC). The study investigated the efficiency of AFC preparation parameters and observed up to 12 rephased temporal modes with a suboptimal AFC.
Correction
Optics
Brian J. Smith, Emmy Killett, M. G. Raymer, I. A. Walmsley, K. Banaszek
Article
Optics
G. S. Thekkadath, S. Sempere-Llagostera, B. A. Bell, R. B. Patel, M. S. Kim, I. A. Walmsley
Summary: In this study, the discrimination of binary-phase-shifted coherent states at a telecom wavelength was successfully achieved using a photon-number-resolving detector, the transition-edge sensor, resulting in a bit error probability that exceeds the standard quantum limit by up to 7.7 dB. This improvement persists for signals containing up to approximately seven photons on average and can be achieved in a single shot, making the approach compatible with larger bandwidths.
Article
Quantum Science & Technology
David Drahi, Demid Sychev, Khurram K. Pirov, Ekaterina A. Sazhina, Valeriy A. Novikov, Ian A. Walmsley, A. Lvovsky
Summary: This paper focuses on the interconversion between the dual-rail and single-rail encodings of quantum information in optical qubits. The study demonstrates the necessity of completing the conversion between the three primary encodings of a qubit in the optical field to achieve cohesive quantum networks.
Article
Optics
S. Sempere-Llagostera, G. S. Thekkadath, R. B. Patel, W. S. Kolthammer, I. A. Walmsley
Summary: In this study, we use the photon-number resolving capabilities of commercial superconducting nanowire single-photon detectors to improve the quality of single photons generated through nonlinear processes. Our results demonstrate the feasibility of enhancing the quality of heralded single-photon sources using readily available technology.
Article
Physics, Multidisciplinary
G. S. Thekkadath, B. A. Bell, R. B. Patel, M. S. Kim, I. A. Walmsley
Summary: The article presents a scheme for measuring the time-frequency structure of quantum light and demonstrates its effectiveness through experiments. The proposed method does not require phase stability, nonlinearities, or spectral shaping, making it a simple and practical way to measure the modal structure of quantum light.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Jacob F. F. Bulmer, Bryn A. Bell, Rachel S. Chadwick, Alex E. Jones, Diana Moise, Alessandro Rigazzi, Jan Thorbecke, Utz-Uwe Haus, Thomas Van Vaerenbergh, Raj B. Patel, Ian A. Walmsley, Anthony Laing
Summary: Identifying the boundary at which quantum machines provide a computational advantage over classical counterparts is crucial. Gaussian boson sampling (GBS), which involves measuring photons from a highly entangled Gaussian state, is a leading approach in pursuing quantum advantage. This paper presents faster classical GBS simulation methods and introduces an efficient distribution for classical sampling that passes various GBS validation methods.
Article
Optics
Bangshan Sun, Fyodor Morozko, Patrick S. Salter, Simon Moser, Zhikai Pong, Raj B. Patel, Ian A. Walmsley, Mohan Wang, Adir Hazan, Nicolas Barre, Alexander Jesacher, Julian Fells, Chao He, Aviad Katiyi, Zhen-Nan Tian, Alina Karabchevsky, Martin J. Booth
Summary: This paper reports a new method for femtosecond laser writing of optical-fiber-compatible glass waveguides, which enables high precision and low loss control of waveguide cross-sections. The fabricated waveguides show high refractive index contrast, low propagation loss, and low coupling loss, and they can operate across a broad range of wavelengths.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Physics, Multidisciplinary
S. Sempere-Llagostera, R. B. Patel, I. A. Walmsley, W. S. Kolthammer
Summary: Gaussian boson sampling is a concept in quantum computing that involves drawing samples from a nonclassical Gaussian state using photon-number resolving detectors. In this study, we experimentally implement Gaussian boson sampling using a time-bin encoded interferometer and find improvements in searching for dense subgraphs in a graph.
Article
Physics, Applied
S. E. Thomas, S. Sagona-Stophel, Z. Schofield, I. A. Walmsley, P. M. Ledingham
Summary: This paper reports a telecommunications wavelength- and bandwidth-compatible quantum memory, which enables efficient storage and on-demand retrieval of quantum optical states. It is an essential technology for future terrestrial-based quantum optical networking. The memory demonstrates a total internal efficiency of 20.90(1)% and a Doppler-limited storage time of 1.10(2) ns using the Off-Resonant Cascaded Absorption protocol in hot 87Rb vapor.
PHYSICAL REVIEW APPLIED
(2023)
Article
Multidisciplinary Sciences
F. H. B. Somhorst, R. van der Meer, M. Correa Anguita, R. Schadow, H. J. Snijders, M. de Goede, B. Kassenberg, P. Venderbosch, C. Taballione, J. P. Epping, H. H. van den Vlekkert, J. Timmerhuis, J. F. F. Bulmer, J. Lugani, I. A. Walmsley, P. W. H. Pinkse, J. Eisert, N. Walk, J. J. Renema
Summary: This study demonstrates that in a unitarily evolving system, single-mode measurements can converge to a thermal state using photons in an integrated optical interferometer. The resolution to the paradox between unitary evolution and the second law of thermodynamics is the recognition that the global unitary evolution of a multi-partite quantum state causes local subsystems to evolve towards maximum-entropy states. The experiment utilizes a programmable integrated quantum photonic processor to manipulate quantum states and shows the potential of photonic devices for simulating non-Gaussian states.
NATURE COMMUNICATIONS
(2023)
Proceedings Paper
Instruments & Instrumentation
Georg Enzian, Lars Freisem, John J. Price, Andreas O. Svela, Jack Clarke, Magdalena Szczykulska, Joshua Nunn, Ian Walmsley, Jonathan Silver, Leonardo Del Bino, Shuangyou Zhang, Pascal Del'Haye, Biveen Shajilal, Jiri Janousek, Ben C. Buchler, Ping Koy Lam, Michael R. Vanner
Summary: Research on backward Brillouin scattering in whispering-gallery-mode micro-resonators provides a promising avenue for both classical and quantum optomechanics applications. Our team, in collaboration with others, is utilizing this regime to prepare non-Gaussian motional states of the acoustic field. Recent experimental results include Brillouin optomechanical strong coupling, manipulation of thermal states by adding or subtracting single phonons, and phase-space tomography of non-Gaussian states generated by subtracting single or multiple phonons.
OPTICAL AND QUANTUM SENSING AND PRECISION METROLOGY II
(2022)
Article
Quantum Science & Technology
G. S. Thekkadath, S. Sempere-Llagostera, B. A. Bell, R. B. Patel, M. S. Kim, I. A. Walmsley
Summary: This paper presents a GBS machine that achieves displacement by injecting a laser beam and a two-mode squeezed vacuum state. The study shows that the machine has the ability to reconstruct multimode Gaussian state and reduce computational complexity.
Proceedings Paper
Engineering, Electrical & Electronic
Georg Enzian, John J. Price, Lars Freisem, Magdalena Szczykulska, Joshua Nunn, Ian A. Walmsley, Jonathan Silver, Leonardo Del Bino, Shuangyou Zhang, Pascal Del'Haye, Jiri Janousek, Ben C. Buchler, Ping Koy Lam, Michael R. Vanner
Summary: In this experiment, strong coupling between optical and acoustic fields was demonstrated, and single-phonon addition and subtraction operations were successfully performed.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
