Article
Optics
Yifan Zhu, Wenqi Wei, Ailun Yi, Tingting Jin, Chen Shen, Xudong Wang, Liping Zhou, Chengli Wang, Weiwen Ou, Sannian Song, Ting Wang, Jianjun Zhang, Xin Ou, Jiaxiang Zhang
Summary: Hybrid integration of wafer-scale 4H-SiC photonic chips with InGaAs quantum dot-based single-photon sources using ion slicing technique enables efficient routing of single-photon emission and integrated photon splitting operation.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Lukas Elsinger, Robin Petit, Frederik Van Acker, Natalia K. Zawacka, Ivo Tanghe, Kristiaan Neyts, Christophe Detavernier, Pieter Geiregat, Zeger Hens, Dries Van Thourhout
Summary: Colloidal quantum dots (QDs) are shown to be a promising light source for visible photonics, with integrated LED devices featuring high current density, power density, and low dark current. These devices are expected to find applications in absorption spectroscopy, bio-sensing, and could potentially be used for building electrically pumped lasers at a low cost.
LASER & PHOTONICS REVIEWS
(2021)
Article
Quantum Science & Technology
Woong Bae Jeon, Jong Sung Moon, Kyu-Young Kim, Young-Ho Ko, Christopher J. K. Richardson, Edo Waks, Je-Hyung Kim
Summary: This study demonstrates a highly efficient fiber-interfacing photonic device that launches single photons from quantum dots directly into a standard single-mode fiber. The device utilizes optimized photonic structures and a precise pick-and-place technique, resulting in a plug-and-play single-photon device.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Sunny Gupta, Wenjing Wu, Shengxi Huang, Boris I. Yakobson
Summary: Single photons, known as flying qubits, have great potential for scalable quantum technologies. However, finding an ideal single-photon emitter (SPE) is a challenge. Recent research has shown that two-dimensional (2D) materials are promising hosts for bright SPEs operating at ambient conditions. This Perspective examines the metrics required for an SPE source and highlights the interesting physical effects exhibited by 2D materials, which make them excellent candidates. The performance of SPE candidates in hexagonal boron nitride and transition metal dichalcogenides will be assessed, along with the remaining challenges and strategies to overcome them.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Taojie Zhou, Mingchu Tang, Haochuan Li, Zhan Zhang, Yuzhou Cui, Jae-Seong Park, Markel Martin, Thierry Baron, Siming Chen, Huiyun Liu, Zhaoyu Zhang
Summary: In this work, we report the fabrication of 1.3μm InAs/GaAs quantum-dot photonic-crystal nanobeam lasers directly grown on Si substrates. These lasers exhibit ultra-low energy consumption and small modal volume, making them a promising candidate for on-chip light sources in Si photonic integrated circuits.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Michele Zenari, Matteo Buffolo, Carlo De Santi, Justin Norman, Eamonn T. Hughes, John E. Bowers, Robert Herrick, Gaudenzio Meneghesso, Enrico Zanoni, Matteo Meneghini
Summary: We propose a novel methodology to evaluate the contribution of different recombination processes in below-threshold quantum dot laser diodes (QD LDs). The results show that the optical degradation of QD LDs is mainly caused by an increase in the concentration of nonradiative recombination centers, leading to a decrease in injection efficiency. This study is of fundamental importance for improving the design of LDs.
Article
Engineering, Electrical & Electronic
Jorge Parra, Todora Ivanova, Mariela Menghini, Pia Homm, Jean-Pierre Locquet, Pablo Sanchis
Summary: Vanadium dioxide (VO2) is a promising material for developing hybrid photonic integrated circuits (PICs) due to its insulating-to-metal transition triggered by light. All-optical absorption switch using a hybrid VO2/Si waveguide is demonstrated with fast switching speed and low energy consumption, showing potential for developing all-optical and broadband silicon PICs.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Mingjin Wang, Wenzhen Liu, Yuanbo Xu, Ting Fu, Jingxuan Chen, Wanhua Zheng
Summary: A single-chip hybrid integrated silicon photonics transmitter based on passive alignment flip-chip bonding technology is demonstrated. The transmitter is developed by integrating a C-band slotted laser with 1mm cavity length and a Mach-Zehnder modulator with 2mm long phase shifter. A 3 dB bandwidth of 16.35 GHz is achieved with a small signal response superimposed with a reverse bias voltage of 2.43V at 5.99 VPP. A 25 Gbps data transmission experiment is performed at 25 degrees C.
Article
Quantum Science & Technology
Ali W. Elshaari, Anas Skalli, Samuel Gyger, Martin Nurizzo, Lucas Schweickert, Iman Esmaeil Zadeh, Mikael Svedendahl, Stephan Steinhauer, Val Zwiller
Summary: Hybrid integration provides an important avenue for incorporating atom-like solid-state single-photon emitters into photonic platforms. Hexagonal boron nitride (hBN) is particularly interesting quantum emitter for hybrid integration, as it provides a route for room-temperature quantum photonic technologies. Despite recent progress, a deterministic, site-controlled process for integrating hBN emitters in photonic waveguides remains elusive.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Nanoscience & Nanotechnology
Alexander Eich, Tobias C. Spiekermann, Helge Gehring, Lisa Sommer, Julian R. Bankwitz, Philip P. J. Schrinner, Johann A. Preuss, Steffen Michaelis de Vasconcellos, Rudolf Bratschitsch, Wolfram H. P. Pernice, Carsten Schuck
Summary: This study reports on the integration of individual colloidal core-shell quantum dots into a nanophotonic network, allowing for excitation and efficient collection of single photons through separate waveguide channels. The use of an iterative electron beam lithography process enables the positioning of single emitters on a chip with a high yield. This work goes beyond traditional bulk optic methods and provides a pathway for supplying chip-scale quantum networks with single photons from a large number of simultaneously controllable quantum emitters.
Article
Chemistry, Physical
Lu Zhang, Haiyang Hong, Kun Qian, Songsong Wu, Guangyang Lin, Jianyuan Wang, Wei Huang, Songyan Chen, Cheng Li
Summary: In this study, a highly controllable method for synthesizing GeSn quantum dots in a CMOS compatible way was demonstrated, resulting in high area density, high-Sn fraction, and narrow size distribution of the GeSn quantum dots. The properties of the GeSn quantum dots can be well controlled by adjusting the preparation temperature.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Minho Choi, Mireu Lee, Sung-Yul L. Park, Byung Su Kim, Seongmoon Jun, Suk In Park, Jin Dong Song, Young-Ho Ko, Yong-Hoon Cho
Summary: In this study, a method is proposed to deterministically integrate single quantum dots with tailor-made photonic structures. A nondestructive luminescence picking method called nanoscale-focus pinspot (NFP) is used to reduce the luminous quantum dot density. The selected quantum dot is then deterministically integrated with a tailor-made photonic structure, leading to improved extraction efficiency.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Eamonn T. Hughes, Gunnar Kusch, Jennifer Selvidge, Bastien Bonef, Justin Norman, Chen Shang, John E. Bowers, Rachel A. Oliver, Kunal Mukherjee
Summary: This study explores the impact of dislocations on carrier lifetimes, growth morphology, and luminescence in InAs quantum dots (QD) grown on silicon. The results show that dislocations significantly reduce carrier lifetimes, even in the presence of three-dimensional confinement. Additionally, misfit dislocations in the defect filter layers can induce crosshatch-like variations in QD emission color and intensity. This research provides valuable insights into the development of light sources for scalable silicon photonic integrated circuits.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Physics, Applied
Michele Zenari, Matteo Buffolo, Carlo De Santi, Justin Norman, Gaudenzio Meneghesso, John E. Bowers, Enrico Zanoni, Matteo Meneghini
Summary: This study aims to identify, analyze and compare defects in III-As materials based on dislocation density and the presence/absence of quantum dots. Results show that the type and location of defects in III-As materials vary when grown on different substrates with varying dislocation densities.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Optics
Kazuhiro Kuruma, Hironobu Yoshimi, Yasutomo Ota, Ryota Katsumi, Masahiro Kakuda, Yasuhiko Arakawa, Satoshi Iwamoto
Summary: This study reports single-photon sources using single quantum dots embedded in topological slow light waveguides based on valley photonic crystals. The experiment demonstrates Purcell-enhanced single-photon emission in a topological slow light mode with a group index over 20, showing robust propagation even under sharp bends.
LASER & PHOTONICS REVIEWS
(2022)
Article
Nanoscience & Nanotechnology
Ting-Yuan Chang, Hyunseok Kim, William A. Hubbard, Khalifa M. Azizur-Rahman, Jung Jin Ju, Je-Hyung Kim, Wook-Jae Lee, Diana Huffaker
Summary: This article reports on the monolithic integration of InAsP quantum dots embedded in InP nanowires on silicon, showing potential for building next-generation quantum light sources.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Multidisciplinary Sciences
Jordan Goldstein, Hongtao Lin, Skylar Deckoff-Jones, Marek Hempel, Ang-Yu Lu, Kathleen A. Richardson, Tomas Palacios, Jing Kong, Juejun Hu, Dirk Englund
Summary: This article discusses the importance of mid-infrared photonic integrated circuits (PICs) in sensing and optical communications, as well as the current limitation in operational wavelengths. The authors successfully developed photothermoelectric graphene photodetectors in a chalcogenide glass-on-CaF2 PIC, operating at 5.2 μm, showing promising results for gas sensing applications.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Ryan Hamerly, Saumil Bandyopadhyay, Dirk Englund
Summary: In this study, a new configuration algorithm is proposed to overcome the limitations of rectangular mesh interferometers in terms of fabrication errors and reduce the impact of errors on the performance of the interferometer. The algorithm is robust, requires no prior knowledge of process variations, and relies only on external sources and detectors.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Ryan Hamerly, Saumil Bandyopadhyay, Dirk Englund
Summary: This paper highlights the importance of algorithmic stability in self-configuration and proposes a self-configuration scheme for both triangular and rectangular meshes.
PHYSICAL REVIEW APPLIED
(2022)
Article
Quantum Science & Technology
Yuan Lee, Eric Bersin, Axel Dahlberg, Stephanie Wehner, Dirk Englund
Summary: The past decade has seen significant progress in experimentally realizing the building blocks of quantum repeaters. A quantum router architecture comprising many quantum memories connected in a photonic switchboard has been proposed to maintain entanglement fidelity over long-distance links and improve entanglement distribution rates. This architecture enables channel-loss-invariant fidelity and automatically prioritizes entanglement flows across the network, without requiring global network information.
NPJ QUANTUM INFORMATION
(2022)
Article
Optics
Junghyun Sung, Dongjin Shin, HyunHee Cho, Seong Won Lee, Seungmin Park, Young Duck Kim, Jong Sung Moon, Je-Hyung Kim, Su-Hyun Gong
Summary: In this study, indirect-bandgap transition lasing under continuous-wave excitation at room temperature is demonstrated in an ultra-thin WS2 disk. It is shown that a 50-nm-thick WS2 disk provides sufficient optical gain and whispering gallery modes for lasing action. These results offer a new direction for van-der-Waals-material-based nanophotonics and introduce the possibility for optical devices based on indirect-bandgap materials.
Article
Optics
Rui Tang, Makoto Okano, Kasidit Toprasertpong, Shinichi Takagi, Dirk Englund, Mitsuru Takenaka
Summary: This study proposes a novel photonic integrated circuit (PIC) architecture for accelerated matrix multiplication, addressing the issue of hardware errors increasing with device scale in previous architectures. Additionally, a PIC architecture for general matrix-matrix multiplication (GEMM) is developed to enable high-energy efficiency computing on photonic chips.
Article
Physics, Applied
Hyeongrak Choi, Lamia Ateshian, Mikkel Heuck, Dirk Englund
Summary: The majority of coherent optical radiation sources rely on laser oscillators driven by population inversion. However, accessing the frequency range of 0.1-10 THz (the terahertz gap) remains a challenge. This study proposes a method to produce coherent radiation spanning the THz gap using low-loss dielectric structures. The approach shows potential for high conversion efficiencies and the ability to bridge the THz gap with only 1 W of input power.
PHYSICAL REVIEW APPLIED
(2022)
Article
Nanoscience & Nanotechnology
Jasvith Raj Basani, Sri Krishna Vadlamani, Saumil Bandyopadhyay, Dirk R. R. Englund, Ryan Hamerly
Summary: This paper presents a novel architecture for multiport interferometers based on the sine-cosine fractal decomposition of a unitary matrix. The unique self-similarity and modularity of our design offer improved resilience to hardware imperfections compared to conventional multiport interferometers. Numerical simulations show that truncation of these meshes gives robust performance even under large fabrication errors, making it a significant advancement in large-scale programmable photonics for practical machine learning and quantum computing applications.
Article
Nanoscience & Nanotechnology
Laura Kim, Hyeongrak Choi, Matthew E. E. Trusheim, Hanfeng Wang, Dirk R. R. Englund
Summary: Nitrogen vacancy centers in diamond provide a spin-based qubit system with long coherence time even at room temperature, making them suitable ambient-condition quantum sensors for quantities including electromagnetic fields, temperature, and rotation. The optically addressable level structures of NV spins allow transduction of spin information onto light-field intensity. The sub-optimal readout fidelity of conventional fluorescence measurement remains a significant drawback for room-temperature ensemble sensing. Here, we discuss nanophotonic interfaces that provide opportunities to achieve near-unity readout fidelity based on IR absorption via resonantly enhanced spin-optic coupling. Spin-coupled resonant nanophotonic devices are projected to particularly benefit applications that utilize micro- to nanoscale sensing volume and to outperform present methods in their volume-normalized sensitivity.
Article
Multidisciplinary Sciences
Hanfeng Wang, Matthew E. Trusheim, Laura Kim, Hamza Raniwala, Dirk R. Englund
Summary: This study proposes a programmable architecture based on diamond color centers driven by electric or strain fields, aiming to reduce power consumption and cross-talk constraints in large-scale quantum networks. By densely packing diamond color centers in a programmable electrode array and driving quantum gates with electric or strain fields, this 'field programmable spin array’ (FPSA) enables high-speed control of individual color centers with low cross-talk and power dissipation. Integrated with a slow-light waveguide for efficient optical coupling, the FPSA serves as a quantum interface for optically-mediated entanglement, showing increased entanglement generation rate scaling into the thousand-qubit regime.
NATURE COMMUNICATIONS
(2023)
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, Applied
Uday Saha, James D. Siverns, John Hannegan, Mihika Prabhu, Qudsia Quraishi, Dirk Englund, Edo Waks
Summary: In this work, we demonstrate the routing of single photons from a trapped ion using a photonic integrated circuit. The emission of the ion is matched to the operating wavelength of the circuit through quantum frequency conversion. Programmable phase shifters are used to switch the single photons between output channels and achieve a 50:50 beam splitting condition. These results are important for programmable routing and entanglement distribution in large-scale quantum networks and distributed quantum computers.
PHYSICAL REVIEW APPLIED
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Alexander Sludds, Ryan Hamerly, Saumil Bandyopadhyay, Zhizhen Zhong, Zaijun Chen, Liane Bernstein, Manya Ghobadi, Dirk Englund
Summary: In this paper, we present experimental demonstrations of ultra-low power edge computing enabled by wavelength division multiplexed optical links and time-integrating optical receivers. The initial experiments show optical energy per MAC less than or similar to 10 fJ.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
Article
Quantum Science & Technology
Woong Bae Jeon, Jong Sung Moon, Kyu-Young Kim, Young-Ho Ko, Christopher J. K. Richardson, Edo Waks, Je-Hyung Kim
Summary: This study demonstrates a highly efficient fiber-interfacing photonic device that launches single photons from quantum dots directly into a standard single-mode fiber. The device utilizes optimized photonic structures and a precise pick-and-place technique, resulting in a plug-and-play single-photon device.
ADVANCED QUANTUM TECHNOLOGIES
(2022)