Article
Materials Science, Multidisciplinary
Edith Yeung, David B. Northeast, Jeongwan Jin, Patrick Laferriere, Marek Korkusinski, Philip J. Poole, Robin L. Williams, Dan Dalacu
Summary: We have demonstrated the generation of indistinguishable photons on a chip using a nanowire quantum dot. By selecting a single nanowire from an array on a growth substrate and coupling its emission to a SiN waveguide on a Si-based chip, we achieved high-fidelity single-photon emission with negligible multiphoton probability. Both continuous-wave and pulsed excitation measurements confirmed the high visibility of two-photon interference, indicating the near-perfect nature of the single-photon source.
Article
Chemistry, Multidisciplinary
Quang Nhat Dang Lung, Rafael Jumar Chu, Yeonhwa Kim, Tsimafei Laryn, May Angelu Madarang, Oleksiy Kovalchuk, Yong-Won Song, In-Ho Lee, Changsoon Choi, Won Jun Choi, Daehwan Jung
Summary: High quantum efficiency nanoscale devices face challenges due to carrier loss at the surface. Low dimensional materials like 0D quantum dots and 2D materials have been studied to reduce the loss. In this study, we demonstrate a significant enhancement in photoluminescence from graphene/III-V quantum dot mixed-dimensional heterostructures. The distance between graphene and quantum dots in the hybrid structure determines the degree of radiative carrier recombination enhancement. Time-resolved photoluminescence decay also shows increased carrier lifetimes with decreased distance. The proposed optical enhancement mechanism involves energy band bending and hole carrier transfer, which rebalance the carrier densities in quantum dots. This 2D graphene/0D quantum dot heterostructure shows promise for high performance nanoscale optoelectronic devices.
Article
Engineering, Electrical & Electronic
Shahram Mohammadnejad, Amine Mahmoudi, Hossein Arab
Summary: In this study, the finite difference time domain method was used to simulate the emission from PbS quantum dots in a hexagonal InP nanowire as a single photon source. The effects of nanowire height, radius, dipole source location, and orientation on the Purcell factor and Quality factor of the nanowire were investigated. The optimized nanowire structure had a hexagonal cross section with a radius of 220 nm and a height of 10 μm, yielding emission peak above 1 μm with a Purcell factor of 5.45, which is suitable for single photon sources in quantum communications.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Jingwei Mu, Shaoyun Huang, Zhi-Hai Liu, Weijie Li, Ji-Yin Wang, Dong Pan, Guang-Yao Huang, Yuanjie Chen, Jianhua Zhao, H. Q. Xu
Summary: The research team successfully demonstrated a highly tunable linear quadruple QD system in a nanowire and obtained characteristic two-dimensional charge stability diagrams through electron transport measurements, providing important experimental evidence for studying multiple QD systems.
Article
Physics, Multidisciplinary
Sven Dorsch, Sofia Fahlvik, Adam Burke
Summary: The research demonstrates a device architecture where bottom-gates are capacitively coupled to a nanowire and function as local joule heaters, enabling local heating at different locations and offering rich experimental possibilities.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
Yaonan Hou, Ilias Skandalos, Mingchu Tang, Hui Jia, Huiwen Deng, Xuezhe Yu, Yasir Noori, Spyros Stathopoulos, Siming Chen, Huiyun Liu, Alwyn Seeds, Graham Reed, Frederic Gardes
Summary: We investigate the surface and interface engineering on InAs quantum dot emitters using edge-emitting light-emitting diodes encapsulated with non-stoichiometric silicon nitride (SiN) layers. Our findings show that silicon-rich SiN is an excellent choice for both electrical and optical passivation, reducing surface recombination. However, N-rich SiN deposited by the same method does not provide effective passivation under electrical injection. This research provides important insights for the monolithic integration of InAs quantum dot emitters with CMOS photonics components.
JOURNAL OF LUMINESCENCE
(2023)
Review
Materials Science, Multidisciplinary
Ziyuan Li, Zeyu He, Chenyang Xi, Fanlu Zhang, Longsibo Huang, Yang Yu, Hark Hoe Tan, Chennupati Jagadish, Lan Fu
Summary: In recent years, III-V semiconductor nanowires have been extensively studied for their applications in infrared photodetectors. This is due to their unique properties such as direct and suitable bandgap, flexibility in device design, and ability to grow on foreign substrates with more effective strain relaxation. Vertically aligned and ordered nanowire arrays have emerged as a promising platform for photodetectors, allowing for tailored light absorption and carrier transport properties. This article provides a comprehensive review of the progress in the development of various types of infrared photodetectors based on III-V semiconductor nanowire arrays, including the synthesis/fabrication methods, device performance, and emerging applications. The challenges and future perspectives for the development of low-cost, large-scale, high-performance nanowire array infrared photodetectors are also analyzed.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Ling Chen, Bowen Sheng, Shanshan Sheng, Ping Wang, Xiaoxiao Sun, Duo Li, Tao Wang, Renchun Tao, Shangfeng Liu, Zhaoying Chen, Weikun Ge, Bo Shen, Xinqiang Wang
Summary: This study demonstrates the room temperature triggered single photon emission from self-assembled GaN quantum dots embedded in AlN nanowires grown on Si (111) substrate. The GaN/AlN QDs exhibit strong emission in the range of 3.6-4.1 eV at 4.7 K, with a sharp emission width as narrow as 1.6 meV. The fast radiative lifetime and observable antibunching effect up to room temperature confirm the potential of practical quantum information applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jari Leemans, Vladimir Pejovic, Epimitheas Georgitzikis, Matthias Minjauw, Abu Bakar Siddik, Yu-Hao Deng, Yinghuan Kuang, Gunther Roelkens, Christophe Detavernier, Itai Lieberman, Pawel E. Malinowski, David Cheyns, Zeger Hens
Summary: QD photodiodes made from non-restricted In(As,P) QDs demonstrate sensitivity for SWIR light up to 1400 nm, making them promising for applications in QD image sensors.
Article
Nanoscience & Nanotechnology
Lukasz Dusanowski, Dominik Koeck, Christian Schneider, Sven Hoefling
Summary: Scalable quantum photonic technologies require the low-loss integration of many identical single-photon sources with photonic circuitry on a chip. Quantum emitter-based single-photon sources are free of the limitations imposed by parametric down-conversion, but the frequency matching of multiple emitters within a single circuit remains challenging. In this work, a fully monolithic GaAs circuit combining two frequency-matched quantum dot single-photon sources interconnected with a low-loss on-chip beamsplitter via single-mode ridge waveguides is demonstrated. This device enabled a two-photon interference experiment on-chip with a visibility reaching 66%, indicating the potential for increasing the complexity of quantum circuits towards fully scalable integrated quantum technologies.
Article
Nanoscience & Nanotechnology
Abhiroop Chellu, Eero Koivusalo, Marianna Raappana, Sanna Ranta, Ville Polojarvi, Antti Tukiainen, Kimmo Lahtonen, Jesse Saari, Mika Valden, Heli Seppanen, Harri Lipsanen, Mircea Guina, Teemu Hakkarainen
Summary: Several passivation techniques for close-to-surface InAs/GaAs quantum dots were compared for their ability to preserve optical properties. It was found that AlNx passivation method significantly reduces surface recombination velocity and shows long-term stability.
Article
Engineering, Electrical & Electronic
Peihang Li, Peng Yu, Wenhao Wang, Feng Lin, Hongxing Xu, Zhiming Wang
Summary: This study introduces the use of plasmonic nanoantennas and metal hybrid structures to enhance the single-photon emission rate and directional radiation of individual III-V quantum dots, shedding light on their potential as single-mode waveguides.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
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
Chemistry, Multidisciplinary
Maxim Rakhlin, Sergey Sorokin, Dmitrii Kazanov, Irina Sedova, Tatiana Shubina, Sergey Ivanov, Vladimir Mikhailovskii, Alexey Toropov
Summary: This study introduces single photon emitters for the green-yellow spectral range, utilizing a CdSe/ZnSe quantum dot inside a semiconductor tapered nanocolumn acting as a nanoantenna. Despite the presence of multiple optical modes, the nanoantenna efficiently collects and outputs the quantum dot radiation. Arrays of such emitters, fabricated using focused ion beam etching from a II-VI/III-V heterostructure grown via molecular beam epitaxy, demonstrate promising potential for secure free space optical communication lines with an average count rate exceeding 5 MHz and a low second-order correlation function at 220 K.
Article
Nanoscience & Nanotechnology
Pawel Holewa, Aurimas Sakanas, Ugur M. Gur, Pawel Mrowinski, Alexander Huck, Bi-Ying Wang, Anna Musial, Kresten Yvind, Niels Gregersen, Marcin Syperek, Elizaveta Semenova
Summary: In this work, a novel approach for achieving single-photon emission from InAs/InP quantum dots heterogeneously integrated with a Si substrate is reported. By using a simple vertical emitting device with a metallic mirror beneath the quantum dot emitter, high photon extraction efficiencies are obtained. The structures demonstrate high-purity single-photon generation under different excitation modes.
Article
Physics, Multidisciplinary
Bo Li, Yuan Cao, Yu-Huai Li, Wen-Qi Cai, Wei-Yue Liu, Ji-Gang Ren, Sheng-Kai Liao, Hui-Nan Wu, Shuang-Lin Li, Li Li, Nai-Le Liu, Chao-Yang Lu, Juan Yin, Yu-Ao Chen, Cheng-Zhi Peng, Jian-Wei Pan
Summary: Long-distance quantum state transfer is a core element of important quantum protocols, but implementing Bell-state measurement after photon propagation in atmospheric channels is challenging due to atmospheric turbulence. By developing a stable interferometer and utilizing a satellite-borne entangled photon source, proof-of-principle QST was demonstrated at a distance of over 1200 km with an average fidelity of 0.82±0.01.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Rafaela F. S. Penacchio, Celso Fornari, Yori G. Camillo, Philipp Kagerer, Sebastian Buchberger, Martin Kamp, Hendrik Bentmann, Friedrich Reinert, Sergio L. Morelhao
Summary: Van der Waals (vdW) materials play a fundamental role in emerging technologies such as spintronics and quantum information processing. This study describes a statistical modeling method for simulating X-ray diffraction in disordered materials, which is essential for controlling the epitaxial growth of topological insulators with intrinsic magnetic properties.
Article
Crystallography
N. Liu, S. Schreyeck, K. M. Fijalkowski, M. Kamp, K. Brunner, C. Gould, L. W. Molenkamp
Summary: This study successfully grew high-quality MnBi2Te4 films with nearly perfect septuple-layer structure using molecular beam epitaxy on Si(1 1 1). The films exhibit antiferromagnetic order with a Neel temperature of 19 K, a spin-flop transition at a magnetic field of 2.5 T, and a resistivity of 1.6 mΩ·cm.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Physics, Multidisciplinary
Dian Wu, Qi Zhao, Can Wang, Liang Huang, Yang-Fan Jiang, Bing Bai, You Zhou, Xue-Mei Gu, Feng-Ming Liu, Ying-Qiu Mao, Qi-Chao Sun, Ming-Cheng Chen, Jun Zhang, Cheng-Zhi Peng, Xiao-Bo Zhu, Qiang Zhang, Chao-Yang Lu, Jian-Wei Pan
Summary: This paper reports on the closure of the locality and detection loopholes in multiparticle self-testing experiments in both photonic and superconducting systems. Three-party and four-party GHZ states have been certified with high fidelities using device-independent methods.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Liang Huang, Xue-Mei Gu, Yang-Fan Jiang, Dian Wu, Bing Bai, Ming-Cheng Chen, Qi-Chao Sun, Jun Zhang, Sixia Yu, Qiang Zhang, Chao-Yang Lu, Jian-Wei Pan
Summary: Nonlocality is a counterintuitive feature of nature that defies classical intuition. Recent investigations show that our physical world's nonlocality is at least tripartite, meaning that genuine tripartite nonlocal correlations cannot be replicated by any causal theory involving bipartite nonclassical resources and unlimited shared randomness. This study experimentally demonstrates genuine tripartite nonlocality in a network under strict locality constraints, using fair sampling assumption and postselection.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Chao Chen, Xing Ding, Jian Qin, Jizhou Wu, Yu He, Chao-Yang Lu, Li Li, Xiong-Jun Liu, Barry C. Sanders, Jian-Wei Pan
Summary: The dissipationless chiral edge states in spin-orbit coupled anomalous Floquet topological phase exhibit nontrivial topological spin texture on boundaries, which can inspire novel topology-based spintronic phenomena and devices.
PHYSICAL REVIEW LETTERS
(2022)
Review
Physics, Multidisciplinary
Chao-Yang Lu, Yuan Cao, Cheng-Zhi Peng, Jian-Wei Pan
Summary: Quantum theory has been validated in laboratory experiments, but its applicability on large length scales is still uncertain. Using satellites and space-based technologies, quantum experiments can be conducted over long distances and in relativistic regimes, enabling the development of flexible global-scale quantum networks.
REVIEWS OF MODERN PHYSICS
(2022)
Article
Optics
Yang Li, Sheng-Kai Liao, Yuan Cao, Ji-Gang Ren, Wei-Yue Liu, Juan Yin, Qi Shen, Jia Qiang, Liang Zhang, Hai-Lin Yong, Jin Lin, Feng-Zhi Li, Tao Xi, Li Li, Rong Shu, Qiang Zhang, Yu-Ao Chen, Chao-Yang Lu, Nai-Le Liu, Xiang-Bin Wang, Jian-Yu Wang, Cheng-Zhi Peng, Jian-Wei Pan
Summary: This work demonstrates successful QKD based on a compact terminal on Tiangong-2 Space Lab and constructs a space-ground quantum network among four ground stations. The medium-inclination orbit and Sun-synchronous orbit show good complementarity for future quantum constellations.
Article
Multidisciplinary Sciences
Qi Shen, Jian-Yu Guan, Ji-Gang Ren, Ting Zeng, Lei Hou, Min Li, Yuan Cao, Jin-Jian Han, Meng-Zhe Lian, Yan-Wei Chen, Xin-Xin Peng, Shao-Mao Wang, Dan-Yang Zhu, Xi-Ping Shi, Zheng-Guo Wang, Ye Li, Wei-Yue Liu, Ge-Sheng Pan, Yong Wang, Zhao-Hui Li, Jin-Cai Wu, Yan-Yan Zhang, Fa-Xi Chen, Chao-Yang Lu, Sheng-Kai Liao, Juan Yin, Jian-Jun Jia, Cheng-Zhi Peng, Hai-Feng Jiang, Qiang Zhang, Jian-Wei Pan
Summary: Networks of optical clocks are important for navigation, redefining time units, and gravitational tests. However, achieving a global-scale optical network with comparable performance requires the dissemination of time and frequency over a long-distance free-space link with matching instability. Previous attempts at high precision dissemination of time and frequency did not extend beyond dozens of kilometers. In this study, we report successful time-frequency dissemination over a free-space link of 113 km with an offset of 6.3 x 10(-20)+/- 3.4 x 10(-19) and an instability of less than 4 x 10(-19), using key technologies such as high-power frequency combs.
Editorial Material
Multidisciplinary Sciences
Chao-Yang Lu
Summary: Quantum physicist Chao-Yang Lu develops ultra-fast computers by harnessing the unique collisions of photons.
Article
Physics, Multidisciplinary
Dian Wu, Yang-Fan Jiang, Xue-Mei Gu, Liang Huang, Bing Bai, Qi-Chao Sun, Xingjian Zhang, Si-Qiu Gong, Yingqiu Mao, Han-Sen Zhong, Ming-Cheng Chen, Jun Zhang, Qiang Zhang, Chao -Yang Lu, Jian-Wei Pan
Summary: Quantum mechanics is often described using complex numbers, but the debate about whether complex numbers are truly necessary has been ongoing. In a recent experiment, a Bell-like test was conducted under strict conditions, and the results violated the constraints of real-valued quantum mechanics, proving the essential role of complex numbers.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Bing Liu, Tim Wagner, Stefan Enzner, Philipp Eck, Martin Kamp, Giorgio Sangiovanni, Ralph Claessen
Summary: By synthesizing ultrathin Sb films on semi-insulating InSb(111)A substrate, researchers observe a pronounced moire pattern on the Sb films and confirm experimentally that the topological surface state persists and shifts toward lower binding energies with a decrease in Sb thickness, in agreement with theoretical predictions.
Article
Physics, Multidisciplinary
Jian Qin, Yu-Hao Deng, Han-Sen Zhong, Li-Chao Peng, Hao Su, Yi-Han Luo, Jia-Min Xu, Dian Wu, Si-Qiu Gong, Hua-Liang Liu, Hui Wang, Ming-Cheng Chen, Li Li, Nai-Le Liu, Chao-Yang Lu, Jian-Wei Pan
Summary: Quantum metrology aims to enhance measurement sensitivity by utilizing quantum resources. We propose and realize a novel quantum metrology scheme that combines unconventional nonlinear interferometers and stimulated emission of squeezed light. Our method achieves a scalable, unconditional, and robust quantum metrological advantage, outperforming ideal 5-N00N states. The demonstrated enhancement in Fisher information per photon, without discounting for imperfections or photon loss, makes our approach applicable in practical quantum metrology at low photon flux regime.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Xiang You, Ming-Yang Zheng, Si Chen, Run-Ze Liu, Jian Qin, Mo-Chi Xu, Zheng-Xuan Ge, Tung-Hsun Chung, Yu-Kun Qiao, Yang-Fan Jiang, Han-Sen Zhong, Ming-Cheng Chen, Hui Wang, Yu-Ming He, Xiu-Ping Xie, Hao Li, Li-Xing You, Christian Schneider, Juan Yin, Teng-Yun Chen, Mohamed Benyoucef, Yong-Heng Huo, Sven Hoefling, Qiang Zhang, Chao-Yang Lu, Jian-Wei Pan
Summary: This study reports quantum interference between two single photons from independent semiconductor quantum dots (QDs) separated by a 302 km optical fiber, representing a key step towards long-distance solid-state quantum networks.
ADVANCED PHOTONICS
(2022)
Article
Materials Science, Multidisciplinary
S. Grisard, H. Rose, A. V. Trifonov, R. Reichhardt, D. E. Reiter, M. Reichelt, C. Schneider, M. Kamp, S. Hofling, M. Bayer, T. Meier, I. A. Akimov
Summary: We study Rabi rotations in intensity-dependent photon echoes from a group of self-assembled InGaAs quantum dots. By using flattop intensity profiles of picosecond laser pulses, we are able to achieve a uniform distribution of intensities within the excited group and overcome the damping effect caused by the spatial inhomogeneity of Rabi frequencies from a Gaussian laser profile. Through photon echo polarimetry, we differentiate the coherent optical responses from exciton and trion groups. We find that the charging of the quantum dots under resonant excitation with intensive optical pulses leads to a significant reduction in the number of neutral quantum dots, while the trion group exhibits robust Rabi rotations with increased refocussing pulse areas. The remaining attenuation of Rabi rotations is analyzed through theoretical modeling, considering excitation-induced dephasing, dipole moment inhomogeneity, and coupling to acoustic phonons, revealing the dominant mechanism of optical coherence loss during the action of the involved optical pulses.
