Article
Multidisciplinary Sciences
Ke Wang, Gang Xu, Fei Gao, He Liu, Rong-Long Ma, Xin Zhang, Zhanning Wang, Gang Cao, Ting Wang, Jian-Jun Zhang, Dimitrie Culcer, Xuedong Hu, Hong-Wen Jiang, Hai-Ou Li, Guang-Can Guo, Guo-Ping Guo
Summary: Hole-spin qubits in germanium show promise for rapid, all-electrical qubit control. The authors demonstrate ultrafast single-spin manipulation in a hole-based double quantum dot in a germanium hut wire, with a record Rabi frequency exceeding 540 MHz. These results suggest the potential for ultrafast coherent control of hole spin qubits to meet the requirements for scalable quantum information processing.
NATURE COMMUNICATIONS
(2022)
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
Multidisciplinary Sciences
Lukasz Dusanowski, Cornelius Nawrath, Simone L. Portalupi, Michael Jetter, Tobias Huber, Sebastian Klembt, Peter Michler, Sven Hoefling
Summary: This study demonstrates a solid-state spin-qubit platform based on a hole confined in a semiconductor quantum dot that emits telecom-band photons. The researchers showcase the control and manipulation of the hole, enabling its use in long-distance quantum communication. This work is significant for the development of solid-state quantum emitters compatible with existing optical fiber networks.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Philip Willke, Tobias Bilgeri, Xue Zhang, Yu Wang, Christoph Wolf, Herve Aubin, Andreas Heinrich, Taeyoung Choi
Summary: Control of single electron spins is promising for spintronics. Using single molecular magnets as hosts allows for coherent spin manipulation and individual addressable molecular spins in self-assemblies.
Article
Optics
Thibaut Renaud, Heming Huang, Frederic Grillot, Dieter Bimberg
Summary: The nonlinear features of semiconductor optical amplifiers (SOAs) and semiconductor lasers made from InAs/GaAs quantum dot (QD) wafers were investigated, showing notably different wave conversion processes due to ultrafast sub-picosecond mechanisms. The SOAs benefit more from sub-picosecond carrier dynamics, exhibiting higher conversion efficiency (CE) in the THz range compared to laser diodes.
LASER PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Wenbo Zhan, Jinkwan Kwoen, Takaya Imoto, Satoshi Iwamoto, Yasuhiko Arakawa
Summary: The trilayer quantum dot structure has successfully extended the emission wavelength to 1370 nm without the need for metamorphic buffer layers, demonstrating great potential for high-performance QD lasers on GaAs substrate.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Optics
Nikita Yu Gordeev, Marina M. Kulagina, Yuliya A. Guseva, Artem A. Serin, Alexey S. Payusov, Grigorij O. Kornyshov, Fedor Zubov, Alexey E. Zhukov, Mikhail Maximov
Summary: An original design of ring semiconductor lasers based on InAs/InGaAs/GaAs quantum dots has been proposed and tested. The lasers have promising applications in clock pulse generation, optical sensing, biological and medical fields, and microwave photonics. Lasing was achieved at room temperature with a low nominal threshold current density and an output power of 45 mW in continuous wave mode.
LASER PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
N. Piot, B. Brun, V Schmitt, S. Zihlmann, V. P. Michal, A. Apra, J. C. Abadillo-Uriel, X. Jehl, B. Bertrand, H. Niebojewski, L. Hutin, M. Vinet, M. Urdampilleta, T. Meunier, Y-M Niquet, R. Maurand, S. De Franceschi
Summary: This article reports a spin-orbit hole spin qubit, which achieves operation sweet spots by varying the magnetic field direction, reducing charge noise and extending Hahn-echo coherence time, providing new possibilities for the scalability of silicon-based hole spin qubits in quantum information processing.
NATURE NANOTECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Jun-Yong Yan, Chen Chen, Xiao-Dong Zhang, Yu-Tong Wang, Hans-Georg Babin, Andreas D. Wieck, Arne Ludwig, Yun Meng, Xiaolong Hu, Huali Duan, Wenchao Chen, Wei Fang, Moritz Cygorek, Xing Lin, Da-Wei Wang, Chao-Yuan Jin, Feng Liu
Summary: Coherent manipulation of hole-orbital states in semiconductor quantum dots has been achieved through stimulated Auger processes, providing opportunities for developing new types of orbital-based solid-state quantum photonic devices.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Nadia O. Antoniadis, Mark R. Hogg, Willy F. Stehl, Alisa Javadi, Natasha Tomm, Ruediger Schott, Sascha R. Valentin, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton
Summary: To improve the rapid and high-fidelity single-shot readout of quantum states, researchers used an open microcavity to enhance the optical readout signal from a semiconductor quantum dot spin state. They achieved a record readout time of only 3 nanoseconds with a fidelity of (95.2 ± 0.7)%, and observed quantum jumps using repeated single-shot measurements. This work opens up new possibilities for the use of semiconductor quantum dots in quantum technologies.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Wenfu Yu, Xuyi Zhao, Shixian Han, Antian Du, Ruotao Liu, Chunfang Cao, Jinyi Yan, Jin Yang, Hua Huang, Hailong Wang, Qian Gong
Summary: We report the operation of InAs/GaAs quantum dot laterally coupled distributed feedback (LC-DFB) lasers at room temperature in the wavelength range of 1.31 μm. Stable continuous-wave single-frequency operation with high output power and excellent side mode suppression ratio was achieved. Furthermore, a single chip integrating three LC-DFB lasers was explored, covering a wide wavelength span at room temperature.
CHINESE OPTICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Katrina Barnes, Peter Battaglino, Benjamin J. Bloom, Kayleigh Cassella, Robin Coxe, Nicole Crisosto, Jonathan P. King, Stanimir S. Kondov, Krish Kotru, Stuart C. Larsen, Joseph Lauigan, Brian J. Lester, Mickey McDonald, Eli Megidish, Sandeep Narayanaswami, Ciro Nishiguchi, Remy Notermans, Lucas S. Peng, Albert Ryou, Tsung-Yao Wu, Michael Yarwood
Summary: This study introduces a qubit encoded in the nuclear spin states of a single Sr-87 atom and demonstrates long coherence time in a register of individually-controlled qubits. The researchers achieve comparable coherence times while driving multiple qubits in parallel. They suggest that nuclear spin qubits will combine with technical advances to accelerate the realization of intermediate-scale quantum information processors.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Quanbo Jiang, Prithu Roy, Jean-Benoit Claude, Jerome Wenger
Summary: In this research, plasmonic nanoantennas were used to trap single colloidal quantum dots and enhance their photoluminescence without the need for further processing, achieving precise positioning of the quantum emitter at the nanoantenna hotspot. The dedicated nanoantenna design exhibited high trap stiffness for quantum dot trapping and relatively low trapping power, resulting in significantly improved emission characteristics of the single quantum dot.
Article
Physics, Condensed Matter
Hamsavahini Rajanna, Kaustab Ghosh
Summary: Theoretical model presented in the paper illustrates the dynamics of electron capture and emission in InAs/GaAs quantum dot (QD) photodetector, as well as describes the bandstructure-dependent dark current generation. The study predicts the possibility of excessive dark current based on rates of thermal and phonon assisted tunneling emissions from quantized energy states. Findings suggest that by altering QD size, it is possible to significantly reduce high dark current generated at specific temperature and bias voltage, proposing an optimum QD size for minimal dark current generation at different temperatures and applied bias.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Maxim Rakhlin, Grigorii Klimko, Sergey Sorokin, Marina Kulagina, Yurii Zadiranov, Dmitrii Kazanov, Tatiana Shubina, Sergey Ivanov, Alexey Toropov
Summary: This paper reports on single-photon emitters designed for the telecommunication O-band. These emitters consist of InAs/(In)GaAs quantum dots with asymmetric barriers placed inside semiconductor tapered nanocolumns acting as photonic nanoantennas. The implemented design allows for a shift in the quantum dot radiation wavelength towards the O-band, and the nanoantennas collect and effectively output the radiation. With non-resonant optical pumping, the average count rate of emitted single photons exceeds 10 MHz, with a second-order correlation function g((2))(0) = 0.18 at 8 K.
Review
Physics, Multidisciplinary
Jorge Puebla, Yunyoung Hwang, Kouta Kondou, Yoshichika Otani
Summary: This paper provides an overview of the progress in spin conversion and discusses the additional consequences beyond efficient spin conversion that arise from the formation of quasiparticles at band crossings.
ANNALEN DER PHYSIK
(2022)
Article
Engineering, Electrical & Electronic
Charlotte Ovenden, Ian Farrer, Maurice S. Skolnick, Jon Heffernan
Summary: Atomic force microscopy (AFM) assisted local anodic oxidation (LAO) is a low contamination method for semiconductor fabrication. In this study, we demonstrate the fabrication of deep and highly reproducible nanohole arrays on InP using LAO. The size and depth of the nanoholes and nano-oxide mounds can be controlled independently by altering AFM tip bias and humidity. The oxidation mechanism of semi-insulating InP during LAO is found to be similar to that of plasma oxidation.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Dominic Hallett, Andrew P. Foster, David Whittaker, Maurice S. Skolnick, Luke R. Wilson
Summary: This study demonstrates numerically that spin-dependent chiral coupling can be achieved by embedding a quantum emitter with circularly polarized optical transitions in a waveguide-coupled nanocavity. The experimentally feasible cavity design supports high chiral contrast, efficient cavity-waveguide coupling, and enhanced light-matter interaction strength.
Article
Physics, Applied
J. Puebla, Y. Hwang, S. Maekawa, Y. Otani
Summary: Surface acoustic waves (SAWs) are elastic waves propagating on the surface of solids with the amplitude decaying into the solid. SAWs can manipulate the magnetization states by magnetostriction and magnetoelastic effects. This review discusses the characteristics of SAW devices and their interaction with the magnetization in thin films.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Feng Li, Yiming Li, L. Giriunas, M. Sich, D. D. Solnyshkov, G. Malpuech, A. A. P. Trichet, J. M. Smith, E. Clarke, M. S. Skolnick, D. N. Krizhanovskii
Summary: In this study, a tunable open-access microcavity was established to achieve polariton condensation by controlling the light-matter coupling strength through nanopositioners. The experimental results showed that the lowest condensation threshold always occurred at a fixed energy trap depth for different coupling strengths.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Kei Yamamoto, Mingran Xu, Jorge Puebla, Yoshichika Otani, Sadamichi Maekawa
Summary: In this paper, a theoretical description of magnon-phonon interactions in multilayer structures containing a ferromagnetic thin film is presented. The formalism takes into account external magnetic fields in arbitrary directions and various types of acoustic waves, including Rayleigh and Love surface modes. By paying attention to the spatial profile of acoustic wave modes and deriving analytical expressions for effective coupling coefficients, the study successfully reproduces a strongly anisotropic and non-reciprocal linewidth observed in recent experiments of acoustic ferromagnetic resonance.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Optics
Tintu Kuriakose, Paul M. Walker, Toby Dowling, Oleksandr Kyriienko, Ivan A. Shelykh, Phillipe St-Jean, Nicola Carlon Zambon, Aristide Lemaitre, Isabelle Sagnes, Luc Legratiet, Abdelmounaim Harouri, Sylvain Ravets, Maurice S. Skolnick, Alberto Amo, Jacqueline Bloch, Dmitry N. Krizhanovskii
Summary: Photonic platforms are ideal for quantum technologies due to weak photon-environment coupling and interactions between photons. This study demonstrates that the required nonlinearity can be achieved using exciton-polaritons in micropillars with embedded quantum wells, and observes the effect of cross-phase modulation.
Article
Optics
T. P. Lyons, D. J. Gillard, C. Leblanc, J. Puebla, D. D. Solnyshkov, L. Klompmaker, I. A. Akimov, C. Louca, P. Muduli, A. Genco, M. Bayer, Y. Otani, G. Malpuech, A. I. Tartakovskii
Summary: In this study, we investigate the relationship between spin polarization of a 2DEG in a monolayer semiconductor and light-matter interactions modified by an optical microcavity. We observe a pronounced spin-susceptibility of the 2DEG, leading to the observation of a giant effective valley Zeeman splitting for trion-polaritons. We also demonstrate effective optical nonlinearity and all-optical tuning of the polaritonic Zeeman splitting. This study lays the groundwork for engineering topological phases with true unidirectionality in monolayer semiconductors.
Article
Multidisciplinary Sciences
Andrew J. Ramsay, Reza Hekmati, Charlie J. Patrickson, Simon Baber, David R. M. Arvidsson-Shukur, Anthony J. Bennett, Isaac J. Luxmoore
Summary: Spin defects in hexagonal boron nitride foils are used for magnetic field imaging. The authors extend the coherence time to 4 microseconds using a strong continuous microwave drive and show full control of a protected qubit.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Iago Diez, Andrey Krysa, Isaac J. Luxmoore
Summary: This paper presents the inverse design of monolithic whispering-gallery nanolasers that can emit laser beams with tailored shape and polarization. Three types of submicron cavities are designed and experimentally verified, each emitting a different laser radiation mode. The measured output laser beams demonstrate the effectiveness of the method in designing ultracompact lasers with tailored beams.
Article
Optics
Anthonin Delphan, Maxim N. Makhonin, Tommi Isoniemi, Paul M. Walker, Maurice S. Skolnick, Dmitry N. Krizhanovskii, Dmitry V. Skryabin, Jean-Francois Carlin, Nicolas Grandjean, Raphael Butte
Summary: We observed polariton lasing in micro-ring resonators based on GaN/AlGaN slab waveguides in the UV spectral range, with stimulated polariton relaxation into multiple ring resonator modes. The strong exciton-photon coupling regime was confirmed by the reduction of the free spectral range and the blueshift of the exciton-like modes with increasing pulse energy. The absence of broadening in the exciton emission further confirmed lasing at low electron-hole densities. Overall, our work paves the way for the development of novel UV devices based on high-speed slab waveguide polariton geometry operating up to room temperature and integrated into complex photonic circuits.
Article
Physics, Applied
J. M. Flores-Camacho, Bivas Rana, R. E. Balderas-Navarro, A. Lastras-Martinez, Yoshichika Otani, Jorge Puebla
Summary: We investigated the optical properties of NM/Co20Fe60B20/MgO heterostructures using mid infrared spectroscopic ellipsometry. We obtained the dielectric function of Co20Fe60B20 for the first time and determined the dielectric tensor properties of a 2DEG at the NM and CoFeB interface. The interfacial properties, 2DEG Drude parameters, and SOC strength were found to depend on the type of NM.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Quantum Science & Technology
Hamidreza Siampour, Christopher O'Rourke, Alistair J. Brash, Maxim N. Makhonin, Rene Dost, Dominic J. Hallett, Edmund Clarke, Pallavi K. Patil, Maurice S. Skolnick, A. Mark Fox
Summary: Quantum states of light and matter can be manipulated on the nanoscale to aid the implementation of scalable photonic quantum technologies. A nanophotonic waveguide platform with embedded quantum dots (QDs) was demonstrated, allowing for Purcell-enhanced emission and strong chiral coupling. Record-large radiative decay rate and Purcell enhancement were achieved through electric-field tuning and quasi-resonant excitation. The results show promising prospects for using QDs in scalable implementations of on-chip spin-photonics relying on chiral quantum optics.
NPJ QUANTUM INFORMATION
(2023)
Article
Physics, Multidisciplinary
Yunyoung Hwang, Jorge Puebla, Kouta Kondou, Carlos Sanchez Munoz, Yoshichika Otani
Summary: We find that the temperature-induced changes in sound velocity of a piezoelectric substrate lead to shifts in the resonant frequencies of surface acoustic wave (SAW) peaks. The previously observed nonlinear power dependence of spin current generated by SAWs is a result of frequency shifts of SAW peaks caused by heating at the interdigital transducers. Additionally, the utilization of an acoustic cavity constructed with acoustic Bragg reflector gratings leads to the emergence of higher-frequency peaks and changes in peak shapes, particularly at high input power.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Nanoscience & Nanotechnology
Shi Guo, Savvas Germanis, Takashi Taniguchi, Kenji Watanabe, Freddie Withers, Isaac J. Luxmoore
Summary: In this work, a device geometry consisting of gold pillars embedded in a van der Waals heterostructure is presented. The gold pillars generate strain and inject charge carriers, enabling positional control and electrical pumping of a single photon emitter. Increasing the thickness of the hexagonal boron nitride tunnel barriers restrict electroluminescence but enable electrical control of the emission energy of the site-controlled single photon emitters, with measured energy shifts reaching 40 meV.
