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
Multidisciplinary Sciences
Yeonghun Lee, Yaoqiao Hu, Xiuyao Lang, Dongwook Kim, Kejun Li, Yuan Ping, Kai-Mei C. Fu, Kyeongjae Cho
Summary: Solid state quantum defects are promising candidates for scalable quantum information systems and can be seamlessly integrated with conventional semiconductor electronic devices. A promising defect family for spin qubit realization has been discovered in 2D semiconductors.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Duan-Cheng Liu, Pei-Yun Li, Tian -Xiang Zhu, Liang Zheng, Jian-Yin Huang, Zong-Quan Zhou, Chuan-Feng Li, Guang-Can Guo
Summary: This study demonstrates the storage and on-demand retrieval of quantum memories at telecom wavelengths, which is crucial for the establishment of large-scale quantum networks based on fiber networks. The designed storage device features high reliability and scalability, and can be directly integrated into fiber networks.
PHYSICAL REVIEW LETTERS
(2022)
Review
Nanoscience & Nanotechnology
Ying Yu, Shunfa Liu, Chang-Min Lee, Peter Michler, Stephan Reitzenstein, Kartik Srinivasan, Edo Waks, Jin Liu
Summary: This review article presents the physics and technological developments of epitaxial quantum dot devices emitting in the telecom bands for quantum network devices. The challenges and opportunities for future telecom quantum dot devices with improved performance and expanded functionality through hybrid integration are also discussed.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Aaron J. Weinstein, Matthew D. Reed, Aaron M. Jones, Reed W. Andrews, David Barnes, Jacob Z. Blumoff, Larken E. Euliss, Kevin Eng, Bryan H. Fong, Sieu D. Ha, Daniel R. Hulbert, Clayton A. C. Jackson, Michael Jura, Tyler E. Keating, Joseph Kerckhoff, Andrey A. Kiselev, Justine Matten, Golam Sabbir, Aaron Smith, Jeffrey Wright, Matthew T. Rakher, Thaddeus D. Ladd, Matthew G. Borselli
Summary: This study demonstrates an alternative approach to quantum computation that uses energy-degenerate encoded qubit states controlled by nearest-neighbour contact interactions, bypassing microwave-associated correlated errors. The combination of enriched silicon, all-electrical partial swap operations, and configurable encoding offers a strong pathway towards scalable fault tolerance and computational advantage.
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, Multidisciplinary
Martin Hayhurst Appel, Alexey Tiranov, Simon Pabst, Ming Lai Chan, Christian Starup, Ying Wang, Leonardo Midolo, Konstantin Tiurev, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Anders Sondberg Sorensen, Peter Lodahl
Summary: This Letter demonstrates a scalable source of time-bin encoded Greenberger-Horne-Zeilinger and linear cluster states from a solid-state quantum dot embedded in a nanophotonic crystal waveguide. A self-stabilizing double-pass interferometer is utilized to measure a spin-photon Bell state with high fidelity. The strict resonant excitation enables high photon indistinguishability, conducive to scaling up the technology and producing more general graph states.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Suparna Seshadri, Hsuan-Hao Lu, Daniel E. Leaird, Andrew M. Weiner, Joseph M. Lukens
Summary: In this study, we successfully generated all four frequency-bin Bell states in a single versatile setup using successive pumping. Our scheme controls the pump configuration through intensity modulation and can generate any desired Bell state using off-the-shelf telecommunication equipment. We reconstructed the density matrices of the generated Bell states using Bayesian inference and achieved fidelities >= 97% for all cases. Additionally, we demonstrated the sensitivity of the frequency-bin Bell states to temporal delays, presenting the potential for enhanced resolution or nonlocal sensing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Jin-Woo Chae, Jin-Hun Kim, Youn-Chang Jeong, Yoon-Ho Kim
Summary: In this work, a tunable up-conversion single-photon detector module that covers the complete telecom C band is reported, making it suitable for quantum communication networks based on sharing wavelength-multiplexed entangled photons.
Article
Physics, Multidisciplinary
Prasoon K. Shandilya, David P. Lake, Matthew J. Mitchell, Denis D. Sukachev, Paul E. Barclay
Summary: The article presents a new method based on cavity optomechanics that utilizes the susceptibility of spin qubits to control electronic spins of nitrogen vacancy centres in diamond. This method does not involve qubit optical transitions and can be applied to solid-state qubits in a wide variety of materials, expanding the toolbox for quantum information processing.
Article
Optics
Pawel Podemski, Michal Gawelczyk, Pawel Wyborski, Hanna Salamon, Marek Burakowski, Anna Musial, Johann Peter Reithmaier, Mohamed Benyoucef, Grzegorz Sek
Summary: Single InP-based quantum dots emitting in the third telecom window are probed quasi-resonantly in polarization-resolved microphotoluminescence experiments. Negative circular polarization, observed in charged quantum dots, is a fingerprint of the optical spin writing of the carriers within the quantum dots. The investigated quantum dots have a very dense ladder of excited states, providing relatively easy quasi-resonant optical excitation and bringing quantum gates and memories closer to compatibility with fiber-optic communication.
Article
Physics, Multidisciplinary
Travers Ward, Matthias Keller
Summary: This study investigates two single-photon generation schemes and compares their suitability for time-bin entanglement encoding. By manipulating the phase relationship between time-bins of successive photons and carefully selecting the initial state, detrimental effects of spontaneous emission can be significantly reduced, making time-bin entanglement encoding feasible.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Ming Lai Chan, Ziv Aqua, Alexey Tiranov, Barak Dayan, Peter Lodahl, Anders S. Sorensen
Summary: We propose a deterministic and fully passive scheme to transfer the quantum state of a frequency-encoded photon to the spin of a quantum dot via a nanophotonic waveguide. By studying the effects of all relevant experimental imperfections on the state transfer fidelity, we demonstrate that a transfer fidelity exceeding 95% can be achieved for experimentally realistic parameters. Our work paves the way for deterministic solid-state quantum networks tailored to frequency-encoded photonic qubits.
Article
Chemistry, Multidisciplinary
Chang-Min Lee, Mustafa Atabey Buyukkaya, Samuel Harper, Shahriar Aghaeimeibodi, Christopher J. K. Richardson, Edo Waks
Summary: In this study, a bright telecom-wavelength single photon source is demonstrated based on a tapered nanobeam containing InAs/InP quantum dots. The tapered nanobeam enables directional and Gaussian-like far-field emission of the quantum dots, resulting in a high-end brightness. Adopting quasi-resonant excitation helps reduce multiphoton emission and decoherence, achieving a coherence time and postselected Hong-Ou-Mandel visibility suitable for long-distance quantum networks.
Article
Physics, Condensed Matter
Amin Rassekh, Majid Shalchian, Jean-Michel Sallese, Farzan Jazaeri
Summary: This paper investigates the implementation of solid-state qubits using electrostatically confined quantum dots in semiconductors, with independent control over the electrochemical potentials of each quantum dot. The reliability and scalability of quantum dots are highlighted. The paper presents a proposed approach based on the Generalized Hubbard model and Fermi's Golden rule to extensively study the charge stability diagram of a double quantum dots system. Experimental data confirms the validity of the approach. Temperature effects, spin-exchange, pair-hopping, and occupation-modulated hopping parameters are discussed, along with the incorporation of Zeeman energies in the Hubbard model to study spin splitting caused by an external magnetic field. The aim of this paper is to utilize fundamental physical concepts to model and optimize singlet-triplet qubits in quantum dots, considering intrinsic and extrinsic parameters. This provides insight into the design rules for efficient coupling, measurement, initialization, manipulation, and readout of qubit states.
PHYSICA B-CONDENSED MATTER
(2023)
Editorial Material
Physics, Applied
Christoph Becher, Sven Hoefling, Jin Liu, Peter Michler, Wolfram Pernice, Costanza Toninelli
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Josephine Nauschuetz, Hedwig Knoetig, Robert Weih, Julian Scheuermann, Johannes Koeth, Sven Hoefling, Benedikt Schwarz
Summary: This article presents GaSb-based interband cascade lasers (ICLs) operating at a center wavelength of 6.12 μm in continuous-wave mode up to a maximum temperature of 40 °C. The performance of the devices is improved by adjusting the Ga1-xInxSb layer thickness in the active region to reduce valence intersubband absorption. The optimization of the device design and electron injector rebalances the electron and hole concentrations, resulting in low threshold current densities and power consumption, making them suitable for mobile and compact sensing systems.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Jonathan Jurkat, Sebastian Klembt, Marco De Gregorio, Moritz Meinecke, Quirin Buchinger, Tristan H. Harder, Johannes Beierlein, Oleg A. Egorov, Monika Emmerling, Constantin Krause, Christian Schneider, Tobias Huber-Loyola, Sven Hoefling
Summary: The introduction of topological physics to photonics has resulted in the development of robust photonic devices. While classical topological protection of light has been achieved, the utilization of quantum light sources in devices with topologically nontrivial resonances remains largely unexplored.
Article
Engineering, Electrical & Electronic
Nikolai B. Chichkov, Amit Yadav, Franck Joulain, Solenn Cozic, Semyon V. Smirnov, Leon Shterengas, Julian Scheuermann, Robert Weih, Johannes Koeth, Sven Hofling, Ulf Hinze, Samuel Poulain, Edik U. Rafailov
Summary: Building upon recent advances in GaSb-based diode lasers and Er-doped fluoride fibre technologies, this article demonstrates the fibre-based amplification of mid infrared diode lasers around 2.78 μm for the first time. The experimental results show output powers up to 0.9 W, pulse durations as short as 20 ns, and pulse repetition rates up to 1 MHz. Additionally, the impact of different fibre end-cap materials on laser performance is analyzed.
IEEE PHOTONICS JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Michael D. Fraser, H. Hoe Tan, Yago del Valle Inclan Redondo, Hima Kavuri, Elena A. Ostrovskaya, Christian Schneider, Sven Hoefling, Yoshihisa Yamamoto, Seigo Tarucha
Summary: The use of high energy proton implantation allows for precise and independent manipulation of both exciton and photon energies in GaAs microcavity exciton-polaritons. This technique involves post-growth proton implantation and annealing steps to induce small local interdiffusion, resulting in energy shifts in exciton or photon components. The polariton mode can be tuned by more than 10 meV, altering the effective mass for photon and exciton energy shifts, while maintaining narrow-linewidth polariton emission and condensation.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Rafael Luque Merino, Paul Seifert, Jose Duran Retamal, Roop K. Mech, Takashi Taniguchi, Kenji Watanabe, Kazuo Kadowaki, Robert H. Hadfield, Dmitri K. Efetov
Summary: A proof-of-concept nanodetector based on two-dimensional cuprate superconductor Bi2Sr2CaCu2O8-delta has been demonstrated to exhibit single-photon sensitivity at telecom wavelength at a record temperature of 20 K, paving the way for broader application of single-photon technologies.
Article
Optics
Pablo Roldan-Varona, Calum A. A. Ross, Luis Rodriguez-Cobo, Jose Miguel Lopez-Higuera, Erin Gaughan, Kevin Dhaliwal, Michael G. G. Tanner, Robert R. R. Thomson, Helen E. E. Parker
Summary: Imaging fibers are used to perform real-time fluorescence endomicroscopy, in vivo, in situ, with the goal of increasing diagnostic information for a plethora of organ systems and diseases. Widefield fiber endomicroscopy systems are simple, cost-effective, and come with fast image acquisition times. However, alternative approaches such as scanning systems produce higher contrast images with intrinsic optical sectioning, improving the visibility of histological features, albeit at the expense of simplicity, cost, and acquisition rate. We developed a selective plane illumination microscopy endoscopic fiber platform, consisting of an ultrafast laser fabricated end-cap, integrated with a polymer coherent fiber bundle, and an epifluorescence microscope. Polymer fibers are known to fluoresce when pumped with blue light, enhancing the background and noise in images. Our end-cap design circumvents this challenge. We demonstrate a reduction of out-of-focus features, along with improved contrast of in-focus features, in images of a tissue phantom. Moreover, we demonstrate the utility of our platform for endomicroscopy using a whole, ex vivo human lung model.
Article
Physics, Applied
Quirin Buchinger, Simon Betzold, Sven Hoefling, Tobias Huber-Loyola
Summary: We conducted an optical study on various device designs of electrically contactable circular Bragg grating cavities in labyrinth geometries. In order to establish an electrical connection between the central disk and the surrounding membrane, we introduced connections between the adjacent rings separated by air gaps. By rotating these connections to create a labyrinth-like structure, we improved mode confinement, far-field pattern, and Purcell factor compared to layouts with connections arranged in straight lines. Reflectivity measurements and simulations were conducted to investigate the effects of different arrangements and sizes of connections on the optical properties and to determine the optimal design.
APPLIED PHYSICS LETTERS
(2023)
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
Chemistry, Multidisciplinary
Yago del Valle-Inclan Redondo, Christian Schneider, Sebastian Klembt, Sven Hoefling, Seigo Tarucha, Michael D. Fraser
Summary: We have created a rotating polariton condensate at gigahertz frequencies by off-resonantly pumping with a rotating optical stirrer composed of structured laser modes. The results show that the rotating polariton condensate acquires angular momentum exceeding the critical 1n/particle and demonstrates deterministic nucleation and capture of quantized vortices with a handedness controlled by the pump rotation direction. This study enables new opportunities for exploring open dissipative superfluidity, ordering of non-Hermitian quantized vortex matter, and topological states in a highly nonlinear, photonic platform.
Article
Optics
Andrew B. Matheson, Ahmet T. Erdogan, Charlotte Hopkinson, Sam Borrowman, Gary J. Loake, Michael G. Tanner, Robert K. Henderson
Summary: A handheld Fluorescent Lifetime Imaging (FLIM) system is demonstrated in this work, which is based on a distally mounted < 2 mm2 128 x 120 single photon avalanche diode (SPAD) array and operates over a > 1 m long wired interface. It is the first example of a SPAD array mounted on the distal end of a handheld FLIM system. The system has potential applications in biology and biomedicine, and can provide contrast between different tissue compositions and stress/damage levels.
Article
Physics, Multidisciplinary
Carolin Lueders, Matthias Pukrop, Franziska Barkhausen, Elena Rozas, Christian Schneider, Sven Hoefling, Jan Sperling, Stefan Schumacher, Marc Assmann
Summary: We have developed a novel phase-space method to dynamically monitor quantum coherence in polariton condensates. Our approach allows us to quantify complex decoherence mechanisms and provides a stable system for long-term coherence. By reconstructing phase-space functions from homodyne detection data, we have demonstrated the potential of using quantum coherence for information processing up to the nanosecond regime.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Silke A. Peeters, Ciaran T. Lennon, Marc J. M. Merkx, Robert H. Hadfield, W. M. M. (Erwin) Kessels, Marcel A. Verheijen, Harm C. M. Knoops
Summary: This work demonstrates that ultrathin superconducting TaCxN1-x films can be prepared using plasma-enhanced atomic layer deposition (PEALD) with substrate biasing. The ion-energy control enables tuning of the composition, improves film quality, and shows clear dependence of the critical temperature of superconductivity on ion energy.
APPLIED PHYSICS LETTERS
(2023)
Review
Optics
Robert h. Hadfield, Jonathan Leach, Fiona Fleming, Douglas j. Paul, Chee hing Tan, Jo shien Ng, Robert k. Henderson, Gerald s. Buller
Summary: The development of single-photon detectors with picosecond timing resolution has driven progress in time-correlated single-photon counting applications, including quantum optics, life sciences, and remote sensing. Advanced optoelectronic device architectures offer high-performance single-pixel devices and the ability to scale up to detector arrays, increasing single-photon sensitivity.
Proceedings Paper
Engineering, Biomedical
M. G. Tanner
Summary: Single photon detection offers enhanced measurement capabilities through observation of timing dynamics. Recent advancements in CMOS single photon avalanche diodes enable practical applications in various fields. This study describes efforts to enhance technologies such as fiber optic spectroscopy, endoscopic imaging, and widefield clinical imaging using this technology. Multiple applications have been demonstrated to improve signal to noise ratio and disambiguate fluorescently labeled bacteria.
TRANSLATIONAL BIOPHOTONICS: DIAGNOSTICS AND THERAPEUTICS III
(2023)
