Article
Multidisciplinary Sciences
M. Hays, V Fatemi, D. Bouman, J. Cerrillo, S. Diamond, K. Serniak, T. Connolly, P. Krogstrup, J. Nygard, A. Levy Yeyati, A. Geresdi, M. H. Devoret
Summary: Researchers combined the advantages of semiconductor spin qubits and superconducting electrodynamic qubits to create the Andreev spin qubit, achieving coherent spin manipulation and discovering spin-flip time and spin coherence time.
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
J. Yoneda, W. Huang, M. Feng, C. H. Yang, K. W. Chan, T. Tanttu, W. Gilbert, R. C. C. Leon, F. E. Hudson, K. M. Itoh, A. Morello, S. D. Bartlett, A. Laucht, A. Saraiva, A. S. Dzurak
Summary: The article demonstrates high-fidelity coherent transport of an electron spin qubit between quantum dots in isotopically-enriched silicon, with a reported polarization transfer fidelity of 99.97% and an average coherent transfer fidelity of 99.4%. The results suggest that this method can reduce the cost of fault-tolerant quantum processors and provide key elements for high-fidelity, on-chip quantum information distribution.
NATURE COMMUNICATIONS
(2021)
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
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
Nanoscience & Nanotechnology
Leon Zaporski, Noah Shofer, Jonathan H. Bodey, Santanu Manna, George Gillard, Martin Hayhurst Appel, Christian Schimpf, Saimon Filipe Covre da Silva, John Jarman, Geoffroy Delamare, Gunhee Park, Urs Haeusler, Evgeny A. Chekhovich, Armando Rastelli, Dorian A. Gangloff, Mete Atature, Claire Le Gall
Summary: Combining highly coherent spin control with efficient light-matter coupling, this study demonstrates the ability to decouple electron spin qubits in optically active semiconductor quantum dots beyond 0.113(3) ms, overcoming the limitations imposed by nuclear inhomogeneity. The findings show a promising solution to the material science challenge and establish the basis for highly coherent spin-photon interfaces.
NATURE NANOTECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Martin Hayhurst Appel, Alexey Tiranov, Alisa Javadi, Matthias C. Lobl, Ying Wang, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton, Peter Lodahl
Summary: Solid-state quantum dots show promise as efficient light-matter interfaces connecting internal spin degrees of freedom to emitted photon states. However, selection rules currently prevent the combination of efficient spin control and optical cyclicity in this platform. By utilizing a photonic crystal waveguide, researchers have experimentally demonstrated optical cyclicity while achieving high fidelity spin initialization and coherent optical spin control, paving the way for scalable multiphoton entanglement generation and on-chip spin-photon gates.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
A. Aarab, R. Azouit, V Reiher, Y. Berube-Lauziere
Summary: A measurement-based quantum feedback protocol is developed for spin-state initialization in a gate-defined double quantum dot spin qubit coupled to a superconducting cavity. The protocol improves qubit state initialization by enabling robust preparation of the spin in shorter time and achieving higher fidelity. Additionally, it is effective at high temperatures.
Article
Multidisciplinary Sciences
Runyu Lu, Kaipeng Liu, Yue Ban
Summary: This paper focuses on the robust control of a singlet-triplet qubit in a nanowire double quantum dot using inverse engineering and shortcuts to adiabaticity (STA). The optimization of STA with respect to systematic errors and the application of optimal control techniques are explored.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Physics, Multidisciplinary
Helin Zhang, Srivatsan Chakram, Tanay Roy, Nathan Earnest, Yao Lu, Ziwen Huang, Jens Koch, David Schuster, D. K. Weiss
Summary: The heavy-fluxonium circuit shows promise as a building block for superconducting quantum processors due to its long relaxation and dephasing time at the flux-frustration point. New protocols have been developed for reset, fast coherent control, and readout to enable high-quality operation of the qubit with 14 MHz transition frequency, significantly lower than the ambient thermal energy scale. By utilizing higher levels of the fluxonium and nonadiabatic Landau-Zener transitions, fast and high-fidelity single-qubit gates have been achieved with measurements of qubit coherence and average gate fidelity.
Article
Physics, Multidisciplinary
Marta Pita-Vidal, Arno Bargerbos, Rok Zitko, Lukas J. Splitthoff, Lukas Grunhaupt, Jaap J. Wesdorp, Yu Liu, Leo P. Kouwenhoven, Ramon Aguado, Bernard van Heck, Angela Kou, Christian Kraglund Andersen
Summary: Spin qubits in semiconductors are a promising platform for scalable quantum computing devices, but achieving multiqubit interactions over extended distances is challenging. Superconducting spin qubits encoded in Andreev levels provide an alternative with intrinsic spin-supercurrent coupling. This study demonstrates an electrostatically defined quantum dot Josephson junction with a spin-split doublet ground state, allowing for qubit manipulation and investigating the qubit performance using direct spin manipulation. Coupling the Andreev spin qubit with a superconducting transmon qubit shows strong coherent qubit-qubit coupling, a crucial step towards a hybrid architecture combining the advantages of both superconducting and semiconductor qubits.
Article
Physics, Multidisciplinary
Maximilian Zanner, Tuure Orell, Christian M. F. Schneider, Romain Albert, Stefan Oleschko, Mathieu L. Juan, Matti Silveri, Gerhard Kirchmair
Summary: Dark-state qubits in a superconducting waveguide exhibit long-range collective interactions and resistance to decoherence, resulting in significantly longer lifetimes than single qubits. These properties make them valuable resources for implementing quantum information protocols.
Article
Multidisciplinary Sciences
Lukas Fricke, Samuel J. Hile, Ludwik Kranz, Yousun Chung, Yu He, Prasanna Pakkiam, Matthew G. House, Joris G. Keizer, Michelle Y. Simmons
Summary: Donor spins in silicon offer a promising material platform for large-scale quantum computing, with excellent electron spin coherence properties demonstrated for isolated phosphorus donors in isotopically pure Si-28. However, the statistical nature of dopant implant and placement processes pose challenges for realizing two-qubit exchange gates using this technique.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Condensed Matter
Ruijiang Liu, Qingrui Dong
Summary: This study investigates the energy spectra of a triangular graphene quantum dot to propose a magnetically controllable spin qubit based on carbon materials. The spin-phase diagrams demonstrate the evolution of spin with changes in external magnetic and electric fields. The study also presents control models for spin switches, providing potential ways to manipulate spin qubits.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Multidisciplinary
Harjot Singh, Demitry Farfurnik, Zhouchen Luo, Allan S. Bracker, Samuel G. Carter, Edo Waks
Summary: This study demonstrates the coupling of an InAs/GaAs quantum dot to a fabricated bullseye cavity with a high cooperativity, providing nearly degenerate and Gaussian polarization modes for efficient optical accessing. The researchers observed extremely short spontaneous emission lifetimes of the quantum dot and approximately 80% transparency of light reflected from the cavity. Utilizing induced transparency for photon switching and coherent control of the quantum dot spin could contribute to the establishment of quantum networks.
Article
Physics, Applied
Sangmin Ji, Takeyoshi Tajiri, Xiao-Fei Liu, Haruki Kiyama, Akira Oiwa, Julian Ritzmann, Arne Ludwig, Andreas D. Wieck, Satoshi Iwamoto
Summary: This study successfully fabricates air-bridge bull's-eye cavities with metal electrodes and demonstrates the nearly polarization-independent optical absorption of a GaAs QW embedded in the cavities. This work marks an important step toward realizing an efficient photon-spin interface using gate-defined QDs.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Leon Zaporski, Noah Shofer, Jonathan H. Bodey, Santanu Manna, George Gillard, Martin Hayhurst Appel, Christian Schimpf, Saimon Filipe Covre da Silva, John Jarman, Geoffroy Delamare, Gunhee Park, Urs Haeusler, Evgeny A. Chekhovich, Armando Rastelli, Dorian A. Gangloff, Mete Atature, Claire Le Gall
Summary: Combining highly coherent spin control with efficient light-matter coupling, this study demonstrates the ability to decouple electron spin qubits in optically active semiconductor quantum dots beyond 0.113(3) ms, overcoming the limitations imposed by nuclear inhomogeneity. The findings show a promising solution to the material science challenge and establish the basis for highly coherent spin-photon interfaces.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Alexey Tiranov, Vasiliki Angelopoulou, Bjorn Schrinski, Cornelis Jacobus van Diepen, Oliver August Dall Alba Sandberg, Ying Wang, Leonardo Midolo, Sven Scholz, Andreas Dirk Wieck, Arne Ludwig, Anders Sondberg Sorensen, Peter Lodahl
Summary: Photon emission is fundamental for light-matter interaction and photonic quantum science. This study demonstrates distant dipole-dipole radiative coupling in solid-state optical quantum emitters embedded in a nanophotonic waveguide. The collective response and emission dynamics can be controlled by proper excitation techniques. This work is a foundational step towards multiemitter applications for scalable quantum-information processing.
Article
Nanoscience & Nanotechnology
Junliang Wang, Hermann Edlbauer, Aymeric Richard, Shunsuke Ota, Wanki Park, Jeongmin Shim, Arne Ludwig, Andreas D. Wieck, Heung-Sun Sim, Matias Urdampilleta, Tristan Meunier, Tetsuo Kodera, Nobu-Hisa Kaneko, Hermann Sellier, Xavier Waintal, Shintaro Takada, Christopher Bauerle
Summary: This research reports the observation of single-photon partitioning during the synchronous shuttling process of a pair of single electrons through a surface acoustic wave, demonstrating the repulsion predominantly caused by Coulomb interaction. This experiment marks an important milestone in realizing controlled-phase gates for in-flight quantum manipulations.
NATURE NANOTECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Natasha Tomm, Sahand Mahmoodian, Nadia O. Antoniadis, Ruediger Schott, Sascha R. Valentin, Andreas D. Wieck, Arne Ludwig, Alisa Javadi, Richard J. Warburton
Summary: The interaction between photons and a single two-level atom is a fundamental concept in quantum physics, revealing nonlinearity and the emergence of photon bound states. The observation of a photon-number-dependent time delay in the scattering off a single artificial atom confirms the existence of stimulated emission and demonstrates the dependence of scattering dynamics on the number of photons involved in the light-matter interaction.
Article
Multidisciplinary Sciences
Patrik I. Sund, Emma Lomonte, Stefano Paesani, Ying Wang, Jacques Carolan, Nikolai Bart, Andreas D. Wieck, Arne Ludwig, Leonardo Midolo, Wolfram H. P. Pernice, Peter Lodahl, Francesco Lenzini
Summary: Scalable photonic quantum computing requires low-loss high-speed reconfigurable circuits and near-deterministic resource state generators. In this study, we developed an integrated photonic platform based on thin-film lithium niobate and combined it with deterministic solid-state single-photon sources based on quantum dots in nanophotonic waveguides. The generated photons were processed using low-loss circuits programmable at speeds of several gigahertz, enabling various key photonic quantum information processing functionalities. This approach shows promise for scalable photonic quantum technologies by merging integrated photonics with solid-state deterministic photon sources.
Article
Quantum Science & Technology
Martin Nurizzo, Baptiste Jadot, Pierre-Andre Mortemousque, Vivien Thiney, Emmanuel Chanrion, David Niegemann, Matthieu Dartiailh, Arne Ludwig, Andreas D. Wieck, Christopher Baeuerle, Matias Urdampilleta, Tristan Meunier
Summary: We propose a protocol to achieve complete spin state readout of a two-electron system in a double quantum dot probed by an electrometer. This is done through repetitive single-shot measurements using Pauli spin blockade and our ability to tune the detuning and interdot tunnel coupling on fast timescales. By performing three distinct manipulations and measurements, we can determine if the spins are in the S, T0, T+, or T- state. This work addresses an important challenge of reducing the overhead for spin readout in scaling up spin-qubit platforms.
Article
Physics, Applied
H. Mannel, J. Kerski, P. Lochner, M. Zoellner, A. D. Wieck, A. Ludwig, A. Lorke, M. Geller
Summary: In this study, the electron spin and trion dynamics in a single self-assembled quantum dot were investigated using time-resolved resonance fluorescence. It was found that the combination of Auger recombination and electron tunneling can flip the electron spin, which limits the spin lifetime.
JOURNAL OF APPLIED PHYSICS
(2023)
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
Physics, Multidisciplinary
Alisa Javadi, Natasha Tomm, Nadia O. Antoniadis, Alistair J. Brash, Rudiger Schott, Sascha R. Valentin, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton
Summary: This study investigates a scheme in which a single emitter, a semiconductor quantum dot, is embedded in a microcavity to generate single photons. By exploiting the splitting of the cavity mode, one for excitation and the other for collection, the best population inversion is achieved with a detuned laser pulse. The Rabi oscillations exhibit an unusual dependence on pulse power, attributed to the non-trivial effect of phonons on the exciton dynamics.
NEW JOURNAL OF PHYSICS
(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)
