Article
Multidisciplinary Sciences
Yi-Han Luo, Ming-Cheng Chen, Manuel Erhard, Han-Sen Zhong, Dian Wu, Hao-Yang Tang, Qi Zhao, Xi-Lin Wang, Keisuke Fujii, Li Li, Nai-Le Liu, Kae Nemoto, William J. Munro, Chao-Yang Lu, Anton Zeilinger, Jian-Wei Pan
Summary: Quantum gate teleportation proposes an elegant solution to replace fragile nontransverse inline gates with specific highly entangled offline resource states for implementing nontransverse gates in circuits. By creating maximally entangled states and teleporting quantum information, the scheme can achieve fidelities up to 0.786 and be fully fault tolerant for future large-scale quantum technologies.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Quantum Science & Technology
Federico Fedele, Anasua Chatterjee, Saeed Fallahi, Geoffrey C. Gardner, Michael J. Manfra, Ferdinand Kuemmeth
Summary: Researchers demonstrated a two-by-two array of four singlet-triplet qubits in gallium arsenide, showing simultaneous coherent operations and four-qubit measurements via exchange oscillations and frequency-multiplexed single-shot measurements. A larger multielectron quantum dot is fabricated in the center of the array as a tunable interqubit link, which is utilized to demonstrate coherent spin exchange with selected qubits. These techniques can be extended to other materials, showing a path towards quantum processors with gate-controlled spin qubits.
Review
Chemistry, Multidisciplinary
Arnab Pal, Shuo Zhang, Tanmay Chavan, Kunjesh Agashiwala, Chao-Hui Yeh, Wei Cao, Kaustav Banerjee
Summary: Band theory has contributed significantly to the development of modern integrated solid-state electronics, but the increasing energy consumption and environmental issues require the exploration of more efficient electronic and optoelectronic technologies. The emerging 2D layered materials provide a revolutionary platform and opportunities for quantum-engineered devices with their unique low-dimensional manufacturing capabilities.
ADVANCED MATERIALS
(2023)
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)
Review
Chemistry, Multidisciplinary
Akshay Wali, Saptarshi Das
Summary: The increased demand for high-performance computing systems has highlighted the limitations of the current von Neumann architecture. To address this, developing alternative computing primitives that offer faster processing speed and lower energy consumption is crucial. Recent developments in 2D-memtransistor devices, a new type of multiterminal device, have shown promising potential in overcoming these limitations. This article provides an overview of these devices, their fundamental mechanisms, and their applications in various fields.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Quantum Science & Technology
Alexandre M. Souza
Summary: In this study, dynamical decoupling sequences were tested on a single qubit using the Rigetti quantum computing platform. It was found that pulse imperfections limited the performance, but using robust sequences improved the effectiveness of dynamical decoupling. The tested sequences outperformed previous ones on the same platform.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Quantum Science & Technology
Kaixuan Huang, Zheng-An Wang, Chao Song, Kai Xu, Hekang Li, Zhen Wang, Qiujiang Guo, Zixuan Song, Zhi-Bo Liu, Dongning Zheng, Dong-Ling Deng, H. Wang, Jian-Guo Tian, Heng Fan
Summary: Generative adversarial networks have been successful in machine learning, and their quantum counterparts, known as quantum generative adversarial networks (QGANs), may have exponential advantages. Researchers have implemented a QGAN using a programmable superconducting processor, paving the way for experimental explorations of quantum advantages in practical applications with near-term quantum technologies.
NPJ QUANTUM INFORMATION
(2021)
Article
Chemistry, Multidisciplinary
Rui-Zi Hu, Rong-Long Ma, Ming Ni, Xin Zhang, Yuan Zhou, Ke Wang, Gang Luo, Gang Cao, Zhen-Zhen Kong, Gui-Lei Wang, Hai-Ou Li, Guo-Ping Guo
Summary: This paper introduces how to realize a single spin qubit from Si-MOS quantum dots, including the structure and basic properties of the quantum dots, as well as methods for spin-to-charge conversion and coherent manipulation of spin qubits.
Article
Chemistry, Multidisciplinary
Jonathan Yue Huang, Wee Han Lim, Ross C. C. Leon, Chih Hwan Yang, Fay E. Hudson, Christopher C. Escott, Andre Saraiva, Andrew S. Dzurak, Arne Laucht
Summary: Recent studies on silicon spin qubits at temperatures above 1 K have shown promising results, suggesting that the cooling requirements for solid-state quantum computing can be relaxed. By utilizing tunneling between two quantized states in a double-island single-electron transistor, researchers have achieved a charge sensor with significantly improved signal-to-noise ratio compared to standard single-island single-electron transistors.
Article
Physics, Multidisciplinary
Ye-Qi Zhang, Xiao-Ting Ding, Jiao Sun, Tian-Hu Wang
Summary: We numerically study the quantum steering between two separated qubits trapped in a one-dimensional plasmonic waveguide. Our calculations show that steerability may exhibit a sudden disappearance and reappearance phenomenon, with time windows of no steerability but finite entanglement. The effects of plasmon wavenumber and the distance between the qubits on steerability are also examined. Furthermore, we demonstrate that quantum steerability can be tuned by adjusting the laser driving fields.
Review
Materials Science, Multidisciplinary
Conal E. Murray
Summary: The progress in quantum computing is driven by understanding qubit-state interactions with the environment, focusing on superconducting qubits and their mechanisms for relaxation and decoherence. Experimental techniques for assessing these mechanisms are highlighted, emphasizing the significance of dielectric loss and interactions with two-level systems. Future research should prioritize mitigating these effects for successful scaling of superconducting quantum computing.
MATERIALS SCIENCE & ENGINEERING R-REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Rico Friedrich, Mandi Ghorbani-Asl, Stefano Curtarolo, Arkady Krasheninnikov
Summary: This study outlines a method based on structural prototypes to filter a database and identify a group of binary and ternary candidate materials. The oxidation state of surface cations is found to regulate the exfoliation energy, providing a useful descriptor for synthesizing new 2D materials and offering guidance for experiments. These candidates exhibit appealing electronic, optical, and magnetic properties, making them particularly suitable for spintronics and other applications.
Article
Nanoscience & Nanotechnology
Hakon I. Rost, Ezequiel Tosi, Frode S. Strand, Anna Cecilie asland, Paolo Lacovig, Silvano Lizzit, Justin W. Wells
Summary: This study uses X-ray photoelectron diffraction to accurately determine the structural configuration of phosphorus dopants in subsurface silicon, which is of great interest as a silicon-based quantum computer platform. The growth of 6-layer systems with different doping levels is carefully studied and verified using X-ray photoelectron spectroscopy and low-energy electron diffraction. The results reveal that the subsurface dopants primarily substitute with silicon atoms from the host material, and no signs of carrier-inhibiting P-P dimerization are observed. This work not only settles a nearly decade-long debate about the dopant arrangement but also sheds light on the suitability of X-ray photoelectron diffraction for studying subsurface dopant structure.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Daniel Wines, Kamal Choudhary, Adam J. Biacchi, Kevin F. Garrity, Francesca Tavazza
Summary: High-throughput DFT calculations were employed to systematically search for conventional superconductors, including two-dimensional (2D) materials. Over 1000 2D materials in the JARVIS-DFT database were screened, and electron-phonon coupling calculations were performed to determine the superconducting transition temperature (Tc) for 165 materials. Among them, 34 dynamically stable structures with Tc above 5 K were identified, including previously unreported Mg2B4N2 (Tc = 21.8 K). Experimental measurements of selected layered superconductors were also conducted and discussed within the context of DFT results. The workflow outcomes provide a roadmap for future computational and experimental studies of new and emerging 2D superconductors.
Editorial Material
Chemistry, Physical
Christian Schonenberger
Summary: The exceptional quality of hexagonal boron nitride crystals allows for the creation of ultrathin dielectrics, enabling the development of ultrasmall capacitors with large capacitances. By utilizing these capacitors, the superconducting transmon qubit can be scaled down by orders of magnitude.
Article
Physics, Multidisciplinary
J. Koski, A. J. Landig, M. Russ, J. C. Abadillo-Uriel, P. Scarlino, B. Kratochwil, C. Reichl, W. Wegscheider, Guido Burkard, Mark Friesen, S. N. Coppersmith, A. Wallraff, K. Ensslin, T. Ihn
Article
Materials Science, Multidisciplinary
Maria J. Calderon, Elena Bascones
NPJ QUANTUM MATERIALS
(2020)
Article
Physics, Multidisciplinary
J. Corrigan, J. P. Dodson, H. Ekmel Ercan, J. C. Abadillo-Uriel, Brandur Thorgrimsson, T. J. Knapp, Nathan Holman, Thomas McJunkin, Samuel F. Neyens, E. R. MacQuarrie, Ryan H. Foote, L. F. Edge, Mark Friesen, S. N. Coppersmith, M. A. Eriksson
Summary: This study reports quantum control of eight different transitions in a silicon-based quantum dot, revealing a dense set of energy levels with characteristic spacing far smaller than the single-particle energy, which is argued to arise from Wigner-molecule physics.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Condensed Matter
Raquel Fernandez-Martin, Maria J. Calderon, Laura Fanfarillo, Belen Valenzuela
Summary: The analysis reveals that the orbital matching between the hole and electron pockets is the key parameter determining the momentum dependence and hierarchy of superconducting gaps in iron-based superconductors, rather than the common nesting scenario of Fermi surface matching.
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
Materials Science, Multidisciplinary
Pablo Rodriguez-Lopez, Dai-Nam Le, Maria J. Calderon, Elena Bascones, Lilia M. Woods
Summary: Twisted bilayered graphenes at magic angles exhibit long ranged periodicity and short ranged periodicity, providing a fertile ground for novel states arising from electronic correlations. The Casimir force can serve as a platform to study the macroscopic manifestations of quantum effects in these systems, and can be used to probe anisotropy in nematic states and identify topologically nontrivial phases in magic angle TBGs.
Article
Nanoscience & Nanotechnology
Cecile X. Yu, Simon Zihlmann, Jose C. Abadillo-Uriel, Vincent P. Michal, Nils Rambal, Heimanu Niebojewski, Thomas Bedecarrats, Maud Vinet, Etienne Dumur, Michele Filippone, Benoit Bertrand, Silvano De Franceschi, Yann-Michel Niquet, Romain Maurand
Summary: Strong intrinsic spin-orbit interaction in silicon enables strong spin-photon coupling with a frequency of 300 MHz, which is promising for scalable quantum information processing. Coupling semiconductor quantum dots to superconducting microwave resonators allows for fast non-demolition readout and on-chip connectivity. By leveraging the strong spin-orbit interaction in silicon, a spin-photon coupling rate of 330 MHz is achieved, surpassing the spin-photon decoherence rate and paving the way for circuit quantum electrodynamics with spins in semiconductor quantum dots.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Anushree Datta, M. J. Calderon, A. Camjayi, E. Bascones
Summary: In this study, the authors demonstrate that cascades in twisted bilayer graphene can be observed without the need for symmetry-breaking transitions, using a combination of dynamical mean-field theory and Hartree calculations.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
V. P. Michal, J. C. Abadillo-Uriel, S. Zihlmann, R. Maurand, Y. -M. Niquet, M. Filippone
Summary: We study a spin circuit-QED device, where a superconducting microwave resonator is connected to a single hole confined in a semiconductor quantum dot via capacitance. The gyromagnetic g matrix of the hole can be electrically modulated due to the strong spin-orbit coupling inherent in valence-band states. This modulation allows for coupling between the photons in the resonator and the hole spin. We demonstrate that the spin-photon interaction can be controlled through gate voltages and magnetic field orientation, and the character of the interaction can switch from fully transverse to fully longitudinal.
Article
Materials Science, Multidisciplinary
Esteban A. Rodriguez-Mena, Jose Carlos Abadillo-Uriel, Gaetan Veste, Biel Martinez, Jing Li, Benoit Sklenard, Yann-Michel Niquet
Summary: This study investigates the linear-in-momentum spin orbit interactions in the valence band of Ge/GeSi heterostructures using an atomistic tight-binding method. It finds that symmetry breaking at the Ge/GeSi interfaces results in a linear Dresselhaus-type interaction for heavy holes. Additionally, the Ge/GeSi interfaces also contribute to the in-plane gyromagnetic g factors of the holes and a small linear Rashba interaction is observed. These interactions can be utilized to manipulate hole spin.
Article
Materials Science, Multidisciplinary
Biel Martinez, Jose Carlos Abadillo-Uriel, Esteban A. Rodriguez-Mena, Yann-Michel Niquet
Summary: This study discusses the electrical manipulation of hole spins in semiconductor heterostructures subject to inhomogeneous vertical electric fields and/or in-plane ac electric fields. The lack of separability between the vertical and in-plane motions gives rise to an additional spin-orbit coupling mechanism that modulates the principal axes of the hole gyromagnetic g matrix. This mechanism enables spin manipulation even in symmetric dots when the magnetic field is applied in the heterostructure's plane.
Article
Materials Science, Multidisciplinary
M. J. Calderon, A. Camjayi, E. Bascones
Summary: Photocurrent experiments on aligned ABC trilayer graphene with hexagonal boron nitride (hBN) support the existence of a Mott insulating state at half filling. Using dynamical mean-field theory, it is shown that at experimentally relevant interaction values, significant spectral weight transfer occurs due to the alignment with hBN, impacting the electronic properties. The intramoire unit cell interactions promote an antiferromagnetic state close to the Mott transition.
Article
Materials Science, Multidisciplinary
Jose C. Abadillo-Uriel, Biel Martinez, Michele Filippone, Yann-Michel Niquet
Summary: In this study, the researchers examined the influence of Coulomb interactions on quantum dot systems, focusing on the impact of anisotropy of the confinement potential on the molecularization process. The results demonstrate an exponential suppression of the singlet-triplet gap with increasing anisotropy. The molecularization effects vary in different semiconductor materials, affecting Pauli spin blockade readout and reducing exchange interactions in two-qubit gates.
Article
Optics
J. C. Abadillo-Uriel, Cameron King, S. N. Coppersmith, Mark Friesen
Summary: Implementing two-qubit gates via strong coupling between quantum-dot qubits and a superconducting microwave cavity is challenging due to the need for coupling rates faster than decoherence rates. This study investigates protocols for two-qubit gates mediated by a microwave cavity, leading to the discovery of two different types of sweet spots in quantum-dot hybrid qubits with strong charge dipole moments. The results show that transverse driving yields faster gates, while longitudinal driving produces gates that are more resilient to photon decay. The numerous tuning knobs of quantum-dot hybrid qubits make them ideal candidates for strong coupling, with potential gate fidelities exceeding 99%.
Article
Physics, Multidisciplinary
B. Kratochwil, J. Koski, A. J. Landig, P. Scarlino, J. C. Abadillo-Uriel, C. Reichl, S. N. Coppersmith, W. Wegscheider, Mark Friesen, A. Wallraff, T. Ihn, K. Ensslin
Summary: The energy landscape of a single electron in a triple quantum dot can be tuned to create a third-order sweet spot for charge qubits. Strong coupling of the qubit to single photons is shown, but a local maximum of the linewidth is found near the proposed operating point due to noise contributions. The analysis provides insights into charge decoherence mechanisms.
PHYSICAL REVIEW RESEARCH
(2021)