Article
Quantum Science & Technology
Zhiyuan Li, Pei Liu, Peng Zhao, Zhenyu Mi, Huikai Xu, Xuehui Liang, Tang Su, Weijie Sun, Guangming Xue, Jing-Ning Zhang, Weiyang Liu, Yirong Jin, Haifeng Yu
Summary: In this work, we demonstrate the successful implementation of arbitrary single-qubit gates with near perfect fidelity in a transmon-qubit system. We achieve an average gate error below 10^(-4) by performing randomized benchmarking. By experimentally obtaining an error budget and reconstructing the process matrices for the single-qubit gates, we improve our understanding of the error sources and validate the simulation results. This demonstration extends the upper limit of single-qubit gate fidelity in a transmon-qubit system and represents a crucial step towards practical and reliable quantum computation in the future.
NPJ QUANTUM INFORMATION
(2023)
Article
Chemistry, Multidisciplinary
Ji-Hoon Kang, Junghee Ryu, Hoon Ryu
Summary: This study theoretically investigates charge stabilities and spin-based quantum bit operations in Si double quantum dot systems, exploring various aspects such as electron reservoir designs, electrostatic controls of quantum dot shapes, and spin qubit manipulation. The effects of DC control biases and geometric symmetries on the Rabi cycle of spin qubits are examined, with solid connections to experimental results being established. The research provides valuable insights into the engineering details of Si DQD structures, serving as a practical guideline for potential device designs.
Article
Multidisciplinary Sciences
Adam R. Mills, Charles R. Guinn, Michael J. Gullans, Anthony J. Sigillito, Mayer M. Feldman, Erik Nielsen, Jason R. Petta
Summary: Silicon spin qubits have the potential to become the dominant technology in the development of intermediate-scale quantum processors. However, there are still shortcomings in achieving high-fidelity state preparation and readout, as well as single- and two-qubit gate operations.
Article
Physics, Multidisciplinary
Kosuke Mizuno, Takaaki Takenaka, Imran Mahboob, Shiro Saito
Summary: In this study, the effect of various loss channels on the performance of logical gates on a bosonic qubit is investigated through numerical simulations. A gate error model is developed to predict experimentally achievable gate errors for bosonic qubits, providing insights into loss mechanisms and suggesting more efficient optimization algorithms to reduce gate errors.
NEW JOURNAL OF PHYSICS
(2023)
Article
Multidisciplinary Sciences
Keith Runge, M. Arif Hasan, Joshua A. Levine, Pierre A. Deymier
Summary: This study demonstrates the operation of a two-bit C-NOT quantum gate using classical qubit acoustic analogues. By tuning the frequency of an external driver, the manipulation of complex vectors in the Hilbert space of pairs of logical phi-bits is achieved, resulting in a systematic and predictable C-NOT gate.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
Kenneth Rudinger, Guilhem J. Ribeill, Luke C. G. Govia, Matthew Ware, Erik Nielsen, Kevin Young, Thomas A. Ohki, Robin Blume-Kohout, Timothy Proctor
Summary: Midcircuit measurements are an important primitive in quantum computing, especially for quantum error correction. In this study, we used quantum instrument linear gate set tomography (QILGST) technique to characterize dispersive measurements on a superconducting Transmon qubit and investigate the impact of residual cavity photon population on measurement error.
PHYSICAL REVIEW APPLIED
(2022)
Article
Quantum Science & Technology
Ben W. Reichardt
Summary: Researchers have extended quantum error-correction techniques to extract multiple syndromes simultaneously without requiring additional qubits. This method is fast, efficient, and adheres to geometric constraints, and in some cases allows error-correction without additional qubits.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Computer Science, Software Engineering
Alexander Margolin, Amnon Barak
Summary: This work presents tree-based fault-tolerant collective operations that integrate fault detection and recovery as an integral part of each operation. A comparison with other approaches and a simulator-based analysis of performance at scale are included in the article.
CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE
(2021)
Article
Chemistry, Multidisciplinary
Youn-A Min
Summary: The paper presents a modified pBFT blockchain consensus algorithm for more efficient data management in authorized nodes (such as governmental agencies). By simplifying the request management process and electing reliability-based consensus nodes, network communication costs are minimized and consensus accuracy is maximized. This modified algorithm ensures stability and speed in the consensus and verification process among various organizations, enabling efficient data management and value creation.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Theory & Methods
Chryssis Georgiou, Theophanis Hadjistasi, Nicolas Nicolaou, Alexander A. Schwarzmann
Summary: Communication latency plays a crucial role in the performance of message-passing systems. This study presents four algorithms that improve the efficiency of atomic read/write object algorithms by optimizing the read operation. The algorithms have no constraints on reader participation and the number of writers, and their correctness is rigorously argued. An empirical study demonstrates the superior read performance of these algorithms compared to relevant ones in certain settings.
JOURNAL OF PARALLEL AND DISTRIBUTED COMPUTING
(2022)
Article
Engineering, Electrical & Electronic
Keting Hu, Xiangyu Meng, Zhigang Liu, Junqi Xu, Guobin Lin, Laisheng Tong
Summary: This article proposes an open-switch fault diagnosis approach based on flux error for induction machine (IM) drives with predictive torque control (PTC) or predictive flux control (PFC). The method detects faults by computing and accumulating the error between predicted and estimated flux. It also introduces a fault-tolerant method that uses a three-phase four-switch (TPFS) inverter and a three-vector PFC method to reduce torque ripple. Hardware-in-the-loop (HIL) tests validate the effectiveness of these methods, showing faster diagnosis speed and improved performance of the three-vector PFC compared to conventional methods.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2022)
Article
Engineering, Electrical & Electronic
Keting Hu, Zhigang Liu, Ibrahim Adamu Tasiu, Tao Chen
Summary: This article presents a method for intelligent control of IGBT open-switch faults, achieving fault detection and localization through fault diagnosis and fault-tolerant strategies. Hardware-in-the-loop tests validate the effectiveness of the proposed methods.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2021)
Article
Automation & Control Systems
S. Ifqir, C. Combastel, A. Zolghadri, G. Alcalay, P. Goupil, S. Merlet
Summary: This paper addresses fault-tolerant multi-sensor data fusion for flight navigation during approach and landing of a civil jetliner. The proposed methodology utilizes a multi-layer hierarchical architecture to integrate heterogeneous information sources. The study focuses on three classical information sources and aims to meet navigation performance requirements using recently developed set-membership tools.
CONTROL ENGINEERING PRACTICE
(2022)
Article
Engineering, Electrical & Electronic
Yaser Rahmani, Saeed Rasouli Heikalabad, Mohammad Mosleh
Summary: This paper introduces a new solution to improve the fault tolerance of QCA circuits, by designing a new majority gate and using it in the design of multiplexers, resulting in significant improvements in fault tolerance and area requirement.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Yaser Rahmani, Saeed Rasouli Heikalabad, Mohammad Mosleh
Summary: Quantum-dot cellular automata (QCA) technology is a suitable alternative to CMOS circuits for designing and implementing logic circuits at the nano scale. Despite challenges such as cell loss, addition, rotation, and displacement, solutions have been proposed to handle these challenges, with three new structures introduced in this paper to increase fault tolerance in the three-input majority gate. Simulation results show improved fault tolerance and requirements for cell number and space.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Richard P. Muller, Robin Blume-Kohout
Article
Physics, Multidisciplinary
Juan P. Dehollain, Juha T. Muhonen, Robin Blume-Kohout, Kenneth M. Rudinger, John King Gamble, Erik Nielsen, Arne Laucht, Stephanie Simmons, Rachpon Kalra, Andrew S. Dzurak, Andrea Morello
NEW JOURNAL OF PHYSICS
(2016)
Article
Physics, Multidisciplinary
Christopher Ferrie, Robin Blume-Kohout
PHYSICAL REVIEW LETTERS
(2016)
Article
Physics, Multidisciplinary
Timothy Proctor, Kenneth Rudinger, Kevin Young, Mohan Sarovar, Robin Blume-Kohout
PHYSICAL REVIEW LETTERS
(2017)
Article
Physics, Multidisciplinary
Travis L. Scholten, Robin Blume-Kohout
NEW JOURNAL OF PHYSICS
(2018)
Article
Physics, Applied
Adam Frees, John King Gamble, Daniel R. Ward, Robin Blume-Kohout, M. A. Eriksson, Mark Friesen, S. N. Coppersmith
PHYSICAL REVIEW APPLIED
(2019)
Article
Physics, Multidisciplinary
Timothy J. Proctor, Arnaud Carignan-Dugas, Kenneth Rudinger, Erik Nielsen, Robin Blume-Kohout, Kevin Young
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
Kenneth Rudinger, Timothy Proctor, Dylan Langharst, Mohan Sarovar, Kevin Young, Robin Blume-Kohout
Article
Quantum Science & Technology
Erik Nielsen, Kenneth Rudinger, Timothy Proctor, Antonio Russo, Kevin Young, Robin Blume-Kohout
QUANTUM SCIENCE AND TECHNOLOGY
(2020)
Article
Multidisciplinary Sciences
Timothy Proctor, Melissa Revelle, Erik Nielsen, Kenneth Rudinger, Daniel Lobser, Peter Maunz, Robin Blume-Kohout, Kevin Young
NATURE COMMUNICATIONS
(2020)
Article
Quantum Science & Technology
Robin Blume-Kohout, Kevin Young
Article
Physics, Multidisciplinary
Erik Nielsen, Kenneth Rudinger, Timothy Proctor, Kevin Young, Robin Blume-Kohout
Summary: The technique presented in the study iteratively tests a nested sequence of models to find a good error model for a quantum processor, while keeping track of the best-fit model and its wildcard error at each step. The characterization of a processor is constituted by each best-fit model and a quantification of its unmodeled error. Moreover, the technique allows for comparison of quantum processor models with experimental data and among themselves.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Timothy Proctor, Kenneth Rudinger, Kevin Young, Erik Nielsen, Robin Blume-Kohout
Summary: Quantum computers exhibit considerable performance variations across different architectures, limited by hardware errors which make accurately predicting their capabilities difficult. Current benchmarks lack flexibility, but scalable benchmarks using circuit mirroring techniques can be constructed, revealing that standard error metrics are poor predictors of program success on hardware, and processors differ widely in sensitivity to program structure.
Article
Quantum Science & Technology
Robin Blume-Kohout, Marcus P. da Silva, Erik Nielsen, Timothy Proctor, Kenneth Rudinger, Mohan Sarovar, Kevin Young
Summary: This study presents a method for modeling errors in quantum logic gates, by transforming the process matrix of a gate into a more useful error generator. A variety of reduced models for gate errors can be built by combining elementary error generators.