Article
Multidisciplinary Sciences
Daisuke Saida, Mutsuo Hidaka, Kouhei Miyake, Kentaro Imafuku, Yuki Yamanashi
Summary: By expressing the Hamiltonian using a circuit satisfiability problem, the applicability of quantum annealing to various problems can be improved. We investigate the characteristics of the NOR/NAND functions in a superconducting quantum circuit and present experimental results that are consistent with the theory.
SCIENTIFIC REPORTS
(2022)
Review
Nanoscience & Nanotechnology
Irfan Siddiqi
Summary: The review explores the major sources of decoherence in superconducting qubits and the trade-offs between simple and complex circuit designs. It also discusses the impact of materials optimization strategies on quantum computing.
NATURE REVIEWS MATERIALS
(2021)
Article
Physics, Multidisciplinary
Benzheng Yuan, Weilong Wang, Fudong Liu, Haoran He, Zheng Shan
Summary: This paper compares the LOM and EPR quantification methods in the design of superconducting quantum chips and summarizes the advantages and disadvantages of these two methods. The results show that the LOM method has more parameter outputs and more accurate qubit frequency calculation, providing reference significance for the design of superconducting quantum chips.
Article
Optics
Brian R. La Cour, Thomas W. Yudichak
Summary: Wheeler's delayed-choice experiment reveals the paradoxical nature of wave-particle duality, showing that quantum light's behavior depends on the experimenter's choice and can even recover interference in a seemingly retrocausal manner. Research suggests that using postselection and assuming the existence of a zero-point electromagnetic field can reproduce the observed quantum phenomena.
Article
Physics, Applied
Sultan Malik, Wentao Jiang, Felix M. Mayor, Takuma Makihara, Amir H. Safavi-Naeini
Summary: We have achieved strong coupling between gigahertz-frequency nanomechanical resonators and a frequency-tunable superconducting microwave resonator through a galvanically bonded flip-chip method. By tuning the microwave resonator using an external magnetic field, we have observed a series of hybridized microwave-mechanical modes and reported coupling strengths of approximately 15 MHz at cryogenic temperatures. The demonstrated multi-chip approach allows for flexible and rapid characterization and simplified fabrication, potentially enabling coupling between a variety of quantum systems.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Jin-Fu Chen, Ying Li, Hui Dong
Summary: The paper introduces a piecewise control scheme to measure the performed work in finite-time isothermal processes in quantum-heat-engine cycles, and demonstrates the feasibility of this method through direct simulation on a universal quantum computer.
Article
Physics, Multidisciplinary
Sai Pavan Chitta, Tianpu Zhao, Ziwen Huang, Ian Mondragon-Shem, Jens Koch
Summary: The accurate modeling of spectral properties is crucial for the development and improvement of new and existing superconducting circuits, which is necessary to achieve better performance in qubits. We present a work that utilizes symbolic computer algebra and numerical diagonalization routines to tackle various circuits, providing reliable and precise results.
NEW JOURNAL OF PHYSICS
(2022)
Article
Quantum Science & Technology
Petar Jurcevic, Ali Javadi-Abhari, Lev S. Bishop, Isaac Lauer, Daniela F. Bogorin, Markus Brink, Lauren Capelluto, Oktay Gunluk, Toshinari Itoko, Naoki Kanazawa, Abhinav Kandala, George A. Keefe, Kevin Krsulich, William Landers, Eric P. Lewandowski, Douglas T. McClure, Giacomo Nannicini, Adinath Narasgond, Hasan M. Nayfeh, Emily Pritchett, Mary Beth Rothwell, Srikanth Srinivasan, Neereja Sundaresan, Cindy Wang, Ken X. Wei, Christopher J. Wood, Jeng-Bang Yau, Eric J. Zhang, Oliver E. Dial, Jerry M. Chow, Jay M. Gambetta
Summary: This study improved the quality of quantum circuits on superconducting quantum computing systems by combining various methods, highlighting the importance of increasing coherence, control gate fidelities, measurement fidelities, and smarter software to achieve larger quantum systems in the future.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Gen-Sheng Ye, Biao Xu, Feng-Yuan Kuang, Hao-Xiang Liu, Shuai Shi, Yiqiu Ma, Lin Li
Summary: In this work, the delayed choice gedanken-experiment proposed by J A Wheeler is conducted and tested using a new regime based on Rydberg atoms. The experimental results confirm the nontrivial time order inversion in this quantum system and support the Copenhagen interpretation regarding the physical reality of quantum states.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2022)
Article
Physics, Applied
T. Yoshioka, J. S. Tsai
Summary: This study demonstrates a method for high-speed initialization of qubits in quantum computation by utilizing single-photon-assisted tunneling and drive pulses, providing a new solution for the challenge of qubit initialization in quantum computation.
APPLIED PHYSICS LETTERS
(2021)
Article
Quantum Science & Technology
H. Fosbinder-Elkins, Y. Kim, J. Dargert, M. Harkness, A. A. Geraci, E. Levenson-Falk, S. Mumford, A. Fang, A. Kapitulnik, A. Matlashov, D. Kim, Y. Shin, Y. K. Semertzidis, Y-H Lee, N. Aggarwal, C. Lohmeyer, A. Reid, J. Shortino, I Lee, J. C. Long, C-Y Liu, W. Snow
Summary: The QCD axion is proposed to explain the strong-CP problem and dark matter in particle physics. The ARIADNE experiment aims to detect the QCD axion by sensing its coupling to spin. It requires tight control of the experiment's magnetic environment to achieve its desired sensitivity.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Weijian Chen, Maryam Abbasi, Byung Ha, Serra Erdamar, Yogesh N. Joglekar, Kater W. Murch
Summary: We observe exceptional points of the Liouvillian superoperator in open quantum systems interacting with an environment, which are associated with critical dynamics as the system approaches steady state. By dynamically tuning the Liouvillian superoperators in real time, we achieve nonHermiticity-induced chiral state transfer.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Peng Xu, Ran Zhang, Sheng-Mei Zhao
Summary: High-dimensional quantum systems, such as qutrits, offer a larger state space to improve the efficiency of quantum computation. We demonstrate a high-fidelity iSWAP-like gate operation on a frequency-tunable superconducting qutrits system. Through designing the frequency pulse profile and optimizing the parameter values, the gate error can be suppressed below 1.5 x 10(-3). The presented approach also provides a good platform for coupling multiple qutrits together for quantum information processing.
Article
Chemistry, Multidisciplinary
Xiangyu Bi, Feifan Tian, Ganyu Chen, Zeya Li, Feng Qin, Yang-Yang Lv, Junwei Huang, Caiyu Qiu, Lingyi Ao, Yanbin Chen, Genda Gu, Yanfeng Chen, Hongtao Yuan
Summary: Superconducting quantum interferometer device (SQUID) plays a crucial role in understanding electromagnetic properties and emergent phenomena in quantum materials. By using a specially designed superconducting nano-hole array, it is demonstrated that the contactless detection of magnetic properties and quantized vortices in micro-sized superconducting nanoflakes can be achieved. This new approach provides a quantitative evaluation of the density of pinning centers of the quantized vortices on such micro-sized superconducting samples, which is not accessible with conventional SQUID detection.
ADVANCED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
R. F. Silva, G. R. F. Q. Mafra, G. G. Sotelo, M. Z. Fortes, F. Trillaud, D. Guillen
Summary: Electric power systems may experience high asymmetry fault currents when generators are close to large motors and loads. These fault currents may exhibit Delayed Current Zeros (DCZ) depending on the fault inception instants. This study demonstrates that resistive superconducting fault current limiters (r-SFCL) can address the DCZ issue and reduce the magnitude of fault currents.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Physics, Multidisciplinary
Zhi-Xuan Yang, Yi-Meng Zhang, Yu-Xuan Zhou, Li-Bo Zhang, Fei Yan, Song Liu, Yuan Xu, Jian Li
Summary: Experiments carried out using the superconducting circuit quantum electrodynamics architecture demonstrate phase-sensitive Landau-Zener-Stuckelberg interference phenomena, confirming LZS-induced Rabi-like oscillations and phase-dependent steady-state populations.
Article
Physics, Applied
Martina Esposito, Arpit Ranadive, Luca Planat, Nicolas Roch
Summary: Quantum-limited microwave parametric amplifiers are crucial for emerging quantum technologies and applications requiring successful readout of weak microwave signals with minimal noise. This perspective focuses on traveling wave parametric amplifiers, discussing recent achievements and current challenges. Future research directions may explore these devices as platforms for multi-mode entanglement generation and single photon detectors.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Sai Li, Bao-Jie Liu, Zhongchu Ni, Libo Zhang, Zheng-Yuan Xue, Jian Li, Fei Yan, Yuanzhen Chen, Song Liu, Man-Hong Yung, Yuan Xu, Dapeng Yu
Summary: Geometric phases accompanying adiabatic quantum evolutions can be used to construct robust quantum control, but nonadiabatic geometric gates are not necessarily more robust than dynamical ones. Experimental investigation shows that conventional nonadiabatic holonomic quantum computation (NHQC) schemes may not guarantee the expected robustness, whereas introducing different constraints for gate construction can achieve enhanced robustness. The study demonstrates high-fidelity holonomic gates with reduced errors and accumulated dynamical phase, and presents a protocol for constructing two-qubit NHQC gates with enhanced robustness.
PHYSICAL REVIEW APPLIED
(2021)
Article
Multidisciplinary Sciences
Arpit Ranadive, Martina Esposito, Luca Planat, Edgar Bonet, Cecile Naud, Olivier Buisson, Wiebke Guichard, Nicolas Roch
Summary: In this article, a versatile Josephson transmission line with strong third order nonlinearity is reported, which can be tuned from positive to negative values and suppresses second order nonlinearity. The reversed Kerr phase-matching mechanism in traveling wave parametric amplification is demonstrated, offering better performance and wider applications compared to traditional methods.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Giacomo Catto, Wei Liu, Suman Kundu, Valtteri Lahtinen, Visa Vesterinen, Mikko Mottonen
Summary: The study investigates the change in the characteristics of a superconductor using a coplanar-waveguide resonator as a tank circuit, and relates measurements to the reactance and resistance of the material. The observed behavior in the superconductor is mainly caused by the heat generated by leakage current.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Zhongchu Ni, Sai Li, Libo Zhang, Ji Chu, Jingjing Niu, Tongxing Yan, Xiuhao Deng, Ling Hu, Jian Li, Youpeng Zhong, Song Liu, Fei Yan, Yuan Xu, Dapeng Yu
Summary: Researchers propose and demonstrate a method for eliminating unwanted ZZ interaction in superconducting qubit systems. By applying a weak microwave drive, ZZ interaction can be noninvasively cancelled, improving the quality of quantum operations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
W. Wang, Z-J Chen, X. Liu, W. Cai, Y. Ma, X. Mu, X. Pan, Z. Hua, L. Hu, Y. Xu, H. Wang, Y. P. Song, X-B Zou, C-L Zou, L. Sun
Summary: The authors demonstrate how approximate quantum error correction helps overcome decoherence due to noise when measuring the excitation population of a receiver mode in a superconducting circuit. The experimental results show the potential of a quantum-enhanced sensing scheme based on a bosonic probe in practical applications.
NATURE COMMUNICATIONS
(2022)
Article
Quantum Science & Technology
Chang-Kang Hu, Jiawei Qiu, Paulo J. P. Souza, Jiahao Yuan, Yuxuan Zhou, Libo Zhang, Ji Chu, Xianchuang Pan, Ling Hu, Jian Li, Yuan Xu, Youpeng Zhong, Song Liu, Fei Yan, Dian Tan, R. Bachelard, C. J. Villas-Boas, Alan C. Santos, Dapeng Yu
Summary: In this study, we experimentally verified a quantum battery based on superconducting qutrit, which achieves stable and powerful charging processes by exploring dark and bright states. The battery exhibits a self-discharge mechanism similar to that of a supercapacitor. These results pave the way for proposing new superconducting circuits capable of storing extractable work.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Ji Chu, Xiaoyu He, Yuxuan Zhou, Jiahao Yuan, Libo Zhang, Qihao Guo, Yongju Hai, Zhikun Han, Chang-Kang Hu, Wenhui Huang, Hao Jia, Dawei Jiao, Sai Li, Yang Liu, Zhongchu Ni, Lifu Nie, Xianchuang Pan, Jiawei Qiu, Weiwei Wei, Wuerkaixi Nuerbolati, Zusheng Yang, Jiajian Zhang, Zhida Zhang, Wanjing Zou, Yuanzhen Chen, Xiaowei Deng, Xiuhao Deng, Ling Hu, Jian Li, Song Liu, Yao Lu, Jingjing Niu, Dian Tan, Yuan Xu, Tongxing Yan, Youpeng Zhong, Fei Yan, Xiaoming Sun, Dapeng Yu
Summary: Translating high-level global operations into hardware-native logic gates, known as quantum compiling, is crucial for implementing quantum algorithms on realistic devices. By optimizing compilation and demonstrating low-depth synthesis of quantum logic gates on a superconducting quantum processor, the efficiency of near-term quantum computers can be substantially improved, enabling more meaningful quantum applications on noisy devices.
Article
Multidisciplinary Sciences
Eric Hyyppa, Suman Kundu, Chun Fai Chan, Andras Gunyho, Juho Hotari, David Janzso, Kristinn Juliusson, Olavi Kiuru, Janne Kotilahti, Alessandro Landra, Wei Liu, Fabian Marxer, Akseli Makinen, Jean-Luc Orgiazzi, Mario Palma, Mykhailo Savytskyi, Francesca Tosto, Jani Tuorila, Vasilii Vadimov, Tianyi Li, Caspar Ockeloen-Korppi, Johannes Heinsoo, Kuan Yen Tan, Juha Hassel, Mikko Mottonen
Summary: This article introduces a new superconducting qubit design called unimon, which combines high anharmonicity and protection against low-frequency noise. Experimental results show that unimon can achieve high fidelity under certain parameters, and improvements in materials and design may further enhance performance.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Zhongchu Ni, Sai Li, Xiaowei Deng, Yanyan Cai, Libo Zhang, Weiting Wang, Zhen-Biao Yang, Haifeng Yu, Fei Yan, Song Liu, Chang-Ling Zou, Luyan Sun, Shi-Biao Zheng, Yuan Xu, Dapeng Yu
Summary: Quantum error correction (QEC) protects logical qubits by using a large Hilbert space with redundancy to detect and correct errors in real time. In this study, a QEC procedure was demonstrated in a circuit quantum electrodynamics architecture, where a logical qubit was encoded in photon-number states of a microwave cavity and coupled to an auxiliary superconducting qubit. By applying a tailored frequency comb pulse, error syndrome was extracted and error correction was performed, exceeding the break-even point by about 16% lifetime enhancement. This work illustrates the potential of hardware-efficient discrete-variable encodings for fault-tolerant quantum computation.
Article
Physics, Applied
David Rodriguez Perez, Paul Varosy, Ziqian Li, Tanay Roy, Eliot Kapit, David Schuster
Summary: We propose a simple and widely applicable framework for designing error-divisible two-qubit gates, which can reduce errors in fractional rotations compared to full entangling gates. In noisy intermediate-scale quantum (NISQ) algorithms, error propagation at high circuit depths, especially in two-qubit gates, limits performance. This work introduces criteria, waveforms, and protocols for constructing continuous gate sets with reduced leakage and dynamic ZZ errors using superconducting qubits and tunable couplers. Implementing our error-divisible gate protocols at scale could significantly improve NISQ algorithm performance.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Electrical & Electronic
Jingjing Niu, Libo Zhang, Yang Liu, Jiawei Qiu, Wenhui Huang, Jiaxiang Huang, Hao Jia, Jiawei Liu, Ziyu Tao, Weiwei Wei, Yuxuan Zhou, Wanjing Zou, Yuanzhen Chen, Xiaowei Deng, Xiuhao Deng, Changkang Hu, Ling Hu, Jian Li, Dian Tan, Yuan Xu, Fei Yan, Tongxing Yan, Song Liu, Youpeng Zhong, Andrew N. Cleland, Dapeng Yu
Summary: Low-loss superconducting aluminium cables and on-chip impedance transformers are used to connect qubit modules and create high-fidelity intermodule state transfer in superconducting quantum computing networks. Scaling is a key challenge in superconducting quantum computing, which can be addressed by building modular systems with suitable interconnects. The reported low-loss interconnects based on pure aluminium coaxial cables and on-chip impedance transformers demonstrate comparable performance with transmon qubits and enable intermodule quantum state transfer with high fidelity.
NATURE ELECTRONICS
(2023)
Proceedings Paper
Computer Science, Hardware & Architecture
Andrew Litteken, Lennart Maximilian Seifert, Jason D. Chadwick, Natalia Nottingham, Tanay Roy, Ziqian Li, David Schuster, Frederic T. Chong, Jonathan M. Baker
Summary: Superconducting quantum devices are a leading technology for quantum computation, but they face challenges such as gate errors, coherence errors, and lack of connectivity. This study explores the use of higher energy levels to improve fidelity and demonstrates experimental implementations of several three-qubit gates.
PROCEEDINGS OF THE 2023 THE 50TH ANNUAL INTERNATIONAL SYMPOSIUM ON COMPUTER ARCHITECTURE, ISCA 2023
(2023)
Article
Physics, Multidisciplinary
Tanay Roy, Liang Jiang, David Schuster
Summary: Grover's quantum search algorithm provides a quadratic quantum advantage over classical algorithms for unstructured search problems. We present a modified version that returns the correct result with certainty without user control over the quantum search oracle. The visualization using the Bloch sphere enhances geometric intuition.
PHYSICAL REVIEW RESEARCH
(2022)
