Abatement of Ionizing Radiation for Superconducting Quantum Devices
B. Loer, P. M. Harrington, B. Archambault, E. Fuller, B. Pierson, I. Arnquist, K. Harouaka, T. D. Schlieder, D. K. Kim, A. J. Melville, B. M. Niedzielski, J. K.… 展开作者
B. Loer, P. M. Harrington, B. Archambault, E. Fuller, B. Pierson, I. Arnquist, K. Harouaka, T. D. Schlieder, D. K. Kim, A. J. Melville, B. M. Niedzielski, J. K. Yoder, K. Serniak, W. D. Oliver, J. L. Orrell, R. Bunker, B. A. VanDevender, M. Warner
备注：
36 pages, 9 figures, 9 tables including appendices. To be submitted to the Journal of Instrumentation
Ionizing radiation has been shown to reduce the performance of superconducting quantum circuits. In this report, we evaluate the expected contributions of different sources of ambient radioactivity for typical superconducting qubit experiment platforms. Our assessment of radioactivity inside a typical cryostat highlights the importance of selecting appropriate materials for the experiment components nearest to qubit devices, such as packaging and electrical interconnects. We present a shallow underground facility (30-meter water equivalent) to reduce the flux of cosmic rays and a lead shielded cryostat to abate the naturally occurring radiogenic gamma-ray flux in the laboratory environment. We predict that superconducting qubit devices operated in this facility could experience a reduced rate of correlated multi-qubit errors by a factor of approximately 20 relative to the rate in a typical above-ground, unshielded facility. Finally, we outline overall design improvements that would be required to further reduce the residual ionizing radiation rate, down to the limit of current generation direct detection dark matter experiments.
Accelerating Surface Radiation Content to Investigate the Impact of Radon Progeny on Superconducting Qubits
South Dakota School of Mines & Technology（南达科他矿业与技术学院）；Fermi National Accelerator Laboratory（费米国家加速器实验室）；Northwestern University（西北大学）；University of Southern California（南加州大学）
Qubit error bursts in superconducting quantum processors of Quantum Inspire: quasiparticle pumping and anomalous time dependence
QuTech and Kavli Institute of Nanoscience, Delft University of Technology（代尔夫特理工大学量子纳米科学卡弗里研究所和QuTech）；Netherlands Organisation for Applied Scientific Research (TNO)（荷兰应用科学研究组织（TNO））；Faculty of Electrical Engineering, Mathematics, and Computer Science, Delft University of Technology（代尔夫特理工大学电气、数学与计算机科学学院）
First Measurement of Correlated Charge Noise in Superconducting Qubits at an Underground Facility
Fermi National Accelerator Laboratory（费米国家加速器实验室）；Northwestern University（西北大学）；Wellesley College（韦尔斯利学院）；Illinois Institute of Technology（伊利诺伊理工学院）；Stanford University（斯坦福大学）；Kavli Institute for Particle Astrophysics and Cosmology（卡弗里粒子天体物理与宇宙学研究所）；SLAC National Accelerator Laboratory（斯坦福直线加速器中心）；Tufts University（塔夫茨大学）
A Cryogenic Muon Tagging System Based on Kinetic Inductance Detectors for Superconducting Quantum Processors
INFN – Sezione di Roma（意大利国家核物理研究所罗马分部）；Superconducting Quantum Materials and Systems Center (SQMS), Fermi National Accelerator Laboratory（费米国家加速器实验室超导量子材料与系统中心）；Consiglio Nazionale delle Ricerche, Istituto di Nanotecnologia（国家研究委员会纳米技术研究所）；Dipartimento di Fisica, Sapienza Università di Roma（罗马大学物理系）；Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel（格勒诺布尔阿尔卑斯大学、法国国家科学研究中心、格勒诺布尔理工学院内耳研究所）；Gran Sasso Science Institute（格兰萨索科学研究所）；INFN – Laboratori Nazionali del Gran Sasso（意大利国家核物理研究所格兰萨索国家实验室）
Real-Time Detection of Charge Jumps in Superconducting Qubits with a Convolutional Neural Network
Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA；Quantum Division, Fermi National Accelerator Laboratory, Batavia, IL 60510, USA；Department of Physics \& Astronomy, Northwestern University, Evanston, IL 60208, USA；Fermi National Accelerator Laboratory, Batavia, IL 60510, USA
Radiopurity material assays and radiation exposure projections for superconducting qubit measurements at SNOLAB
SNOLAB（斯诺拉布）；Laurentian University（劳伦森大学）；Chalmers University of Technology（查尔姆斯理工大学）；University of Toronto（多伦多大学）；University of Waterloo（滑铁卢大学）；Queen's University（女王大学）
Numerical Modeling of Quasiparticle-Induced Dissipation in Fluxonium Qubits
Lincoln Laboratory, Massachusetts Institute of Technology（林肯实验室，麻省理工学院）；Research Laboratory of Electronics, Massachusetts Institute of Technology（电子研究实验室，麻省理工学院）；Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology（电气工程和计算机科学系，麻省理工学院）
