Absence of Charge Offset Drift in a Transmon Qubit
Ecole Normale Supérieure de Lyon, CNRS, Laboratoire de Physique（里昂高等师范学院，法国国家科学研究中心，物理实验室）；Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile（智利大学理学院物理与数学系）；Institut Quantique and Département de Physique, Université de Sherbrooke（舍布鲁克大学量子研究所及物理系）
Superconducting quantum circuits are sensitive to their electrostatic environment: uncontrolled charges accumulating on the electrodes of a Josephson junction shift the energy levels of a qubit, perturbing its operation and restricting their design. This effect is captured by a single parameter - the charge offset - whose slow, unpredictable drift has proven difficult to eliminate in practice. Here, we report a tantalum-based transmon qubit in which the charge offset remains pinned at zero over nearly three months of measurements, including two thermal cycles, with no observable compromise to the qubit lifetime. This exceptional stability disappears in later cooldowns, indicating a fragile mechanism at play. We attribute it to the inductance of a thin superconducting layer inadvertently formed in parallel with the Josephson junction during fabrication. X-ray surface spectroscopy suggests this layer arises from an incomplete wet-etch of tantalum on sapphire. Deliberately engineering such a layer offers a route to eliminating charge-offset drift in superconducting circuits more broadly.
Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking
Beijing Academy of Quantum Information Sciences（北京量子信息科学研究院）；Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）；University of Chinese Academy of Sciences（中国科学院大学）；Peking University（北京大学）；Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）
Strongly anharmonic flux-tunable transmon based on InAs-Al 2D heterostructure
University of Maryland, College Park, MD, USA（美国马里兰大学帕克分校）；New York University, New York, NY, USA（美国纽约大学）；University of Wisconsin-Madison, Madison, WI, USA（美国威斯康星大学麦迪逊分校）；Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland（瑞士洛桑联邦理工学院）
Gate-dependent offset charge shifts and anharmonicity in gatemon qubits in the weak tunneling regime
Laboratory for Physical Sciences（物理科学实验室）；Department of Physics, University of Maryland（马里兰大学物理系）；Lincoln Laboratory, Massachusetts Institute of Technology（麻省理工学院林肯实验室）；Research Laboratory of Electronics, Massachusetts Institute of Technology（麻省理工学院电子研究实验室）
The Pound-Drever-Hall Method for Superconducting-Qubit Readout
University of Maryland, College Park（马里兰大学帕克分校）；Joint Quantum Institute, NIST/University of Maryland, College Park（联合量子研究所，美国国家标准与技术研究院/马里兰大学帕克分校）；DEVCOM Army Research Laboratory（DEVCOM陆军研究实验室）；Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park（马里兰量子材料中心，物理学系，马里兰大学帕克分校）
Mitigation of Measurement-Induced State Transitions via a Fast-Load and Fast-Clear Readout
Academia Sinica（中央研究院）；National Central University（中央大学）；National Cheng Kung University（国立成功大学）；National Taiwan University（国立台湾大学）；National Changhua University of Education（国立彰化师范大学）；Center for Quantum Science and Engineering, National Taiwan University（国立台湾大学量子科学与工程中心）；Physics Division, National Center for Theoretical Sciences（国家理论科学中心物理组）
Millisecond-Scale Calibration and Benchmarking of Superconducting Qubits
Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所量子设备中心）；NNF Quantum Computing Programme, Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所NNF量子计算项目）；Center for the Mathematics of Quantum Theory, MATH Department, University of Copenhagen（哥本哈根大学数学系量子理论数学中心）；Research Laboratory of Electronics, Massachusetts Institute of Technology（麻省理工学院电子研究实验室）；Institute of Experimental and Applied Physics, University of Regensburg（雷根斯堡大学实验与应用物理研究所）
Superconducting Qubit Gates Robust to Parameter Fluctuations
Technical University of Munich（慕尼黑工业大学）；Max Planck Institute of Quantum Optics（马克斯·普朗克量子光学研究所）；Munich Center for Quantum Science and Technology（慕尼黑量子科学与技术中心）；Saarland University（萨尔兰大学）
Coherent versus stochastic error injection on a repetition-code logical qubit in superconducting hardware
QuTech, Delft University of Technology（代尔夫特理工大学 QuTech）；Kavli Institute of Nanoscience, Delft University of Technology（代尔夫特理工大学 卡弗里纳米科学研究所）；Delft Institute of Applied Mathematics, Delft University of Technology（代尔夫特理工大学 应用数学研究所）；SRON Netherlands Institute for Space Research（荷兰空间研究研究所 SRON）；Netherlands Organisation for Applied Scientific Research (TNO)（荷兰应用科学研究组织 (TNO)）
